GM Firebird 1967-1981 Repair Guide

Brake Disc

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INSPECTION



See Figure 1

Click image to see an enlarged view

Fig. Fig. 1: Measure the disc rotor run-out with a dial indicator gauge, mounted as shown

  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 in. below its outer edge.
  4.  
  5. Turn the disc and observe the run-out reading. If the reading exceeds 0.002 in., the disc should be replaced.
  6.  
  7. Minimum thickness dimensions are cast into the caliper for reference.
  8.  

REMOVAL & INSTALLATION



See Figure 2

Click image to see an enlarged view

Fig. Fig. 2: Exploded view of the front rotor mounting

  1. Raise the car, support it with jackstands, and remove the wheel and tire assembly.
  2.  
  3. Remove the brake caliper as previously outlined in this section.
  4.  
  5. Drill out the 5 rivets holding the disc to the hub.
  6.  
  7. Remove the disc.
  8.  
  9. Remove the rivet stubs from the hub.
  10.  
  11. Install the disc on the hub, aligning the lug bolts with the holes in the disc.
  12.  
  13. Install the brake caliper and shoes as previously outlined in this section.
  14.  
  15. Bleed the brakes, install the wheel, and lower the car.
  16.  

 
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