Carefully pull the lower edges of the wheel cylinder boots away from the cylinders to see if the interior of the cylinder is wet with brake fluid. Excessive fluid at this point indicates leakage past the piston cups and a need for wheel cylinder replacement.
A slight amount of fluid is nearly always present and acts as a lubricant for the piston.
REMOVAL & INSTALLATION
See Figures 1, 2 and 3
- Raise and safely support the vehicle.
- Remove the wheel and tire assembly and the brake drum.
- Remove the brake shoe assembly.
- Disconnect the brake line from the wheel cylinder at the backing plate. The line will separate from the wheel cylinder when the wheel cylinder is removed from the backing plate.
- Remove the wheel cylinder attaching bolts and remove the wheel cylinder.
Be careful to prevent brake fluid from contacting the brake shoe linings or they must be replaced.To install:
- Wipe the end of the brake line to remove any foreign matter before making connections.
- Position the wheel cylinder on the backing plate and finger-tighten the brake line to the wheel cylinder.
- Install the wheel cylinder attaching bolts and tighten to 10-20 ft. lbs. (14-28 Nm).
- Tighten the brake line fitting nut to 10-18 ft. lbs. (13-24 Nm).
- Install the links in the ends of the wheel cylinder and install the brake shoe assembly.
- Adjust the brakes and install the brake drum. Bleed the brake system.
- Install the wheel and tire assembly and lower the vehicle.