GM Cadillac 1967-1989 Repair Guide

Caliper

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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.

REMOVAL & INSTALLATION



See Figures 1, 2, 3, 4, 5, 6, 7, 8 and 9

  1. Raise the car and support it on jackstands.
  2.  
  3. Remove the tire and wheel assembly from the side on which the caliper is being removed.
  4.  
  5. Disconnect the brake hose at the support bracket. Tape the end of the line to prevent contamination.
  6.  
  7. Remove the two caliper retaining bolts and lift off the caliper.
  8.  
  9. Remove the brake pads and identify them as inboard or outboard if they are being reused.
  10.  
  11. Remove the U-shaped retainer from the hose fitting and pull the hose from the bracket. Remove the caliper assembly.
  12.  

To install:
  1. Install the brake pads. If the same pads are being reused, return them to their original places (outboard or inboard) as marked during removal. New pads will usually have an arrow on the back indicating the direction of disc rotation. Install caliper assembly and install retaining bolts.
  2.  
  3. Install the brake hose into the caliper, passing the female end through the support bracket.
  4.  
  5. Make sure that the tube line is clean and connect the brake line nut to the caliper.
  6.  
  7. Install the hose fitting into the support bracket and install the U-shaped retainer. Turn the steering wheel from side to side to make sure that the hose doesn't interfere with the tire. If it does, turn the hose end one or two points in the bracket until the interference is eliminated.
  8.  
  9. After performing the above check, install the steel tube connector and tighten it.
  10.  
  11. Bleed the brakes.
  12.  
  13. Install the wheels and lower the car.
  14.  



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Fig. Fig. 1: Exploded view of the disc brake assembly



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Fig. Fig. 2: View of the disc brake assembly



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Fig. Fig. 3: Cleaning the disc brake caliper and rotor



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Fig. Fig. 4: Compressing the disc brake caliper with C-clamp



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Fig. Fig. 5: Removing the disc brake caliper bolts or pins



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Fig. Fig. 6: View of the disc brake caliper bolts or pins



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Fig. Fig. 7: Removing the disc brake caliper from the brake rotor



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Fig. Fig. 8: Removing the front disc brake (front) pad - note support the brake caliper



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Fig. Fig. 9: Removing the front disc brake (back) pad - note support the brake caliper

OVERHAUL



See Figures 10, 11, 12, 13 and 14

  1. Perform the removal steps for pad replacement.
  2.  
  3. Disconnect the brake hose and plug the line.
  4.  
  5. Remove the U-shaped retainer from the fitting.
  6.  
  7. Pull the hose from the frame bracket and remove the caliper with the hose attached.
  8.  
  9. Clean the outside of the caliper with denatured alcohol.
  10.  
  11. Remove the brake hose and discard the copper gasket.
  12.  
  13. Remove the brake fluid from the caliper.
  14.  
  15. Place clean rags inside the caliper opening to catch the piston when it is released.
  16.  
  17. Apply compressed air to the caliper fluid inlet hole and force the piston out of its bore. Do not blow the piston out; use just enough pressure to ease it out.
  18.  
  19. Use a screwdriver to pry the boot out of the caliper. Avoid scratching the bore.
  20.  
  21. Remove the piston seal from its groove in the caliper bore. Do not use a metal tool of any type for this operation.
  22.  

Replace (do not reuse) the boot, piston seal, rubber bushings, and sleeves.

  1. Blow out all passages in the caliper and bleeder valve. Clean the piston and piston bore with fresh brake fluid.
  2.  
  3. Examine the piston for scoring, scratches, or corrosion. If any of these conditions exist, the piston must be replaced because it is plated and cannot be refinished.
  4.  
  5. Examine the bore for the same defects. Light rough spots may be removed by rotating crocus cloth, using finger pressure, in the bore. Do not polish with an in-and-out motion or use any other abrasive.
  6.  
  7. Lubricate the piston bore and the new rubber parts with fresh brake fluid. Position the seal in the piston bore groove.
  8.  
  9. Lubricate the piston with brake fluid and assemble the boot into the piston groove so that the fold faces the open end of the piston.
  10.  
  11. Insert the piston into the bore, taking care not to unseat the seal.
  12.  
  13. Force the piston to the bottom of the bore. Seat the boot lip around the caliper counterbore. Proper seating of the boot is very important for sealing out contaminants.
  14.  
  15. Install the brake hose into the caliper with a new copper gasket.
  16.  
  17. Lubricate the new sleeves and rubber bushings. Install the bushings in the caliper ears. Install the sleeves so that the end toward the disc pad is flush with the machined surface.
  18.  

Lubrication of the sleeves and bushings is essential to insure the proper operation of the sliding caliper design.

  1. Install the shoe support spring in the piston.
  2.  
  3. Install the disc pads in the caliper and remount the caliper.
  4.  
  5. Reconnect the brake hose to the steel brake line. Install the retainer clip. Bleed the brakes.
  6.  
  7. Replace the wheels, check the brake fluid level, and roadtest the vehicle.
  8.  



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Fig. Fig. 10: Piston removal using compressed air



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Fig. Fig. 11: Exploded view of the front disc brake caliper - 1986-89 Eldorado and Seville



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Fig. Fig. 12: Exploded view of the front disc brake caliper - except 1986-89 Eldorado and Seville



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Fig. Fig. 13: Removing the brake caliper piston - support the piston-to-caliper with wood block



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Fig. Fig. 14: Removing the brake caliper dust seal

 
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