The wheel cylinder is a key component in the drum brake system. This component pushes the brake shoes outward when the brake pedal is pushed. This happens when the brake fluid travels to the wheel cylinder pushing the two pistons out and in turn, pushing against the brake drum surface. The wheel cylinder contains 6 components: the wheel cylinder body, bleeder screw, spring assembly, seal, piston and the wheel cylinder boot. Repairing the wheel cylinder is a moderately challenging task but can be accomplished by the novice mechanic in under three hours with the correct tools.
Tools Used: Pliers, Brake cleaner, Wheel cylinder rebuild kit
Rebuild Rear Wheel Cylinder
Remove the wheel cylinder rubber boots off of both ends by simply pulling off the groove. Remove the wheel cylinder piston seals by grabbing them with a pair of pliers and pulling them out of the cylinder.
Spray the brake cleaner throughout the wheel cylinder to ensure that all of the components are clean. Allow all parts to dry thoroughly.
Lubricate the inner wheel cylinder bore with fresh clean brake fluid. Install the new wheel cylinder piston seal by inserting it into the wheel cylinder bore with the flat side facing outward. Install the new wheel cylinder pistons with the flat side facing inward.
Install the new wheel cylinder rubber boots onto both ends of the wheel cylinder making sure that the boots sit in the groove.
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