GM: Electra/Park Avenue/Ninety-Eight 1990-1993

Adjustments

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DISC BRAKES



The front disc brakes are fully self-adjusting. Adjustments are neither necessary nor possible.

DRUM BRAKES





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Fig. Fig. 1 Use of a drum micrometer

Under normal conditions, the drum brakes self-adjust anytime the brakes are applied, with no vehicle motion required. This system works well and manual adjustment is usually unnecessary. Adjustment will be required when new brake shoes are installed however.

  1. Raise and support the car safely.
  2.  
  3. Mark the relation of wheel to studs, so you install it in the same location.
  4.  
  5. Remove the wheel and tire assembly.
  6.  
  7. Remove the brake drum.
  8.  
  9. Make certain the parking brake is off and the brake shoes are sitting against the stops. If not, readjust the parking brake.
  10.  
  11. Using a drum micrometer, turn the star wheel on the adjuster until the outside diameter of the shoes is about 0.050 inch less than the inside diameter of the drum. Go slow; do not over-adjust or force the drum on. It's very difficult to remove the drum on an over adjusted system.
  12.  
  13. If a drum micrometer is not available, adjust the starwheel through the hole in the backing plate with a brake spoon while turning the drum. When very light contact is heard, stop turning the starwheel. Again, go slow; do not over-adjust. It's very difficult to remove the drum on an over-adjusted system.
  14.  
  15. Torque lug nuts to 100 ft. lbs. (140 Nm) and lower vehicle.
  16.  

 
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