The safety of the driver and passengers while driving depends on the condition and serviceability of the brake system. If there are any deviations or defects in its operation, then the effectiveness of the braking process will definitely decrease. For this reason, the driver needs to regularly check the quality of operation of its components. One of the most important elements of this system are brake calipers.
Possible reasons
To repair a fault, it must be found. Therefore, first we will look at the main causes of caliper knocking:
- Worn pads. Actually, it is not the caliper that is knocking, but the pads;
- The guides were taken out, as a result the caliper moves along them, while it knocks;
- The bolts holding the caliper have come loose.
Each of these problems has its own methods and repair methods. Let's look at them in more detail.
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The mount has come loose
This happens, but quite rarely. A common reason is traveling on poor quality roads. Vibration can cause bolts to become loose and unscrewed. Usually, this happens soon after a repair affecting the caliper. In this case, you or the master simply did not tighten the bolts. For prevention, always pull fasteners with a certain torque when assembling.
This will save you from problems. To eliminate this knocking noise, simply tighten the bolts. If one of them is lost, make sure it is not broken off and screw on a new one. The broken bolt will have to be drilled out.
Conclusion
. There are quite a large number of different mechanisms near the wheels. They periodically fail. Therefore, the question of what to do if the calipers are knocking is not uncommon. In many cases, this is a design feature that will be quite problematic to eliminate. But it is still quite possible.
Looking for the root of the problem
So, what causes such a characteristic ringing? The reason lies in insufficient pressure of the pads to the discs. As a result, a gap appears between them. On bumps, the pads vibrate and involuntarily come into contact with the surface of the disc.
This is what causes the haunting sound. What is noteworthy is that from the street it looks more like a ringing sound. And dull blows are felt inside. Sometimes this indicates a problem with the shock absorbers or ball joint. But don’t rush things and sort out the suspension. Perhaps your brake calipers are just rattling.
Nature of origin of the defect
The knocking sound of the caliper comes from a loose fit of the guides in the brake caliper sockets. The weakened clearance allows the caliper to move relative to the bracket, which is why the knocking occurs. It is considered acceptable for a malfunction to occur after an impressive mileage, as a result of natural wear and tear on the seats for the guide pins. Other manifestations are considered to be a deviation from the norm. This can be caused either by a factory defect or by untimely maintenance of the guides. Yes, poor design of brake calipers is quite common on modern cars. One example is the front-wheel drive Lada Vesta with rattling calipers.
Pads
Often, a metallic grinding sound is added to the knocking. This happens when the lining on the block has been removed completely. The knocking does not come from the caliper itself, but from the pads. The repair consists of replacing the pads. If you ignore the problem, your braking performance will be significantly reduced. But that's not all.
Having worn down to iron, the pads actively wear down the brake disc. A hundred kilometers in this mode and it will simply “cut off”. And you will have to buy a new disk at the store. It can also easily push out the working cylinders. This is fraught with jamming. The most common problem in this case is brake fluid leakage.
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- There are not enough funds on the plastic card.
In order to solve these problems, you need to call or write to the technical support of the bank where you are served. Bank specialists will help you resolve them and make payments.
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What to do if the pads rattle in the caliper immediately after replacement?
In this case, the culprit of the problem is a disk that is too thin. Typically its service life ranges from 120 to 200 thousand kilometers. With significant wear, neither lubricant nor additional plates will help restore the previous gap. There is only one way out of the situation - replacing the brake disc with a new one.
Some produce grooving of this element. But it is worth remembering that such an operation is performed only if the part is sufficiently thick. In our case, this operation can also cause harm.
If the calipers rattle, what should I do? If you install a new disc and pads, the problem should be solved. But if it remains, you can try replacing the clamping bracket.
Plate
Many manufacturers install special anti-squeak plates from the factory. They follow the contours of the block and are up to one millimeter thick. Many people do not see the point in installing these elements. But they have an effect. If the spring is not able to properly press the pads, this pad partially compensates for this gap. If the calipers rattle, what should I do? It is necessary to inspect the brake mechanism and check for the presence of an anti-squeak plate.
