During normal braking, compressed air is supplied through the air system and pressed into a brake caliper. This force is then applied to the brake pads to generate a braking force. The brake caliper also has an internal adjustment mechanism to increase application force through mechanical leverage.
Air disc brakes provide greater brake control and a shorter stopping distance. However, they are 30% - 40% more expensive than drum brakes. Disc brakes may also act as a parking brake.
Air disc chambers are round metal containers that convert the pressure of the air system into mechanical movement to apply brakes. Disc brakes are also designed to be less susceptible to brake fade.
The air disc brake caliper has a lever that pushes pistons that apply braking force to the brake pads. These brakes are also known as "S" cam brakes. The "S" shape on the camshaft forces the brake shoes apart. The brake pads are then pressed into the brake rotor.
Disc brakes require less maintenance and re-adjustment than drum brakes. However, a failure in the air disc brake chamber can result in a complete brake assembly replacement. It is important to inspect the brake chamber for signs of failure.
The brake chamber must be properly sealed to prevent leaks. It is also important to adjust the chamber and slack adjusters. This is particularly important for vehicles with heavy braking demands.
The brake chamber should be replaced every two to five years. It is important to inspect the chamber and slack adjusters regularly to ensure that they are adjusted correctly. If the brake is not adjusted correctly, it can significantly reduce the braking force.
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