Wheel Cylinder

GENERAL INFORMATION

Drum brake wheel cylinder components

1. Dust boot

2. Piston head

3. Piston

4. Piston seal

5. Cylinder

6. Bleeder screw

7. Cap

Wheel cylinder bleeder screw and bolts A. Bolts B. Bleeder screw

Removal

PROCEDURE

1. Remove the brake drums.

2. Remove the brake shoes.

3. To reduce fluid loss, tightly screw on the reservoir cap with polyethylene film in place, or pinch off the hoses.

4. Clean the wheel cylinder mounting bolts and the bleeder screw.

5. Unscrew the bleeder screw and plug the tube and the cylinder opening.

6. Unscrew the bolts and remove the wheel cylinder.

Disassembly

PROCEDURE

1. Clean dust and dirt from the cylinder by wiping it with a rag moistened with alcohol.

2. Remove the boots.

3. Make identification marks on the cylinders.

4. Remove the pistons and spring.

5. Replace all cylinder seals without exception.

6. Inspect the piston and the inner surface of the cylinder.

7. If these parts show defects, replace the complete wheel cylinder assembly.

8. Before assembly, thoroughly clean all parts. Lubricate the pistons, spring, and cups with brake fluid.

9. Install the cups on the pistons.

10. Carefully insert the first piston into the cylinder, aligning it with the marks made during disassembly.

11. Install the spring and the second piston.

12. Install the boots on the cylinder, lubricating their lips with brake fluid.

Installation

PROCEDURE

1. Install the cylinder in the reverse order of removal.

2. Bleed air only from the wheel brake hydraulic circuit (if the other circuits were not disturbed).