What is the mileage before replacement on a Toyota Corolla?
The pads should be changed if the diagnostics showed extreme wear of the friction clutch (less than 2 mm) or you saw an obvious increase in the braking distance. Another sign is a loud squeak when braking. The average service life of front pads on foreign cars is 25–30 thousand km. The rear ones go twice as long. But it is always necessary to look at the actual condition. numbers of original pads: how to press out the brake cylinder when replacing. Average times may vary significantly due to driving style or the properties of the spare part.
The piston on the front brake caliper does not press in
Messages: 171 Registered: May 31, 2011, 00:00 Car: Ford focus 111
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The piston on the front brake caliper does not press in
Post by Liss-solo » Mar 15, 2012, 05:14 pm
Messages: 581 Registered: Dec 21, 2011, 00:00
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Post Automotive technical assistance » March 15, 2012, 5:26 pm
Soured/internal wear of parts. The cylinder requires repair/replacement
Added after 3 minutes 23 seconds:
Perhaps the pads did not come back, so the brake disc was deformed due to overheating. Disc for re-grooving or replacement.
Source
Disc brakes
- To access the pads we need to remove the upper part of the caliper. It is held in place by only two bolts on the reverse side.
Hold the caliper and unscrew the mounting bolts
Unscrew them without allowing the guides to turn.
To fix, use the 2nd wrench
Now remove the top part by simply pulling it upward.
Pull up the freed part
Old pads can be removed by hand. As I already wrote, the brake piston pads. Moreover, at. If they don’t “go”, then help yourself with a screwdriver.
Pull out worn out pads
To install new linings, install their special guides and push them deep.
Press the record deep for secure installation
The block with the tin plate should be on the inside. This bar serves as a wear indicator. When the friction material wears away, it rubs against the disc and makes a loud squeak.
The tin plate must be inside the mechanism
Before reassembling, it is necessary to recess the brake cylinder, since the new linings are thicker. You simply cannot put the caliper back on. If you just push, nothing will happen. It is necessary to screw the cylinder clockwise using pliers.
Replacing the master brake cylinder
When you press the brake pedal, pressure is created in the hydraulic brake actuator using this brake cylinder. The separate circuits of the hydraulic brake drive receive fluid from 2 independent circuits.
The main brake cylinder consists of the following elements:
- 2 pistons for brake circuits;
- Return springs;
- O-rings.
If air gets into the brakes, it is necessary to bleed the master cylinder, as well as the entire system. To bleed, you need to use a jack or inspection hole. Air removal is not done immediately, first from the first circuit, and then from the second.
If the cylinder is damaged, it must be replaced.
Master brake cylinder
Replacement procedure:
- The vacuum booster, brake cylinder and pipelines must be thoroughly cleaned of dirt.
- The lines need to be removed from the brake cylinder.
- Next, you should unscrew the clamps that tighten the hoses on the fittings and remove them. Using a special wrench, remove the brake pipes.
- To remove the master cylinder, you need to unscrew 2 nuts from the vacuum booster.
- Remove the cap from the filler reservoir and drain all the brake fluid.
- To ensure that there is no brake fluid in the master cylinder, it must be turned so that the reservoir is at the bottom, and when the piston is pressed, brake fluid can flow out of the cylinder.
- It is necessary to remove the tank from the cylinder using a wooden spatula.
- Remove the connecting bushings from the master cylinder shell.
- Using thin pliers, remove the retaining ring.
- Pull out the piston with cuffs and spacers.
- After replacement, all components are installed in the reverse order.
How to recess the rear caliper piston
Today I lubricated the rear caliper guides, but I couldn’t get the piston to sink no matter how hard I tried, everything came together tightly and now the hub is heating up. How to drown him?
Try it with a pry bar or a small crowbar.
Someone wrote that it seems like you need to twist and press, but with what and how?
Tried it, doesn't work
Someone wrote that it seems like you need to twist and press, but with what and how?
The piston must be twisted. Using sliding pliers.
it needs to be screwed in; a grinder key is great for this.
I'll try it today and post the results
They are usually screwed in clockwise. It is recessed very tightly and in a small turn, in the service standards there is a special gadget. If you use a key for an angle grinder or a bike, loosen the bolt a little so that when pressed, the brake fluid flows out. The piston will go in much easier
. cut the hose it will be even easier
+1000 clockwise, the main thing is not to overdo it and don’t catch the boot - it will tear
Thanks to all! Everything worked out. I lubricated all the guides, as quiet as in . I didn’t even turn on music, I enjoyed the silence.
Damn, I'm also interested in this topic, I tried to change the rear pads over the weekend. So everything seems to be fine, damn it changes, but I couldn’t move the piston. True, the description says that you need to unscrew the hose from the caliper, but to be honest. I was afraid to unscrew it since I was in an area 250 km from Moscow. What are some easy ways to remove a brake piston? Mosh, who has the key, so to speak, for these matters. I agree to rent it if you don’t mind.
