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Brake shoes are the friction components used in drum brakes. They press outward against the inner surface of a rotating drum to slow a commercial vehicle. Many trucks use air-actuated drum brakes on the drive and trailer axles, where each shoe is a steel body with a bonded or riveted friction lining.
When the brakes are applied, the system forces the shoes against the inside of the drum, and the resulting friction converts the vehicle motion into heat. The lining material and contact area are matched to the axle load the vehicle is rated for. The shoes and the drum work as a matched pair.
The friction lining wears down with use. Shoes are replaced once the lining reaches its minimum thickness, which on many commercial vehicles is around 6 mm. Warning signs include a squeal as the lining nears the end of its life, a grinding noise once the metal contacts the drum, reduced braking response, and excessive brake dust. Uneven wear can point to poor adjustment or a drum problem. The drum is inspected whenever shoes are replaced, and shoes are replaced together on the same axle to keep braking balanced.
The correct shoe depends on the drum diameter, shoe width, vehicle model, axle position, and brake system type. Confirm the part against the vehicle specification before fitting.
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What is the difference between brake shoes and brake pads?
Shoes are used in drum brake systems and pads in disc brake systems. Many commercial vehicles use both, often disc brakes on the steer axle and drum brakes on the drive and trailer axles.
When should commercial truck brake shoes be replaced?
When the friction lining reaches its minimum thickness, around 6 mm on many vehicles, or when you notice squealing, grinding, or reduced braking. A qualified technician should measure and confirm.
Should the drum be replaced when the shoes are replaced?
Not always, but the drum should be inspected every time shoes are replaced. If it is worn past its limit, scored, or cracked, it should be replaced along with the shoes.
Why are brake shoes replaced as a set on an axle?
Replacing both keeps braking balanced across the axle. Mismatched shoes can make the vehicle pull or brake unevenly.
What does a grinding noise when braking mean?
It often means the friction lining has worn away and metal is contacting the drum. This needs immediate inspection and replacement to avoid damaging the drum.