Contents: Disassembly ↳ Assembly ↳
If the wheel brake cylinder is not going to be replaced, it can be disassembled in the installed state. Later, be sure to replace the brake cylinder if brake fluid leaks through the cuff. When replacing the brake linings, pull the dust seals off 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 with difficulty, there are scratches or corrosion spots. In this case, the wheel does not brake or brakes constantly.
Disassembly
Remove the brake pads.
Carefully, being careful not to damage them, remove the "H" anthers with a screwdriver.
Remove both pistons "G" with seals "F".
Warning! Some brake fluid may leak out, put a rag underneath.
Remove spring "A" from brake cylinder "E". The parts shown in the figure: B - air bleed bolt; C - mounting bolts; D - seal.
Remove the seals from the pistons, being careful not to damage the pistons.
Wipe the inner surface of the cylinder with a clean cloth. There should be no scratches or corrosion on the working surface, otherwise replace the cylinder.
Clean all parts with alcohol or brake fluid. Follow the instructions when working with brake fluid.
Warning: Do not use mineral-based fluids such as gasoline or kerosene, otherwise this may cause defects in the brake system later.
Assembly
Check the ease of turning the air bleed bolt; replace the bolt if necessary.
Before assembly, wash all internal parts in clean brake fluid. Use the entire repair kit for repairing brake cylinders.
Install the seals on the piston so that the sealing lips are directed towards the inside of the cylinder.
Insert the left piston into the cylinder.
Install the expansion spring.
Before installing the right piston, open the air bleed valve by unscrewing the air bleed bolt 1-2 turns. After assembly, tighten the air bleed bolt without applying much force, with a torque of no more than 10 Nm.
Put on the dust covers.
Install the brake linings and brake drum.
Remove air from the brake system. Usually, it is enough to bleed the wheel cylinder from which the brake hose was disconnected. If the brake pedal is soft after bleeding, bleed the entire brake system.
Press the brake pedal firmly several times to set the rear brakes.