Note! Even on a fully functional car, there should be a small gap between the working surface of the disc and the friction material of the pad. But it is so insignificant that the sound from the contact of parts is not reproduced. If the brake elements are fairly worn out, you should not add several plates at a time. This may interfere with the braking system, and the effect will be disappointing.
Guides
The caliper is constantly subject to quite heavy loads. Therefore, problems with them are not uncommon. And on some Chevrolet models, this is a generic disease that appears after 20,000-30,000 kilometers. There are several ways to fix this problem:
- Replacing guides. This method does not always help. We buy a set of new guides and install it. If everything is in order, then the problem will disappear. But, she will return after some mileage. When the knocking occurs again depends on the characteristics of your vehicle. In some cases, the knocking noise is caused by wear on the guide seats. Dealing with such a malfunction is much more difficult. In this case, special rubber bands are installed on the pins. To do this, you will have to purchase special reinforced guides. But this pleasure is not cheap. Each set contains only 1 elastic band. Accordingly, one wheel will require from 2 to 4 sets. But, you will forget about the knock for quite a long time;
- There is a special lubricant for calipers. In general, this is a preventive measure. But, in some cases it helps to get rid of knocking. To use, pull the guide out of its seat and lubricate it thickly with lubricant. After that, we place part of the lubricant in the socket. We insert the pin into place and secure it. Depending on the degree of wear and the quality of the lubricant itself, one treatment should be enough for 500-10,000 kilometers. This lubricant is usually sold in small bags per guide;
- There is also a rather radical way to solve the problem. This is the addition of a spacer spring. To do this, you will have to drill holes in the caliper and brake cylinder block. After which, the parts are tightened using a spring. Suitable from VAZ drum brake repair kit.
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The solution couldn't have been simpler
I spent several hours on auto forums, where many advised replacing the caliper guide with rubber and making a bracket with a spring on them. In general, I began to think that there was no simple solution. However, I read somewhere that there is a miraculous American high-temperature lubricant for calipers and supposedly, not only does it not wear out for a very long time, but it also completely eliminates the nasty sound. It's called Permatex Ultra Disk Brake Caliper Lube.
Well, it is said, so it is said. I called all the auto stores and found it. It turned out that the bag costs 50 rubles. It contains four grams, enough for exactly one caliper.
I went and picked it up, jacked up the car right at the entrance, took off the wheel, took a rag, and wrapped it around a sushi stick. Using the resulting tool, I first cleaned all the protective rubber bands from the inside, then the guide wells themselves. After which I put rubber bands on the guides, filled them with grease, lubricated them themselves (important) and sent them into the wells.
After I assembled it, I basically forgot about the sounds from the brake mechanisms; this year I checked it while climbing. The grease looks the same as when I put it in.
In general, I recommend that you get rid of knocking in the calipers using the method described above.
Inspection of calipers
In 40 percent of cases, the front caliper rattles due to dry lubricant. Many car owners do not know that this part requires periodic maintenance. How often should you do it? Experts give the answer - lubrication is carried out every time the pads are replaced. The service life of the latter can range from 20 to 60 thousand kilometers, depending on the location (front or rear), as well as the driver’s driving style.
How to perform an audit? First you need to find a quality lubricant. It must be specialized - specifically for guides. Reviews do not recommend using grease for hubs, as well as copper and ceramic analogues. They dry out quickly and are not suitable for use in this location. A popular manufacturer of specialized lubricants for calipers is Liquid Moly. Typically this product is sold in vacuum bags. One is enough for two guides. The lubricant does not lose its properties at temperatures up to 200 degrees Celsius.
Note! If the piston boot is damaged, it must be replaced immediately. Otherwise, the rear and front calipers will rattle constantly.
The same work must be done on the adjacent brake mechanism. In order not to run to the store when you discover a damaged boot, it is recommended to purchase a repair kit in advance (in extreme cases, it will remain “in reserve”).
How to eliminate the reason why the calipers rattle?
If one of the signs of wear on the guides is detected, in order to prevent the caliper from jamming, it is necessary to disassemble the caliper and replace the worn pins and boots, adding the required amount of lubricant. Therefore, it is better to contact a car service center, because... This problem cannot be resolved on site.
For guide pins, a special synthetic high-temperature silicone-based lubricant is required. IMPORTANT! Lithol and copper-graphite lubricants are absolutely not suitable for this, as they corrode the rubber boots and dry out over time, which leads to the caliper jamming.
