In the event of a brake fluid leak, the wheel cylinders must be replaced without fail. Manufacturers do not recommend attempting to refurbish these brake assemblies.
Removing
1. Support the front wheels with wheel chocks. Jack up the back of the car and place it on jack stands.
2. Remove the brake drum and shoes (see Removal, condition check and installation of a brake drum).
3. Clean the wheel cylinder and surrounding surfaces from dirt.
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.
5. Remove the upper return spring and spread the brake shoes apart, releasing them from the pistons.
6. After carefully wiping the fitting, disconnect the hydraulic line from the rear of the wheel cylinder. To avoid rounding of the splines of the fitting, use a special box wrench with a split head. When disconnecting, do not pull on the metal tube of the brake line to avoid its deformation, which can significantly complicate the connection procedure. Seal the open end of the brake line immediately to minimize fluid loss and prevent dirt from entering the hydraulic system.
7. Turn out a bolt of fastening of the wheel cylinder.
8. Remove the wheel cylinder from the brake shield and transfer it to a clean workbench.
If there are traces of hydraulic fluid on the friction linings of the brake shoes, the shoes should be replaced and the working surface of the drum thoroughly cleaned.
Service
1. Thoroughly wipe the outside of the cylinder.
2. Remove both anthers from the cylinder.
The design of the wheel cylinder of the drum brake mechanism of the rear wheel
3. Usually the pistons are freely pushed out of the cylinder under the influence of the force developed by the spring. If necessary, plug the end hole of the cylinder with a wooden plug, push the piston out by supplying air to the cylinder through the inlet from the foot pump.
4. Carefully examine the condition of the working surfaces of the cylinder and pistons. If any obvious defects are found, replace the cylinder.
The compilers of this manual recommend replacing the cylinders of both brake mechanisms of the rear wheels at the same time.
5. If the condition of the components is found to be satisfactory, replace the sealing cuffs and anthers - the corresponding repair kits can always be found in car accessories stores.
6. Lubricate the new cuffs of the pistons with clean brake fluid and fill them with your finger into the cylinder, planting a spring in the middle.
7. Dip the pistons in clean brake fluid and fill them into the cylinder.
8. Install new anthers and check the freedom of movement of the pistons.
Installation
1. Make sure that the mating surfaces of the cylinder and brake shield are absolutely clean and dry. Spread the shoes, install the cylinder in its original place and connect the hydraulic line to it - do not tighten the union nut yet.
2. Screw in the fixing bolts and tighten them firmly - now the flare nut can be finally tightened. Remove the polyethylene placed under the cover of the GTZ tank.
3. Fit the shoes into the piston grooves and reinstall the top return spring.
4. Install the brake drum (see Removal, condition check and installation of a brake drum).
5. Bleed the brake system (see Bleeding the brake system), - it is enough to pump only the circuit whose cylinder was removed.
6. Adjust parking brake cable (see Parking brake actuator adjustment). And reinstall the cover of the control lever.
7. Before starting the operation of the car, make sure that the brakes are working properly.
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