A drum brake chamber is a component of a heavy-duty vehicle's braking system. It is an enclosed metal cylinder that contains a diaphragm and a set of pushrods. The drum brake chamber is usually mounted on the back of a vehicle's brake spider or backing plate and is connected to the brake shoe assembly.
When the driver presses the brake pedal, air is forced into the chamber, which causes the diaphragm to move and push the pushrods outwards. The pushrods then apply pressure to the brake shoes, causing them to come into contact with the brake drum and slowing down the vehicle.
The drum brake chamber is an essential component of a heavy-duty vehicle's braking system and must be regularly inspected and maintained to ensure proper function. Common problems with the drum brake chamber include leaks, which can cause the brake system to fail, and worn diaphragms, which can reduce braking performance.