Note. In the event of leakage, the wheel cylinders must be replaced without fail. Manufacturers do not recommend attempting to refurbish these brake assemblies. Wheel cylinders are always replaced in pairs.
Removing
1. Jack up the rear of the vehicle and place it on jack stands. Support the front wheels with wheel chocks.
2. Remove the brake drum and shoes (see Section Replacement of shoes of drum brake mechanisms of back wheels).
3. Clean the wheel cylinder and surrounding surfaces from dirt.
4. Disconnect the hydraulic line from the rear of the wheel cylinder. When disconnecting, do not pull on the metal tube of the brake line to avoid its deformation, which can significantly complicate the connection procedure. Loosening the nut should be done with a special ring wrench with a split head. Seal the open end of the brake line immediately to minimize fluid loss and prevent dirt from entering the hydraulic system.
5. Turn out two bolts of fastening of the wheel cylinder.
6. Remove the wheel cylinder from the brake shield and transfer it to a clean workbench.
Note. 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.
Installation
1. Install the cylinder in its proper place and connect the hydraulic line to it (do not tighten the union nut yet). Screw fixing bolts and tighten them with the required effort.
2. Now you can finally tighten the flare nut. Reinstall shoe assembly (see Section Replacement of shoes of drum brake mechanisms of back wheels).
3. Bleed the brake system (see Section Checking the condition and replacing brake lines and hoses). Reinstall the wheels, lower the vehicle to the ground and tighten the wheel nuts to the required torque (see chapter Settings and ongoing maintenance).
4. Before starting the operation of the car, make sure that the brakes are working properly.