To less often encounter the consequences of untimely replacement of caliper guide pin boots, replace them with polyurethane ones. CS20 polyurethane boots are resistant to any lubricants, are not afraid of mechanical damage and last much longer than rubber ones. With the help of polyurethane boots, you can extend the life of the caliper, thereby ensuring safe braking and protecting the mechanism from jamming.
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Many people are faced with a fairly common problem: caliper rattling. The main symptom is a metallic rattle, which disappears if you lightly press the brake and mainly appears on cobblestones or similar roads and is also clearly audible when you get into holes. The sound itself can be either sonorous or more dull. The main reason is the broken holes for the guides due to untimely maintenance. Although once a year it is necessary to check the presence of grease on the caliper guides, as well as the condition of the rubber boots.
How to eliminate knocking calipers
If the knocking has just appeared recently, an inspection of the calipers may help, that is, lubricating the guides with high-quality lubricant and checking the boots.
It is important to use high-quality lubricant special for guides. It is not recommended to use copper, ceramic or hub grease. These types of lubricants will jam the caliper guides under certain conditions. The optimal lubricant for guides is SLIPKOTE 211 DBC or similar. If the necessary lubricant is not available, as a last resort, use blue lubricant for the hubs, up to 170 degrees; without sudden braking, such lubricant will work normally. In principle, there were no problems with it on the Starex bead; the anthers did not swell.
How to choose guide pin boots for the caliper.
The size of the boot must correspond to the parameters of the guide pin. It is not recommended to purchase boots of a smaller or larger size, since the main purpose of the boot is to protect the moving mechanism and retain a sufficient amount of lubricant. CS20 boots are manufactured to exact factory dimensions and are suitable for domestic cars of the following brands:
• LADA Kalina 1 and 2 / Granta / Priora; • VAZ 2108-099 / 2110-12 / 2113-15; • GAZelle 3302 and Sobol 2217; • Volga 31029 / 3102 / 3110 / 31105.
If the diameter and length of the boot match, then they can be installed on foreign cars.
• 2108-3501019 (for VAZ cars); • 3105-3501216 (for GAZ vehicles).
How to get rid of knocking calipers on front-wheel drive LADAs
Owners of cars of different brands encounter extraneous noise from brake calipers, and LADA is no exception. Most often, drivers of Grant/Kalina, Largus and Vesta encounter this problem. The malfunction is less common on Priora and XRAY. Let's consider what can be done in this case.
To make sure that extraneous noise while driving comes specifically from the brake mechanisms, you need to rock the caliper from side to side (you can do this without removing the wheel):
Front wheel brake diagram:
1 – wheel cylinder; 2 – fitting for bleeding the brake drive; 3 – sealing ring; 4 – piston; 5 – protective cap; 6 – retaining ring; 7 – caliper; 8 – pad guide; 9 – brake pads; 10 – protective cover; 11 – guide pin; 12 – guide pin fastening bolt; 13 – brake hose; 14 – bolt securing the cylinder to the caliper.
The sounds may resemble metallic knocking, rumble, clanging, strumming, etc. The first step is to contact your dealer with the problem. As far as we know, there are no AvtoVAZ regulations in this case. If the official representative refuses, you can try to get rid of the knocking of the calipers yourself using one of the suggested methods:
1. Fill the guide pins with refractory grease (it’s called “Grease for calipers”).
2. Replace the caliper guide pins with new ones.
3. Make a small groove in the guide fingers (using a lathe), onto which we put a ring made of oil-gasoline-resistant and heat-resistant rubber.
4. Make new guides (using a lathe), which will be slightly larger in diameter than the old ones.
5. Replace brake pads. It is better to choose ones that have a special rubberized coating on their outer side (survey for Vesta, Largus, Granta/Kalina/Priora).
6. Tighten the brake pad guide using a plastic clamp or spring (can be done without removing the wheel).
7. Fold the top of the noise reduction plate (number 4) down. This will get rid of the rattling of the calipers on Vesta:
This method is also shown in the video:
Information letter No. 19-18: When contacting owners of Lada Vesta cars, the effect of “noise from the brakes of the front wheels” emitted when driving on roads with broken surfaces is functional and cannot be eliminated under the warranty obligations of AvtoVAZ PJSC.
