GM Celebrity/Century/Ciera/6000 1982-1996 Repair Guide

Adjustments

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DISC BRAKES



The front disc brakes are self-adjusting. No adjustments are necessary or possible.

DRUM BRAKES



The drum brakes are designed to self-adjust when applied with the car moving in reverse. However, they can also be adjusted manually. This manual adjustment should also be performed whenever the linings are replaced.

Never adjust the parking brake cable, until after the regular service brakes have been adjusted.

Adjustment Through Drum
  1. To remove the wheel, loosen all the lug nuts at least one full turn, before raising the car.
  2.  
  3. Raise and support the vehicle.
  4.  
  5. Remove the lug nuts and the wheel.
  6.  
  7. Use a punch to knock out the stamped area on the brake drum. If this is done with the drum installed on the car, the drum must then be removed to clean out all metal pieces. After adjustments are complete, obtain a hole cover from your dealer (part no. 4874119 or the equivalent) to prevent entry of dirt and water into the brakes.
  8.  
  9. Use an adjusting tool especially made for the purpose to turn the brake adjusting screw star wheel.
  10.  

Keep turning the drum as you are adjusting it or you may overtighten the shoes against the drum.

  1. Expand the shoes until there is a slight drag.
  2.  
  3. Back off the adjusting screw a few notches, if too tight. If the shoes still are dragging lightly, back off the adjusting screw one or two additional notches. If the brakes still drag, the parking brake adjustment is incorrect or the parking brake is applied. Disengage the parking brake or loosen the adjusting nut as necessary.
  4.  
  5. Install the hole cover into the drum.
  6.  
  7. Check the parking brake adjustment.
  8.  
  9. Install the wheel, hand-tighten the lug nuts. Lower the vehicle, then tighten the lug nuts to 100 ft. lbs. (136 Nm).
  10.  

Adjustment Through Backing Plate

On some models, no marked area or stamped area is present on the drum. In this case, a hole must be drilled in the backing plate:

  1. To remove the wheel, loosen all the lug nuts at least one full turn, before raising the car.
  2.  
  3. Raise and support the vehicle.
  4.  
  5. Remove the lug nuts and the wheel.
  6.  
  7. These backing plates have two round flat areas in the lower half through which the parking brake cable is installed. Drill a 1 / 2 in. (13mm) hole into the round flat area on the backing plate opposite the parking brake cable. This will allow access to the star wheel.
  8.  
  9. After drilling the hole, remove the drum and remove all metal particles. Install a hole plug (part no. 4874119 or the equivalent) to prevent the entry of water or dirt.
  10.  
  11. Use an adjusting tool especially made for the purpose to turn the brake adjusting screw star wheel.
  12.  

Keep turning the drum as you are adjusting it or you may overtighten the shoes against the drum.

  1. Expand the shoes until there is a slight drag.
  2.  
  3. Back off the adjusting screw a few notches, if too tight. If the shoes still are dragging lightly, back off the adjusting screw one or two additional notches. If the brakes still drag, the parking brake adjustment is incorrect or the parking brake is applied. Disengage the parking brake or loosen the adjusting nut as necessary.
  4.  
  5. Install the hole cover into the drum.
  6.  
  7. Check the parking brake adjustment.
  8.  

Another option on these models is simply to remove the drum, adjust the shoe and try the drum on. If the drum fit is still loose, adjust the shoes out slightly more and repeat. Using this method may prove to be difficult, due to a ridge that forms on the outer edge of the drum.

  1. Install the wheel, hand-tighten the lug nuts. Lower the vehicle, then tighten the lug nuts to 100 ft. lbs. (136 Nm).
  2.  

 
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