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GM Prizm/Nova 1985-1993 Repair Guide

Brake Rotor

Imprimir

REMOVAL & INSTALLATION



  1. Elevate and safely support the car. If only the front end is supported, set the parking brake and block the rear wheels.
  2.  
  3. Remove the wheel.
  4.  
  5. Remove the brake caliper from its mount and suspend it out of the way. Don't disconnect the hose and don't let the caliper hang by the hose. Remove the brake pads with all the clips, shims, etc.
  6.  
  7. Install all the lug nuts to hold the rotor in place. If the nuts are open at both ends, it is helpful to install them backwards (tapered end out) to secure the disc. Tighten the nuts a bit tighter than finger tight, but make sure all are at approximately the same tightness.
  8.  
  9. Perform the run-out and thickness measurements explained in Inspection. Run-out must be measured with the rotor mounted on the car. Thickness measurements can be made either on or off the car.
  10.  
  11. Remove the 2 bolts holding the caliper mounting bracket to the steering knuckle. These bolts will be tight. Remove the 4 lug nuts holding the rotor.
  12.  
  13. Remove the bracket from the knuckle. Before removing the rotor, make a mark on the rotor indexing 1 wheel stud to 1 hole in the rotor. This assures the rotor will be re-installed in its original position, serving to eliminate minor vibrations in the brake system.
  14.  
  15. When reinstalling, make certain the rotor is clean and free of any particles of rust or metal from resurfacing. Observe the index mark made earlier and fit the rotor over the wheel lugs. Install 2 lug nuts to hold it in place.
  16.  
  17. Install the caliper mounting bracket in position and tighten its bolts to 65 ft. lbs. (88 Nm).
  18.  
  19. Install the brake pads and the hardware.
  20.  
  21. Install the caliper. Tighten the mounting bolts to 18 ft. lbs. (25 Nm) for 1985-92 and 25 ft. lbs. (34 Nm) for 1993.
  22.  
  23. Install the wheel and lower the car to the ground.
  24.  

INSPECTION



Run-out

See Figure 1

Before measuring the run-out on the front discs, confirm that the front wheel bearing play is within specification.

  1. Elevate and safely support the car. If only the front end is supported, set the parking brake and block the rear wheels.
  2.  
  3. Remove the wheel.
  4.  
  5. Remove the brake caliper from its mount and suspend it out of the way. Don't disconnect the hose and don't let the caliper hang by the hose. Remove the brake pads with all the clips, shims, etc.
  6.  
  7. Install all the lug nuts to hold the rotor in place. If the nuts are open at both ends, it is helpful to install them backwards (tapered end out) to secure the disc. Tighten the nuts a bit tighter than finger tight, but make sure all are at approximately the same tightness.
  8.  
  9. Mount a dial indicator with a magnetic or universal base on the strut so that the tip of the indicator contacts the rotor about 1 / 2 in. from the outer edge.
  10.  



Click image to see an enlarged view

Fig. Fig. 1: Measuring the rotor run-out

  1. Zero the dial indicator. Turn the rotor 1 complete revolution and observe the total indicated run-out.
  2.  
  3. If the run-out exc