Have you encountered rattling noise from the calipers on your LADA? Did the official dealer help in this situation or did you have to fix it yourself? Let us remind you that knocking noises in the front part of the car can come from the suspension (for example, on Vesta from the anti-roll bar) or from the engine mount.
Brakes (discs, pads, sensors) Lada Vesta
Products from the Dustershop77 range on the topic of the article:
Name | Manufacturer | Price | Availability | Add to cart |
410607115R | Front brake pads original 440603905R / 410605961R / 410607115R / 410600379R for 280mm disc | Original | 4500 / 3900 rub. Discount: 3700 rub. | 2 |
410608481R | Front brake pads Duster, Vesta original 410608481R for disc 260-269mm | Original | 3000 / 2300 rub. Discount: 2100 rub. | 2 |
DC441-GDB3332 | Front brake pads 1.6 and 2.0, TRW GDB3332 (410608481R for 260-269mm disc) | Analogue | 3000 / 2500 rub. Discount: 2200 rub. | 2 |
DC1399 | Hex key for replacing pads | Analogue | 200 / 150 rub. Discount: 100 rub. | 6 |
DC444-23973.175.1 | Front brake pads for disc 260-269mm ZIMMERMANN 23973.175.1 (410608481R) | Analogue | 4000 / 3500 rub. Discount: 3100 rub. | 1 |
DC510-7701205518 | Set of springs for rear brake pads Duster 4x2 original 7701205518 | Original | 3000 / 2700 rub. Discount: 2500 rub. | 1 |
DC1149-8200276361 | Renault brake pedal sensor original 8200276361 | Original | 700 / 550 rub. Discount: 500 rub. | 2 |
DC396-MR0276361 | Brake pedal sensor MANOVER MR0276361 (8200276361) | Analogue | 500 / 400 rub. Discount: 350 rub. | 1 |
DC627-ASAM32116 | Brake master cylinder with ESP ASAM 32116 (460119952R) | ASAM | 2500 / 2200 rub. Discount: 1800 rub. | 1 |
DC1657-479703074R | ABS ring Lada Vesta rear original 479703074R | 2000 / 1600 rub. Discount: 1400 rub. | 2 | |
DC912-QZ-120-0410 | Front pad mounting kit (plates) (D259mm ventilated) Quartz QZ-120-0410 (kit) | Analogue | 1300 / 1000 rub. Discount: 700 rub. | 2 |
DC1651-24165 | Front brake discs Lada Vesta, XRAY FEBI (260mm - 2 pcs.) | Analogue | 4900 / 3600 rub. Discount: 3300 rub. | 1 |
DC1655-11196350208900 | Rear pads Lada Vesta (for disc brakes) original 11196350208900 | Original | 2800 / 2500 rub. Discount: 2200 rub. | 1 |
DC1652-8450031131 | Rear brake disc Lada Vesta, XRAY original LADA 8450031131 (260mm - 1 piece) | Original | 2700 / 2300 rub. Discount: 2000 rub. | 2 |
DC1656-440609415R | Rear pads Lada Vesta (for drum brakes) original 440609415R | Original | 2900 / 3200 rub. Discount: 2800 rub. | 1 |
DC1656-BS-5717 | Rear pads Lada Vesta (for drum brakes) LYNX BS-5717 | Analogue | 1900 / 1500 rub. Discount: 1200 rub. | 1 |
DC1650-8450031577 | Front brake disc Lada Vesta, XRAY original LADA 8450031577 (260mm - 1 pc.) | Original | 2900 / 2500 rub. Discount: 2400 rub. | 2 |
DC1689 | ABS ring Lada Vesta rear analogue 479703074R | 1500 / 1000 rub. Discount: 800 rub. | ||
NF0010851 / 410608481R | Front brake pads NF0010851 Duster, Vesta analogue 410608481R for disc 260-269mm | 750 Discount: 750 rub. | ||
000050BSX / 440603905R | Front brake pads Duster (2.0 doors) Stellox 000050BSX non-original, analogue 440603905R for 280mm disc | STELLOX | 1200 Discount: 1200 rub. |
Sergey 06/23/2020 at 09:52 pm#Reply
you can't do that. With this plate you clamp the caliper, which should move horizontally when you press the brake, pressing the outer pad. As a result, you will have one pad slowing down because the outer one is clamped by the plate. RESULT: THE CALIPER WILL NOT RATTLE, BUT THE BRAKE WILL BE BRAKED BY ONE SHOE THIS IS DANGEROUS.
