Drum brakes adjust themselves automatically, but the self-adjuster mechanism often sticks due to brake dust and road grime. To adjust the brakes manually, you insert a brake adjustment tool through a slot in the backing plate. The angled tip fits into the teeth of the star wheel adjuster. Prying the tool turns the wheel, expanding or contracting the brake shoes. This lets you adjust the brake clearance without taking the wheel and drum off.
Mechanic Glossary
Drum Brake Adjustment Tool
A flat, curved pry bar, also known as a brake spoon, used to turn the star wheel adjuster in drum brake assemblies.
Frequently Asked Questions
This depends on the vehicle. Usually, prying downward on the tool expands the shoes. If the wheel locks, pry in the opposite direction to loosen it.
A flathead screwdriver is straight and will hit the axle flange or backing plate. The brake spoon's curved shape lets you reach the star wheel teeth at an angle.
Spin the wheel by hand. You should hear a light, consistent scraping sound as the shoes drag slightly against the drum, but the wheel should spin freely.