GM Firebird 1982-1992 Repair Guide

Brake Disc (Rotor)

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REMOVAL & INSTALLATION



See Figures 1, 2, 3, 4 and 5



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Fig. Fig. 1: Breaking loose the dust cap



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Fig. Fig. 2: Removing the dust cap



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Fig. Fig. 3: Removing the cotter pin



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Fig. Fig. 4: Removing the spindle nut



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Fig. Fig. 5: Removing the washer


CAUTION
Brake pads 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.

  1. Remove the caliper by following instructions of caliper removal procedure.
  2.  
  3. Remove dust cap, cotter pin, castle nut, thrust washer and outside wheel bearing. Pull the disc/hub assembly from the steering knuckle.
  4.  

To install:
  1. Position the disc/hub assembly to the spindle/steering knuckle. Install the outside wheel bearing, thrust washer and castle nut. Tighten the castle nut until the bearing is snug. Back off the nut 1 / 4 turn. Refer to Wheel Bearing Removal. For details on wheel bearing removal, installation, and adjustment. Install a new cotter pin and dust cap.
  2.  
  3. Install the brake caliper.
  4.  

INSPECTION



See Figure 6



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Fig. Fig. 6: Checking disc runout

  1. Check the rotor surface for wear, scoring, grooves or rust pitting. Rotor damage can be corrected by refacing, consult your local garage or machine shop. If the damage exceeds the minimum thickness, which is stamped on the rotor, replace the rotor.
  2.  
  3. Check the rotor parallelism at four or more points around the circumference, it must not vary more than 0.0005 in. (0.013mm). Make all measurements at the same distance in from the edge of the rotor. Refinish the rotor if it fails to meet specification.
  4.  
  5. Measure the disc runout with a dial indicator. If runout exceeds 0.004 in. (0.10mm), and the wheel bearings are okay (runout is measured with the disc on the car), the rotor must be refaced or replaced.
  6.  

 
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