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

Brake Disc (Rotor)

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REMOVAL & INSTALLATION



  1. Raise the vehicle, support it with jackstands, and remove the wheel and tire assembly.
  2.  
  3. Remove the brake caliper as previously outlined.
  4.  
  5. Remove the brake disc.
  6.  

To install:
  1. Install the disc.
  2.  
  3. Install the caliper as described earlier.
  4.  

INSPECTION



  1. Check the disc for any obvious defects such as excessive rust, chipping, or deep scoring. Light scoring is normal on disc brakes.
  2.  
  3. Make sure there is no wheel bearing play and then check the disc for runout as follows:
  4.  
  5. Install a dial indicator on the caliper so that its feeler will contact the disc about 1 in. below its outer edge.
  6.  
  7. Turn the disc and observe the runout reading. If the reading exceeds 0.002 in. (0.05mm), the disc should be replaced.
  8.  

All brake rotors (discs) have a minimum thickness dimension cast into them, on the hub between the lugs. This is the minimum wear dimension and not a refinish dimension. Do not reuse a brake rotor that will not meet specifications. Replace with a new rotor.

Refinishing of brake rotors can be handled at machine shops equipped for brake work.

 
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