To disassemble the main brake cylinder of the front brake, it is necessary to remove it from the handlebar of the motorcycle (see «Front brake master cylinder - removal and installation»).
Disassembly
1. Using tweezers, we remove the damper from the nest at the bottom of the tank.
2. Carefully, so as not to tear, remove the piston boot with tweezers.
3. Remove the piston retaining ring with special pliers.
4. We remove the piston assembly with the cuff from the cylinder.
5. We remove the cuff assembly from the cylinder with a return spring.
6. We examine the details of the brake cylinder. Tears, cracks are not allowed on the cuffs, they should not be deformed. In addition, the cuffs must have sufficient flexibility. Otherwise, brake fluid leakage is likely and the brakes may not be effective due to fluid bypass. There should be no deep scratches, aluminum enveloping or other mechanical damage on the cylinder walls. The anther should not have cracks or tears. If necessary, we replace parts with the indicated damage. Often, if the integrity of the piston boot has been compromised, dirt and oxides accumulate on the outside of the piston. Before assembly it is necessary to clean the piston from foreign deposits.
1 - piston return spring; 2 - working cuff; 3 - body of the brake cylinder with a reservoir of brake fluid; 4 - piston assembly with cuff; 5 - piston retaining ring; 6 - piston boot
Attention! Brake parts may only be washed with clean brake fluid. It is not permissible to use carburetor cleaner, brake cleaner, gasoline, solvents and other similar substances for flushing, since rubber parts of mechanisms are irreversibly deformed and destroyed upon contact with them.
7. We wash the parts with clean brake fluid.
Assembly
1. Before assembly, it is recommended to blow all parts and channels of the brake cylinder with compressed air to prevent dust and dirt particles from entering the brake system.
2. We assemble in the reverse order.
3. We install the return spring of the piston with the narrow end to the working cuff.
The arrow indicates the direction of installation to the cuff
4. After assembling and installing the brake cylinder in place, we pump the front brake circuit (see «Hydraulic brake drive - brake fluid replacement and pumping»).