Ford Mustang 1989-1993 Repair Guide

Brake Rotor



  1. Raise and safely support the vehicle. Remove the wheel.
  3. Remove the caliper but do not disconnect the brake hose. Suspend the caliper inside the fender with wire. Do not allow the caliper to hang by the hose.
  5. Remove the grease cap from the hub and remove the cotter pin, locknut, adjusting nut and flat washer.
  7. Remove the outer bearing cone and roller assembly; remove the hub and rotor assembly.
  9. Inspect the rotor for scoring and wear. Replace or machine as necessary. If machining, observe the minimum thickness specification.
  11. Installation is the reverse of removal. Make sure the grease in the hub is clean and adequate. Adjust the wheel bearings.


See Figures 1 and 2

Click image to see an enlarged view

Fig. Fig. 1: The brake rotor service limits are stamped into the rotor

Click image to see an enlarged view

Fig. Fig. 2: Check the rotor for deep grooves and scoring

If the rotor is deeply scarred or has shallow cracks, it may be refinished on a brake lathe.

A minimum thickness of 0.972 in (24.68 mm) must be maintained on 5.0L vehicles, and 0.810 in. (20.5 mm) must be maintained on 2.3L vehicles. If the damage cannot be corrected by grinding to these minimums, the rotor must be replaced.

The finished braking surfaces of the rotor must be parallel within 0.007 in (0.18 mm) and lateral run-out must not be more than 0.003 in. (0.076 mm) on the inboard surface in a 5 inch (127 mm) radius.