Chevrolet Full-size Cars 1968-1978 Repair Guide

Brake Disc Rotor

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INSPECTION





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Fig. Fig. 1 Use a dial indicator to determine brake rotor run-out



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Fig. Fig. 2 Example of what run-out looks like, however, you may not be able to actually see the rotor wobble, unless run-out is extremely excessive



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Fig. Fig. 3 Measure the rotor in different spots to determine parallelism



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Fig. Fig. 4 A discard dimension is stamped on the disc hub

  1. Tighten the spindle nut to remove all wheel bearing play.
  2.  
  3. Install a dial indicator on the caliper so that its feeler will contact the disc about 1" below its outer edge.
  4.  
  5. Turn the disc and observe the run-out reading. If the reading exceeds 0.002" (0.004" total reading), the disc should be replaced.
  6.  
  7. Measure the thickness of the rotor at 5 points around the circumference. Tolerance is 0.005".
  8.  
  9. Minimum thickness dimensions are cast into the caliper for reference.
  10.  

REMOVAL & INSTALLATION



  1. Raise the vehicle and support it on safety stands. Remove the wheel and tire assembly.
  2.  
  3. Remove the brake caliper and brake pads. Position the brake caliper to the side.
  4.  
  5. Remove the dust cover, cotter pin and locknut. Remove the outer wheel bearing.
  6.  
  7. Remove the disc brake rotor from the spindle.
  8.  

To install:

  1. Install the disc brake rotor on the spindle. Install the outer wheel bearing.
  2.  
  3. Install the locknut. Adjust the wheel bearings.
  4.  
  5. Install the cotter pin and dust cover.
  6.  
  7. Install the brake caliper and brake pads.
  8.  
  9. Install the tire and wheel assembly. Lower the vehicle.
  10.  

 
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