GM Buick/Oldsmobile/Pontiac/Full-Size 1975-1990 Repair Guide

Brake Pads

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REMOVAL & INSTALLATION 2 / 3 of the brake fluid from the master cylinder.



  1. Siphon off
  2.  

The insertion of the thicker replacement pads will push the caliper piston back into its bore and will cause a full master cylinder to overflow.

  1. Raise the rear of the vehicle and support it with safety stands. Remove the wheel and tire assembly.
  2.  
  3. Remove the caliper as detailed later in this section.
  4.  
  5. Remove the outboard brake shoe and lining by unsnapping the shoe springs from the caliper holes.
  6.  
  7. From the inside of the caliper, press on the edge of the inboard brake shoe and tilt it outward so that it is released from the shoe retainer.
  8.  
  9. Remove the flexible two way check valve from the end of the piston assembly with a small screwdriver.
  10.  

If new linings are to be installed, remove the parking brake lever and bottom the piston in the caliper bore.

To install:
  1. Lubricate a new two way check valve with silicone fluid and press it into the end of the piston.
  2.  
  3. Install the inboard brake shoe. Make sure that the shoe retainer and the piston are positioned as shown in the illustration. The tabs on the retainer are different; rotate the retainer into position if necessary. The buttons on the backing of the shoe must engage the larger, D-shaped notches in the piston. The piston will be properly aligned when the larger notches are aligned with the caliper mounting bolt holes as shown. Engage the inboard edge of the shoe with the straight tabs on the retainer, press downward and snap the shoe under the S-shaped tabs.
  4.  
  5. Install the outboard brake shoe. The shoe is properly installed when the wear sensor is at the trailing edge of the shoe during forward rotation.
  6.  
  7. Be sure to snap both shoe springs into the caliper holes so that the back of the shoe is flat against the caliper.
  8.  
  9. Install the caliper.
  10.  
  11. Bleed the brakes, install the wheels and lower the vehicle.
  12.  

INSPECTION



Brake pads should be inspected once a year or at 7,500 miles, whichever occurs first. Check both ends of the outboard shoe, looking in at each end of the caliper; then check the lining thickness on the inboard shoe, looking down through the inspection hole. Lining should be more than 0.020 in. (0.5mm) on 1975-82 vehicles; 0.030 in. (0.76mm) on 1983 and later vehicles, thick above the rivet (so that the lining is thicker than the metal backing.). Keep in mind that any applicable state inspection standards that are more stringent take precedence. All four pads must be replaced if one shows excessive wear.

All 1979 and later models have a wear indicator that makes a noise when the linings wear to a degree where replacement is necessary. The spring clip is an integral part of the inboard shoe and lining. When the brake pad reaches a certain degree of wear, the clip will contact the rotor and produce a warning noise.

 
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