Removing
1. Remove the brake drum.
2. Using a clamp, pinch the brake hose at the point closest to the working brake cylinder.
3. Using pliers, remove the upper return spring that compresses the brake pads. Remove the upper ends of the brake shoes from the pistons of the working brake cylinder.
4. Remove any dirt around the junction of the brake hose and the rear of the working brake cylinder. Unscrew the union nut. Being careful, take a brake pipe from the working brake cylinder and close it with a stopper.
5. Unscrew two bolts of fastening of the working brake cylinder to a brake board. Being careful, remove the working brake cylinder.
Repair
1. Clean dust and dirt from the working brake cylinder.
2. Remove the dust covers from each end of the cylinder.
3. Remove both pistons with o-rings from the brake cylinder.
4. Check the condition of the pistons and brake cylinder for wear, corrosion and other defects.
5. Install the O-rings on the piston, lubricate them with clean brake fluid and install the pistons in the brake cylinder.
6. Install dust caps.
Installation
1. Wipe the brake shield, install the brake pipe on the brake cylinder and tighten the union nut two turns.
2. Screw in bolts of fastening of the working brake cylinder. Finally tighten the brake line nut.
3. Remove the clamp from the brake hose.
4. Install the brake shoes on the pistons of the brake cylinder and install the upper return spring.
5. Install the brake drum.
6. Remove air from the brake system.
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