GM Lumina/Grand Prix/Cutlass Supreme/Regal 1988-1996

Brake Rotor

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REMOVAL & INSTALLATION



  1. Disconnect the negative battery cable.
  2.  
  3. Remove 2 / 3 of the brake fluid from the brake reservoir using a clean syringe or equivalent.
  4.  
  5. Raise and safely support the vehicle with jackstands.
  6.  
  7. Mark the relationship of the wheel to the hub and bearing assembly.
  8.  
  9. Remove the tire and wheel assembly.
  10.  
  11. Remove the caliper and suspend it from the strut with a wire hook or suitable piece of wire. Do NOT disconnect the brake hose or allow the caliper to hang from the brake line!
  12.  
  13. Remove the rotor assembly.
  14.  

To install:
  1. Install the brake rotor over the hub assembly.
  2.  
  3. Install the brake caliper as outlined in this section.
  4.  
  5. Install the wheel and tire assembly.
  6.  
  7. Carefully lower the vehicle, then fill the master cylinder reservoir to the FULL level with the correct type of DOT 3 brake fluid from a clean, unsealed container.
  8.  
  9. Firmly depress the brake pedal three times before moving the vehicle.
  10.  

INSPECTION



Thickness Variation Check

The thickness variation can be checked by measuring the thickness of the rotor at four or more points. All of the measurements must be made at the same distance from the edge of the rotor. A rotor the varies by more than 0.0005 inch (0.0127mm) can cause a pulsation in the brake pedal. If these measurement are excessive, the rotor should be refinished or replaced.

Lateral Runout Check
  1. Remove the caliper and hang from the body with a piece of wire. Install two inverted lug nuts to retain the rotor.
  2.  
  3. Install a dial indicator to the steering knuckle so that the indicator button contacts the rotor about 1 in. (25mm) from the rotor edge.
  4.  
  5. Zero the dial indicator.
  6.  
  7. Move the rotor one complete revolution and observe the total indicated runout.
  8.  
  9. If the rotor runout exceeds 0.0015 inch (0.040mm) have the rotor refinished or replaced.
  10.  

Refinishing Brake Rotors

All brake rotors have a minimum thickness dimension cast onto them. Do NOT use a brake rotor that will not meet minimum thickness specifications in the "Brake Specifications'' chart at the end of this section.

Accurate control of rotor tolerances is necessary for proper brake performance and safety. Machining of the rotor should be done by a qualified machine shop with the proper machining equipment.

The optimum speed for refinishing the rotor surface is a spindle speed of 200 rpm. Crossfeed for rough cutting should range from 0.006-0.010 in. (0.152-0.254mm) per revolution. The finish cuts should be made at crossfeeds no greater than 0.002 in. (0.05mm) per revolution.

 
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