One fine summer day, while examining Skye after a short trip, I noticed that heat was emanating from the Right Rear brake disc - you couldn’t hold your finger on the disc like an iron! doubting the naturalness of what was happening, I examined and felt the Left Rear brake disc... cold. In addition, later a very unpleasant squeaky-squeaking sound appeared from the right rear disc.
Why the brake disc felt so obviously abnormal, at that moment I had no idea, much less how to treat it. but I decided to figure it out and fix it myself.
1. Removing the Caliper. Diagnosis.
I stopped by a good friend's garage, lifted the right side, removed the wheel, felt for the mounting bolts of the Right Rear caliper (there are two of them, both 19′, located horizontally, on the back side of the brake disc), washed everything off the dirt and tried to unscrew them... not here that was O. the bolts are stuck!
Having poured almost half a can of WD-40 (fortunately, purchased in advance) onto the stuck bolts, he took the hammer in full force and, traditionally in such cases, uttering curse after curse, not forgetting about all the well-known terrible curses, began to rain blow after blow on the opposite end of the wrench placed on the bolt. but he didn’t even think about getting out.
Fortunately, all this recklessness attracted the attention of understanding people nearby. from conversations with whom I learned:
A. The root of the problem is a stuck caliper. that is, the caliper is in a state of continuous braking, clamping the brake disc with the pads, which, in turn, overheats from continuous friction. reason for continuous braking: when you press the brake pedal, the piston (No. 9 in the diagram), coming out of the cylinder body (No. 7 in the diagram), presses on the pads, BUT when you release the brake pedal, the piston does not retract into the cylinder as it should, but continues to press on pads that clamp the brake disc. the reason the piston does not retract into the cylinder (in my case): mechanical particles, corrosion on the outer walls of the piston and the inner walls of the cylinder interfere with the natural movement of the piston forward/backward when the brake pedal is pressed and when it is released. B. there is a special lubricant for the caliper mounting bolts and it must be used to avoid sticking
