Replaced front and rear pads and rotors on 99 blazer. Had an issue with a rear caliper that was sticking, took it to meineke and they replaced the right rear caliper and bled the brakes but the brakes still go almost all the way to the floor. The rear pads came with shims but the calipers would not fit over the pads with the shims and I am pretty sure that I the caliper was depressed all the way.
I do not have any leaks to the brakes.
Master Cylinder??? Should I try installing the pads with the shims on again???
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Normally I would say check the brake hose, but that would only be for one wheel. If the rear brakes are not releasing normally, either something is keeping pressure applied, or the calipers are not sliding back. If both inner and outer pads are wearing down equally on both wheels, I would look for a pressure problem. If only the outboard pads are wearing, the calipers are sticking in place.
make sure that the calliper body is free to move on the support pins
the pins are there to allow the calliper to centralize on the rotor
if the pins are seed up then when pressure is applied to the piston the calliper is pulled sideways but then keeps that pad in hard contact with the rotor
as there is no check valve in the master cylinder for disk brakes, there may be a problem in the compensating port for the disc section that is keeping the disc brake section on
In order to retract the pistons on the rear calipers you need to use a special tool that will rotate the piston in a clockwise direction.It may be possible to try to use a strong needle nose plier.Apply force against the U shaped slots on the piston and rotate clockwise until the piston bottoms out.Before you reinstall the caliper make sure that the recessed slots are at 12 and 6 "o"clock..the slots align with one or two bumps on the inside pad. If you are having problems with your calipers rebuilt one are a good option.If only the caliper slide pins are sticking they can be cleaned and lubricated.Pin lubricant sometimes comes with a set of brake pads.Other than that lube may be purchased separately at an automotive supply store.
bleed the brake again. if the pedal goes to the floor with little resistance, then the master cylinder is your problem.
the shim is to depress the noise when you applied the brake. you can skip that, if the brake works without it.
I replaced the rotors and pads on my right hand drive Blazer and had the same problem ,dont worry in a couple of days normal running the pressure goes away and you dont get the heat problem. Its just the new pads bedding in.