Problems with pads
To identify the reason why the brakes rattle, you should check the pads. A visual inspection may reveal that:
- counterfeit products;
- consumables are completely worn out;
- unsuitable pads are installed, for example, from another vehicle.
The most common noise in the caliper is fake. The main causes of knocking are shown in the table below.
Table - Origin of knocking noise from counterfeit pads
Reason for knocking | Note |
Delamination of friction material and support lining | Occurs when the manufacturer uses an adhesive mixture with poor adhesion. |
Friction lining melting | Friction material particles stick to the disc, causing vibration and knocking as it rotates. |
Baseplate geometry mismatch | There is a loose fit and uneven distribution of braking forces |
Incorrect pad dimensions | There is a possibility of play in the seat |
Fake pads after 2500 km
If problems arise with the pads, they need to be replaced. In some cases, it is possible to modify the consumable, for example, if the geometry or dimensions differ from the required ones.
In this case, car owners are advised to remove excess parts of the friction material using a file. This should only be done as a last resort, since tampering with the braking system reduces road safety and violates the law.
What other components of the car should we look for the cause?
For those who are interested in what to do when rattling and other noises appear, the following instructions for action will be useful:
- Inspect and evaluate the condition of the brake pads by eye. Pay special attention to pads that have worn out more than half.
- Specifically find a bulge on the road, for example, any bump, and press the brake pedal. If after this the sound disappears, you can make a diagnosis - the problem lies in a faulty caliper.
- To get rid of the last doubts, it is better to dismantle the wheel. The caliper itself is rocked across its position and the size of the play is assessed. It should be no more than 1-1.5 millimeters.
Any calipers operate on brake fluid, which means there is a possibility of a leak. Most often, seals or protective anthers suffer from this. Dirt and water penetrate through worn boots onto the caliper and corrosion processes begin. A leak may appear in the rubber hose connecting the caliper to the brake line.
When you turn the steering wheel, the position of the caliper changes, and with it the position of the brake hose. Due to bending and temperature changes, rubber cracks and subsequently leaks. The fitting used to bleed the system may also fail. Because of this, it becomes airy and the pressure drops. The brake pedal either fails or reacts worse to pressure. All this reduces braking efficiency and road safety.
Getting rid of brake caliper knock using a spring
You can get rid of a leak in the caliper by timely checking this unit for the appearance of foreign stains. They are characterized by another “illness” - the so-called souring of the pistons. Rust gradually eats away at it and prevents it from moving freely in the nest. In practice, this immediately leads to the car moving to the side when braking. The sensitivity of the pedal is impaired, and the disc and pads begin to wear unevenly. This is why it is so important to inspect the condition of the anthers.
Front and rear calipers can break and knock with approximately the same probability. Souring of pistons, leakage of seals and clogged boots are typical for each of the car’s axles. In this case, the load on the front brakes occurs more often, so the operation of their components can occur faster. The rear ones can fail due to the handbrake mechanism located in their pistons.
The life and health of the driver, his passengers, and other road users largely depend on the efficiency and serviceability of the braking system. The caliper, as one of its elements, requires regular checking of its condition. The driver must pay attention to any creaks and other extraneous noises and respond to them in a timely manner.
Development on the steering knuckle
Front and rear disc brakes squeal their pads very often due to wear on the steering knuckles. As a result of prolonged use, the metal is “eaten” at the point of contact with the supporting plate. Upon visual inspection, small grooves may be found on the knuckle, which are signs of wear.
Initially, an extraneous sound appears on bumps, but subsequently it can accompany the entire period of movement of the car. When contacting a service technician with a question about what to do with a worn steering knuckle, the car owner receives two standard ways to solve the problem:
- Using welding, weld metal onto the worn surface.
- Replace the fist.
