GM Caprice 1990-1993 Repair Guide

Brake Pads

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INSPECTION



The pad thickness should be inspected every time that the tires are removed for rotation. The outer pad can be checked by looking in each end, which is the point at which the highest rate of wear occurs. The inner pad can be checked by looking down through the inspection hole in the top of the caliper. If the thickness of the pad is worn to within 0.030 inch (0.76mm) of the rivet at either end of the pad, all the pads should be replaced.

Always replace all pads on both front wheels at the same time. Failure to do so will result in uneven braking action and premature wear.

REMOVAL & INSTALLATION



See Figures 1 through 9


CAUTION
Brake pads and 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.



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Fig. Fig. 1: Install a C-clamp and compress the piston into the caliper before removing the assembly



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Fig. Fig. 2: Caliper removal - loosen upper and lower caliper retaining bolts



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Fig. Fig. 3: Caliper removal - remove upper and lower retaining bolts

  1. Siphon 2 / 3 of the brake fluid from the master cylinder reservoir. Loosen the wheel lug nuts and raise the car. Remove the wheel.
  2.  
  3. Position a C-clamp across the caliper and press on the pads. Tighten it until the caliper piston bottoms in its bore.
  4.  

If you haven't removed some brake fluid from the master cylinder, it may overflow when the piston is retracted.

  1. Remove the C-clamp.
  2.  

The single piston design caliper uses either an Allen® head bolt or Torx® head bolt to secure the caliper to the mounting bracket. Do not use an Allen® socket in place of the Torx® socket, otherwise damage to the bolt may occur.

  1. Remove the mounting bolts. Inspect the bolts for corrosion and replace as necessary.
  2.  



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Fig. Fig. 4: Caliper removal - lift caliper assembly from mounting bracket



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Fig. Fig. 5: Remove brake pads from caliper assembly



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Fig. Fig. 6: Support caliper assembly out of the way using wire.

  1. Remove the caliper from the steering knuckle and suspend it from the body of the car with a length of wire. Do not allow the caliper to hang by its hose.
  2.  
  3. Remove the pad retaining springs and remove the pads from the caliper.
  4.  
  5. Remove the caliper bolt sleeves and the rubber bushings from the mounting bolt holes.
  6.  



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Fig. Fig. 7: Disc brake pads and caliper assembly retaining bolts



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Fig. Fig. 8: Install the retaining spring on the inboard (piston side) pad



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Fig. Fig. 9: Bend the outboard pad ears to ensure the pad does not vibrate in caliper mounting, causing noise during braking

To install:
  1. Obtain a pad replacement kit. Lubricate and install the new sleeves and bushings with a light coat of silicone grease.
  2.  
  3. Install the retainer spring on the inboard pad. Apply a suitable anti-squeak paste to the back of the pads. Do not apply anything to the pad-to-rotor contact surface.
  4.  

A new spring should be included in the pad replacement kit.

  1. Install the new inboard pad into the caliper with the wear sensor at the leading of the shoe during forward wheel rotation.
  2.  
  3. Install the outboard pad into the caliper.
  4.  
  5. Use a large pair of slip joint pliers to bend the outer pad ears down over the caliper. The outer pad should not be loose when properly attached to the caliper.
  6.  
  7. Install the caliper onto the steering knuckle. Tighten the mounting bolts to 38 ft. lbs. (51 Nm). Install the wheel and lower the car. Fill the master cylinder to its proper level with a good quality brake fluid.
  8.  
  9. Pump the brake pedal slowly and firmly with the engine running before attempting to move the vehicle; bleed the brakes as required.
  10.  

 
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