GM Caprice 1990-1993 Repair Guide

Wheel Cylinders

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See Figures 1 and 2



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Fig. Fig. 1: Removing the wheel cylinder



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Fig. Fig. 2: Exploded view of typical wheel cylinder

REMOVAL & INSTALLATION




CAUTION
Brake shoes contain asbestos, which has been determined to be a cancer causing agent. Never clean the brake surfaces with compressed air! Avoid inhaling any dust from any brake surface! When cleaning brake surfaces, use a commercially available brake cleaning fluid.

  1. Raise and support the car. Remove the wheel. Remove the brake shoes by following the Brake Shoe Replacement procedure.
  2.  
  3. Remove dirt from around the wheel cylinder inlet and pilot. Disconnect the inlet tube.
  4.  
  5. Remove the wheel cylinder retaining bolts. Remove the wheel cylinder.
  6.  
  7. To install, place wheel cylinder into position and install the retaining bolts. Torque the retaining bolts to 13 ft. lbs. (18 Nm).
  8.  
  9. Connect the inlet tube and torque 18 ft. lbs. (24 Nm). Complete installation by reversing the removal procedure. Bleed the brakes.
  10.  

OVERHAUL



Overhaul kits for wheel cylinders are readily available. When rebuilding and installing wheel cylinders, avoid getting any contaminants into the system. Always install clean, new high quality brake fluid. If dirty or improper fluid has been used, it will be necessary to drain the entire system, flush the system with proper brake fluid, replace all rubber components, refill, and bleed the system.

  1. Remove the wheel cylinder by referring to the Wheel Cylinder Removal procedure.
  2.  
  3. Remove the rubber boots from the cylinder ends with pliers. Discard the boots. Remove and discard the pistons and cups.
  4.  
  5. Wash the cylinder and metal parts in denatured alcohol or clean brake fluid.
  6.  


CAUTION
Never use a mineral based solvent such as gasoline, kerosene, or paint thinner for cleaning purposes. These solvents will swell rubber components and quickly deteriorate them.

  1. Allow the parts to air dry or use compressed air. Do not use rags for cleaning since lint will remain in the cylinder bore.
  2.  
  3. Inspect the piston and replace it if it shows scratches.
  4.  
  5. Lubricate the cylinder bore and counterbore with clean brake fluid.
  6.  
  7. Install the seals (flat side out) and then the pistons (flat side in).
  8.  
  9. Insert new boots into the counterbores by hand. Do not lubricate the boots.
  10.  
  11. To install the wheel cylinder refer to the Wheel Cylinder Installation procedure.
  12.  

 
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