GM Camaro 1982-1992 Repair Guide

Wheel Cylinders

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REMOVAL & INSTALLATION



See Figures 1, 2 and 3



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Fig. Fig. 1: Wheel cylinder removal using 2 awls



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Fig. Fig. 2: Wheel cylinder removal using the special tool



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Fig. Fig. 3: Wheel cylinder installation


CAUTION
Brake shoes may 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. Using 2 awls, 1 / 8 in. (3mm) in diameter, or J29839, remove the wheel cylinder retainer. Insert the awls into the access slots between the wheel cylinder pilot and retainer. Simultaneously, bend both tabs away from each other. Remove the wheel cylinder.
  6.  

To install:
  1. Place wheel cylinder into position and place a block of wood between it and the axle flange. Install a new retainer over the end of the wheel cylinder. Using a 1 1 / 8 in. 12-point socket with an extension, drive the new retainer into position.
  2.  
  3. Connect the inlet tube and torque 120-280 inch lbs. (13.6-20 Nm). Complete installation by reversing the removal procedure. Bleed the brakes.
  4.  

OVERHAUL



See Figures 4 through 13

Wheel cylinder overhaul kits may be available, but often at little or no savings over a reconditioned wheel cylinder. It often makes sense with these components to substitute a new or reconditioned part instead of attempting an overhaul.

If no replacement is available, or you would prefer to overhaul your wheel cylinders, the following procedure may be used. When rebuilding and installing wheel cylinders, avoid getting any contaminants into the system. Always use 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, then refill and bleed the system.

  1. Remove the wheel cylinder from the vehicle and place on a clean workbench.
  2.  
  3. First remove and discard the old rubber boots, then withdraw the pistons. Piston cylinders are equipped with seals and a spring assembly, all located behind the pistons in the cylinder bore.
  4.  



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Fig. Fig. 4: Remove the outer boots from the wheel cylinder

  1. Remove the remaining inner components, seals and spring assembly. Compressed air may be useful in removing these components. If no compressed air is available, be VERY careful not to score the wheel cylinder bore when removing parts from it. Discard all components for which replacements were supplied in the rebuild kit.
  2.  



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Fig. Fig. 5: Compressed air can be used to remove the pistons and seals



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Fig. Fig. 6: Remove the pistons, cup seals and spring from the cylinder

  1. Wash the cylinder and metal parts in denatured alcohol or clean brake fluid.
  2.  



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Fig. Fig. 7: Use brake fluid and a soft brush to clean the pistons ...



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Fig. Fig. 8: ... and the bore of the wheel cylinder


WARNING
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.  



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Fig. Fig. 9: Once cleaned and inspected, the wheel cylinder is ready for assembly

  1. Lubricate the cylinder bore and seals using clean brake fluid.
  2.  
  3. Position the spring assembly.
  4.  
  5. Install the inner seals, then the pistons.
  6.  



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Fig. Fig. 10: Lubricate the cup seals with brake fluid



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Fig. Fig. 11: Install the spring, then the cup seals in the bore



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Fig. Fig. 12: Lightly lubricate the pistons, then install them

  1. Insert the new boots into the counterbores by hand. Do not lubricate the boots.
  2.  



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Fig. Fig. 13: The boots can now be installed over the wheel cylinder ends

  1. Install the wheel cylinder.
  2.  

 
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