In a truck air brake system the air brake chamber plays a vital role in
the safety of a truck.
Brake Chambers convert the energy of compressed air into mechanical
force and motion. Through the air brake chamber's connection to a slack
adjuster and then to a brake camshaft, this force and motion actuates the
The camshaft is twisted between the brake shoes, separating them to
create friction inside the air brake drum.
This friction causes the wheel to slow and stop the wheel and the
Brake Chambers are available in several sizes, providing a wide range of
output forces and strokes.
The many different size brake chambers are identified by numbers,
which indicate the effective area of the diaphragm.
For example, a Type 30 brake chamber has a 30 square inch effective
area diaphragm size.
Parking Spring brake chambers apply the brakes by
means of a large coil spring that provides enough force to hold the brakes in
the applied position, instead of using air to apply the brakes.