Both of these methods are very often unacceptable for car owners, as they are very expensive. There are artisanal ways to solve the problem. One of the cheapest and simplest methods is given below. It only requires plastic clamps.
- Clean the protrusions on the fist.
- Insert the tie into the ledge.
- Tighten the plastic tie. Do similar actions for the remaining protrusions.
- Trim off excess.
Since plastic ties do not have high strength, they need to be updated 1-2 times a year. For a longer lasting solution to the problem, it is recommended to use metal. You can fasten it, for example, as shown in the photo below.
Removing and checking the front brake disc
We carry out work to prepare the car as described above.
Remove the front wheel and clean the front wheel brake.
Using a 18mm socket, unscrew and remove the bolts securing the front brake guide to the steering knuckle, remove the front brake assembly 1, Figure 4, and hang it from the suspension spring.
Checking the technical condition of the front brake disc
The brake disc cannot be ground. If there are deep scratches, the disc must be replaced. If the disk thickness is less than 19.8 mm, the disk must be replaced.
If you replace a brake disc on one side, you need to replace the brake disc on the other side as well.
When replacing brake discs, you need to replace the brake pads.
Using a Torx T40 socket, unscrew and remove two screws 3 securing the brake disc to the front wheel hub and remove the brake disc 2.
Brake disc installation
Reinstall the brake disc and secure it to the hub with two screws. The tightening torque of the screws is 12 - 16 Nm (1.2 - 1.6 kgf.m).
Install the front brake assembly onto the steering knuckle and secure it with new mounting bolts. Bolt tightening torque 91 - 120 Nm (9.1 - 12.0) kgf.m.
Install the front wheel.
Press the brake pedal 2-3 times, check, and if necessary, bring the level of brake fluid in the hydraulic brake reservoir to normal.
We check the effectiveness of the service brake system.
Wear of guides and bushings
When the guides and bushings wear out, a knocking noise appears when braking, as well as on uneven road surfaces. In the most advanced cases, the pads rattle throughout the entire movement. To solve the problem, you need to purchase a special repair kit. It includes 2 boots, 2 guides, 2 bushings and special lubricant.
Instructions for eliminating pad knocking due to the guides are given below.
- Unscrew the two caliper guides.
- Remove the caliper.
- Knock out the bushing.
- Replace the bushing and reassemble everything in reverse order, using the elements from the repair kit.
Discs
Failed discs can also cause pads to knock. As a result of intense braking, the metal heats up. When driving through a puddle, water entering leads to deformations. Disc beating occurs. In this case, the knocking of the pads directly depends on the speed of the car. Elimination of runout is possible by boring, but provided that the deformation is not significant and the thickness of the disk is sufficient. Otherwise, it needs to be replaced.
The use of low-quality discs leads to their delamination. This causes damage to the pads and their knocking. The problem can be fixed only by replacing the disks with high-quality ones.
Is the caliper really knocking?
In fact, there are many elements in the car that can knock. These are the same engine valves and the notorious hydraulic compensators, the knocking of which we recently talked about. But the calipers also knock. Moreover, this phenomenon is quite common.
For some cars, such symptoms are quite common and their appearance is purely a matter of time.
The first step is to determine whether the calipers are actually knocking. Fortunately, there is no need to go to a car service center and spend money on expensive diagnostics. You can do it on your own. The knocking noise is most noticeable when the car is moving at low speed. It is worth intentionally driving through easy obstacles. The easiest option is to drive over a speed bump or drive onto the ground. And as soon as you press the brake, the knocking will disappear.
One of the disadvantages of the defect in question is the fact that it is not covered by warranty defects. Roughly speaking, if the car is under warranty, you will have to repair the calipers at your own expense.
Drum brake pads
Drum pads knock much less often. In most cases, the problem is due to excessive stretching of the springs of the mechanism. Elimination of chatter is carried out by rebuilding the drum brake. To do this, you must first purchase a special repair kit.
If knocking occurs immediately after replacing the drum pads, this indicates their low quality. The contact of friction material from a collapsing consumable on the drum leads to contamination of its surface, which causes impacts on the pads and their clanking.
Causes of knocking noises
Since you can independently determine the knocking noise from the caliper when testing the suspension on uneven surfaces, you can also safely tackle the problem with your own hands.
