Most all Peterbilt make and model trucks come equipped with adjustable slack adjusters. The slack adjusters are the main components that compress and retract the brake shoes away from the brake drums. When air is applied to the brakes, the slack adjuster compresses the brake shoes to the brake drum. When the air is released from the air brakes, the brake shoes retract from the brake drums. Excessive use will cause the brake shoes to wear down and come out of adjustment. The brake shoes will then need to be adjusted to keep the brakes working properly.
Things You’ll Need
Wheel chocks, 1/2-inch drive ratchet, 1/2-inch drive socket set, Flashlight