GM Cadillac 1967-1989 Repair Guide

Brake Disc

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REMOVAL & INSTALLATION



  1. Raise the car, support it with jackstands, and remove the wheel and tire assembly.
  2.  
  3. Remove the brake caliper as previously outlined.
  4.  
  5. Remove the dust cap and remove the wheel bearing nut after removing the cotter pin.
  6.  
  7. Remove the wheel bearing, hub, and disc assembly from the spindle.
  8.  
  9. Installation is the reverse order of removal. Adjust the wheel bearing as outlined in this section.
  10.  

INSPECTION



See Figures 1 and 2

  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 one inch below its outer edge.
  6.  
  7. Turn the disc and observe the runout reading. If the reading exceeds 0.002 in. (0.051mm), the disc should be replaced.
  8.  

All brake rotors (disc) 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.



Click image to see an enlarged view

Fig. Fig. 1: Checking brake disc runout with a dial indicator



Click image to see an enlarged view

Fig. Fig. 2: Discard dimension (.965) stamped on disc hub

 
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