Mitsubishi Pick-ups and Montero 1983-1995 Repair Guide

Brake Disc (Rotor)



  1. Raise and safely support the vehicle on jackstands.
  3. Remove the wheel(s).
  5. Remove the rear brake caliper and mount (brake assembly) following procedures given previously in this section, but with out disconnecting the hydraulic line. Suspend the assembly with wire; do not allow the unit to hang by the brake line.
  7. Make mating marks to show the relationship between the brake disc and hub; pull the disc off the hub.
  9. Slide the rear brake disc onto the rear axle lug studs so that the matchmarks are aligned.
  11. Install the rear brake caliper to the disc and brake mount-refer to the procedures found in this section.


Brake discs should be inspected for thickness at a number of spots around the braking surface with a micrometer. If the thickness AT ANY POINT is less than the minimum given in the Brake Specifications Chart, the disc must be replaced. Roughness or significant grooving is also reason to replace the disc.

The disc should also be checked for run-out. With the disc installed (hold it with two lug nuts if necessary), mount a dial indicator to the shock and zero it with the tip in contact with the braking surface on the disc about 0.60 in. (15mm) from the edge. Rotate the disc slowly. Read the indicator; the limit for run-out is 0.006 in. (0.15mm). The disc must be replaced if run-out exceeds this amount.