There is nothing scary or difficult about this. This happens on a variety of machines, including:
- Toyota Corolla;
- Gazelle;
- Lada Largus;
- Ford Focus;
- VAZ 2110;
- Mercedes Sprinter;
- Renault Logan;
- VAZ 2114;
- Lada Vesta;
- Chevrolet Aveo (every 30 thousand km);
- Hyundai Solaris, etc.
The reason usually lies in one of 3 reasons.
This includes poor fixation of the element, wear on the guides, as well as wear on the brake pads. In the latter case, the pads themselves will actually knock, although the symptoms manifest themselves identically. In any case, you will have to go there and take appropriate measures.
Now we will consider each reason separately.
The pads are worn out
The first thing that should be checked when such symptoms occur is the pads.
There are two simple diagnostic methods that you can do yourself.
- While driving. If you feel that the car brakes worse with the same pressure on the pedal, plus there is a creaking noise when braking, the pads are probably seriously worn out. This also includes such a symptom as beating in the pedal;
- Visual method. You will have to get to the pads by removing the wheel and examine their condition visually. Worn linings indicate a problem. Even if they are not completely erased, it is better to treat the node immediately.
On every car, the pads must be replaced after a certain period. Usually this is 10-15 thousand kilometers.
If the pad is worn out, the driver will observe a sound reminiscent of a knocking sound from the caliper. Under no circumstances should the pads be allowed to wear excessively, otherwise this could result in damage to the brake disc. Also, such pads can squeeze out and cause jamming of the car brake cylinder.
Having dealt with the wear of the pads in the calipers, we move on.
The culprits are the guides
There is a rather important component in the brake system, called caliper guides. When they wear out, it is necessary to take measures to replace the components.
In fact, there may be 2 problems here.
- The guides themselves are worn out. If these elements are worn out, then there is no need to repair or restore anything. You just need to purchase new guides and install them in place of the old ones. Based on the video instructions, this will be quite easy to do;
- The sockets are worn out. The guides have sockets that also wear out over time. Special repair rubber bands will help you here. These rubber bands are put on the pin, thereby the guides stop causing knocking.
What you shouldn’t do is use the so-called collective farm method. It consists of drilling additional holes in the brake system cylinder block, as well as in the caliper itself, after which the elements are tightened. For this, a spacer spring is used.
In some cases, knocking noise due to the guides can be eliminated with lubricant. It is applied in a thick layer, after first removing it from the nest.
Sometimes lubricant helps to get rid of extraneous noise for a long period. For some, the sound appears again after 200-500 kilometers, for others it lasts several thousand kilometers.
Procedure
- First, we purchase suitable pads. The set of front consumables consists of 4 pieces (2 pieces on each side).
- We control the brake circuit fluid level in the corresponding reservoir (under the hood) using the marks on its body. If the level reaches the maximum level, then it will need to be taken with a syringe, since after installing the new pads there will be a natural (due to the greater thickness of the pads) rise.
- We loosen the tightening torques of the bolts of the front wheel from which the replacement is supposed to begin.
- We hang this part of the car with any available device designed for this purpose. We remove the wheel. Don't forget about safety supports (if a jack is used).
- We take a screwdriver, which we insert between the pad and the disc, and with a pressing force we move it towards the cylinder. The rod is hidden in the cylinder, which provides free space for removing the pads.
- Now we loosen the tightening torque of the caliper bracket, and then move it up.
- We remove the old pads.
- We inspect the springs of the clamping mechanism for their deformation and breakage. If this fact is obvious, then we change it.
- We check the integrity of the rubber covers on the caliper guides. We lubricate the guides themselves with a special compound. This will prevent them from souring, and the bracket will move freely during the exit or entry of the piston.
- We carefully clean the seats for new pads.
- The linings on “fresh” pads are thicker than on old products, so the piston must be recessed to the full extent of its stroke. This will provide enough space for the correct installation of consumables.
- After installation, perform the assembly process in reverse order.
Replacement of front brake pads is completed. We repeat the entire list of these manipulations on the other side of the LADA Largus.
If there is a need to replace the rear pads, then the principle of operation is similar, with the exception of some nuances.
This is interesting: Removing and installing the mudguard of the front bumper of Lada Largus