Wheel Brake Cylinder Repair

If the wheel brake cylinder is not to be replaced, it can be disassembled in the installed state. Later, be sure to replace the brake cylinder if brake fluid seeps through the cuff. When replacing the brake linings, pull off the dust caps from the brake cylinder and check the condition of the inner surface. If the inner side of the cuff is wet or the entire cylinder is wet with brake fluid, it must be replaced. In addition, replace the cylinder if the piston moves hard in it, there are scratches or foci of corrosion. In this case, the wheel does not brake or brakes constantly.

Disassembly

Remove the brake pads.



Carefully, trying not to damage, remove the anthers -H- with a screwdriver.

Remove both pistons -G- with cups -F-.

Attention! In this case, a little brake fluid may leak out, put a rag on it.

Remove the spring -A- from the brake cylinder -E-. The details shown in the figure: B - air removal bolt; C - fastening bolts; D - seal.

Remove the cuffs from the pistons, do not damage the pistons.

Wipe the inside of the cylinder with a clean cloth. On the working surface there should be no scratches and foci of corrosion, otherwise replace the cylinder.


Clean all parts with alcohol or brake fluid. Follow the instructions for handling brake fluid.

Attention! Do not use mineral-based fluids such as gasoline or kerosene, otherwise it may cause defects in the brake system later.

Assembly

Check the ease of turning of the air bleed bolt, replace the bolt if necessary.

Before assembly, flush all internal parts with clean brake fluid. Use the complete brake cylinder repair kit.

Install the seals on the piston so that the sealing petals are directed into the cylinder.

Insert the left piston into the cylinder.

Install the spacer spring.

Before installing the right piston, open the bleed valve by backing out the bleed screw 1-2 turns. After assembly, screw in the bleeder screw without applying much force, with a torque of no more than 10 Nm.

Put on dusters.

Install brake pads and brake drum.

Remove air from the brake system. In this case, it is usually enough to pump the wheel cylinder from which the brake hose was disconnected. If the brake pedal is soft after bleeding, bleed the entire brake system.

Depress the brake pedal hard several times to set the rear brakes.