Remember that the dust generated during the operation of the brake mechanisms may contain asbestos, which is extremely harmful to human health. Never blow off dust with compressed air or inhale it - wear a protective mask or respirator when servicing mechanisms. Never use gasoline or petroleum-based solvents to clean brake system components - use only branded cleaners or methyl alcohol!
Both brake calipers on the same axle must be changed at the same time.
Removing
1. Support the front wheels with wheel chocks, jack up the rear of the vehicle and place it on jack stands, remove the appropriate rear wheel.
2. Fully lower the parking brake lever and loosen the adjusting nut to loosen the drive cable.
3. Use a screwdriver to depress the parking brake actuator behind the rear wheel brake caliper and disconnect the drive cable from it. Loosen the lock nut and release the cable sheath from the support bracket for removal.
4. Remove the cap from the GTZ reservoir, put a plastic film under it and screw it in place - laying the film seals the fit of the cap and prevents fluid from escaping when the flexible brake hose fitting is released. Alternatively, the hose can be clamped with a suitable clamp.
5. Thoroughly clean the hose fitting on the caliper. Turn out a hollow bolt of a socket and remove copper sealing washers, - washers are subject to replacement without fail. Seal the open end of the hose and fitting immediately to prevent dirt from entering the system.
6. Remove the brake pads (see Replacing the pads of the disc brake mechanisms of the rear wheels). Remove the caliper from the upper guide bearing.
7. If necessary, remove the mounting bolt (3) anchor bracket (4) caliper to the lower control arm.
Repair
The rear caliper is not subject to restoration repair and, in case of failure, is replaced as an assembly.
1. Remove the lower guide post from the anchor bracket and wipe it thoroughly. If there are signs of excessive wear, replace the strut - before installation, the strut should be lubricated with silicone grease.
2. If the caliper is equipped with a damping weight, disconnect the spring and remove the parking brake cable bolt. Transfer the appropriate parts to the new caliper and tighten the mounting bolt to the required torque, after lubricating its threads with a locking sealant.
Installation
1. If removed, install the caliper anchor bracket on the suspension arm. Screw in the mounting bolts and tighten them with the required force - before installation, the threaded part of the bolts should be lubricated with a fixing sealant.
2. Clean the top guide post of the caliper and lubricate it with silicone grease. Put the caliper on the stand and install the brake pads (see Replacing the pads of the disc brake mechanisms of the rear wheels).
3. Having replaced sealing washers, connect a flexible brake hose to a support. Make sure that the hose fits correctly in the caliper recess, then tighten the nipple bolt to the required torque.
4. Remove the hose clamp, or remove the polyethylene from under the GTZ reservoir cap and bleed the brake system (see Bleeding the brake system).
It is enough to pump only the circuit whose caliper was removed.
5. Attach the parking brake cable to the caliper caliper bracket and secure it with the retaining bracket.
6. Wring out the executive lever and connect a drive cable to its hook.
7. Depress the foot brake pedal several times to shrink the shoes.
8. Adjust parking brake cable (see Parking brake actuator adjustment), then install the cover on the control lever.
9. Install the wheel, lower the vehicle to the ground and tighten the wheel bolts to specification.
10. Check the fluid level in the GTZ reservoir, correct if necessary (see chapter Current service).
11. Before starting the operation of the car, check the proper functioning of the brake system.
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