Dodge Omni/Horizon/Rampage 1978-1989 Repair Guide

Brake Disc (Rotor)



  1. Raise and support the car.

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Fig. Fig. 1 Remove the caliper ...

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Fig. Fig. 2 Remove the disc from the studs

  1. Take off the wheels.
  3. Remove the caliper, then suspend it from a wire.
  5. Remove the brake disc from the drive flange studs.

To install:

  1. Install the brake disc on the drive flange studs.
  3. Install the caliper.
  5. Seat the wheels, install the lug nuts.
  7. Lower the vehicle, then tighten the lug nuts.

The pedal must give resistance at the normal position before attempting to drive the car. Drive the car at moderate speeds in an isolated area in order to apply the brakes several times to test the system and seat the new linings.


Light scoring is acceptable. Heavy scoring or warping will necessitate refinishing or replacement of the disc. The brake disc must be replaced if cracks or burned marks are evident.

Check the thickness of the disc. Measure the thickness at 12 equally spaced points 1 in. (25mm) from the edge of the disc. If thickness varies more than 0.001 in. (0.0125mm) the disc should be refinished, provided equal amounts are out from each side and the thickness does not fall below 0.4 in. (11mm).

Check the run-out of the disc. Total run-out of the disc installed on the car should not exceed 0.001 in. (0.0125mm). The disc can be resurfaced to correct minor variations as long as equal amounts are cut from each side and the thickness is at least 0.4 in. (11mm) after resurfacing.

Check the run-out of the hub (disc removed). It should not be more than 0.002 in. (0.05mm). If so, the hub should be replaced.