In the end, how did I solve this problem? tell the society?
Detailed instructions for repairing calipers
The most common cause of brake caliper failure is its souring and subsequent jamming.
If the caliper is regularly maintained and lubricated, it can last for decades without any repairs. But the main thing is to choose the right lubricants!
If interested, read about choosing lubricants. In this article we will work with them, but I will not spend letters in this article describing these lubricants.
Caliper repairs can be divided into three categories:
- Mandatory caliper lubrication when replacing pads
- Reanimation of the caliper if the wheel is already heating up
- Complete disassembly of the caliper and replacement of worn elements
The first two categories can be viewed via the links. And in this article we will look at the third category, when it is too late to drink Borjomi and surgical intervention is necessary.
Most often, the reasons for complete caliper failure are two things:
- The caliper has never been lubricated or serviced. As a result, the piston and guides were severely corroded.
- The caliper was not lubricated with what was needed. As a result, the lubricant turned into plasticine or powder, and the anthers and cuff mercilessly swollen.
In these two cases, you can no longer get by with half measures and you will have to do the job thoroughly.
Causes and solution to the problem
Quite often, the cause of a wedge that appears along the way is a breakdown of the parking brake, which occurs due to weakening of the spring or the formation of corrosive changes on the return brackets and other elements of this working body.
Replacing them will help correct the situation, but as a temporary measure, experts recommend returning the staples to their original position, using a regular hammer for these purposes.
Has the brake disc started spinning again, albeit with only a slight amount of tension? Then you can drive, not forgetting that you can use the handbrake only after it has been fully repaired.
It is possible that the cause of everything was a wedge of calipers, caused by rust or other small elements getting into the inside of the piston mechanism, which greatly complicates its movement, or even makes it completely impossible.
A temporary solution to this problem requires more experience and effort, involving tapping the calipers through some kind of wooden spacer or creating a small gap between the disc and the pads. The probability that such half-measures will produce results usually does not exceed 50%, but even in this case they do not exclude complex repairs.
See also:
5 reasons why brakes squeak and squeal and what they mean
In order to loosen jammed elements, it is recommended to use special devices that, in their principle of operation, resemble the fastenings of old mechanical meat grinders, or use a jack of a rhombic design. In the absence of the latter, some craftsmen find an alternative even in a manual pistol mechanism for construction glue, however, then you will have to work hard, although the result will be almost the same as when using a jack.
It’s even worse if the pads jam along the way, and it’s not so bad when the fault is due to their displacement, which can be eliminated even manually. If the element fails due to mechanical destruction or thinning of the friction material, then the driver has no choice but to replace the pads on the spot, unless, of course, he has a similar set available, which in itself is unlikely. You can dismantle them, which will allow you to slowly get to the nearest service station.
See also:
Why do brake pads wear unevenly?
It is important to remember that caring for the brake system, which involves timely replacement of its elements and technical fluids, will significantly extend its service life. In addition, you should avoid overloading the passenger car by not carrying all sorts of heavy loads on it, since this also negatively affects the condition of the brakes.
Guide faulty
The main problem if the brake does not work can be jamming and souring of the caliper guides.
Repairing this malfunction with your own hands will not be difficult. By the way, in this case there is no difference when disassembling both the front and rear calipers. To do this, you need to unscrew and pull out both guides. Clean them from dirt or poor-quality lubricant, remove and replace the torn boots with new ones, after filling them with special grease for calipers.
Then put them in place, insert and screw the guides back. Then you should try how freely the pressure bar moves along them. This can be seen visually in the attached video at the end of the article.
What is the tool used for?
The pressing device is used during brake system repairs.
When the caliper is removed from the disc, the rod remains in the pressed-out position and does not allow the part to be installed back.
To complete the repair, you need to press it into place. Many car enthusiasts use for this purpose everything that is at hand: a vice, keys, etc. However, you can make a special device that will greatly facilitate the task.
The piston is pressed down due to a screw-in worm mechanism.
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How to make it yourself
To make the device yourself, you need to prepare three nuts, a long bolt and old pads.
The whole process will consist of four simple steps:
- Take a drill according to the diameter of the fastener and drill a hole in the block exactly in the center.
- Weld the nut to the hole.
- Sharpen the bolt to a cone.
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- Weld two nuts to the head of the bolt to form an improvised valve.
This tool is only suitable for front calipers. For the rear ones, you need to add a special hook to the end of the fastener, which will rotate the rod.
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After repairing the brake system, do not throw away the old part. You can use it to make a simple but necessary tool for recessing pistons.
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