Jeep CJ/Scrambler 1971-1986 Repair Guide

Brake Drum



See Figure 1

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

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Fig. Fig. 1: Component view of front drum brake components

The front brake drums are attached to the wheel hubs by five bolts. These bolts are also used for mounting the wheels on the hub. Press or drive out the bolts to remove the drum from the hub.

When placing the drum on the hub, make sure that the contacting surfaces are clean and flat. Line up the holes in the drum with those in the hub and put the drum over the shoulder on the hub. Insert five new bolts through the drum and hub and drive the bolts into place solidly. Place a round piece of stock approximately the diameter of the head of the bolt, in a vise. Next place the hub and drum assembly over it so that the bolt head rests on it. Then flatten the bolt head into the countersunk section of the hub with a punch.

The run-out of the drum face should be within 0.030 in. (0.8mm). If the run-out is found to be greater than 0.030 in. (0.8mm), it will be necessary to reset the bolts to correct the condition.

The left hand hub bolts have an L stamped on the head of the bolt. The left hand threaded nuts may have a groove cut around the hexagon faces, or the word LEFT stamped on the face.

Hubs with left hand threaded hub bolts are installed on the left hand side of the vehicle. Late production vehicles are equipped with right hand bolts and nuts on all four bolts.


Using a brake drum micrometer, check all drums. Should a brake drum be scored or rough, it may be reconditioned by grinding or turning on a lathe. Do not remove more than 0.030 in. (0.8mm) thickness of metal.

Use a clean cloth to clean dirt from the brake drums. If further cleaning is required, use soap and water. Do not use brake fluid, gasoline, kerosene or any other similar solvents.