Ford Mustang 1989-1993 Repair Guide

Rear Brake Drum


Brake linings contain asbestos, which has been determined to be a cancer-causing agent. Never clean the brake surfaces with compressed air. Avoid inhaling dust from any brake surface. When cleaning brake surfaces, use a commercially available brake cleaning fluid.


See Figures 1 and 2

Click image to see an enlarged view

Fig. Fig. 1: Back off the brake shoe adjustment and the drum should slide right off

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Fig. Fig. 2: Clean the surface of the hub flange. A small amount of anti-sieze compound will prevent the drum from corroding to the hub

  1. Raise and safely support the vehicle.
  3. Remove the wheel and tire assembly.
  5. Remove the drum retaining nuts and remove the brake drum.

If the drum will not come off, pry the rubber plug from the backing plate. Insert a narrow rod through the hole in the backing plate and disengage the adjusting lever from the adjusting screw. While holding the adjustment lever away from the screw, back off the adjusting screw with a brake adjusting tool.

  1. Inspect the brake drum for scoring and wear. Replace or machine as necessary. If machining, observe the maximum diameter specification.
  3. Installation is the reverse of removal.


See Figure 3

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Fig. Fig. 3: The brake drum maximum diameter will be stamped into the drum

Check that there are no cracks or chips in the braking surface. Excessive bluing indicates overheating and a replacement drum is needed. The drum can be machined to remove minor damage and to establish a rounded surface on a warped drum. Never exceed the maximum oversize of the drum when machining the braking surface. The minimum inside diameter is stamped on the rim of the drum.