![]() This causes friction, which slows the vehicle (and creates heat). To stop, the brake shoes and linings are pushed against the inside of the drum. The braking mechanism is inside the drum. Brake drums are located on each end of the vehicle’s axles. The parts of the brake are discussed below.īrake Drums, Shoes, and Linings. The most common type is the S-cam drum brake. ![]() The parts of these systems are discussed in greater detail in the following paragraphs.įoundation brakes are used at each wheel. If the vehicle you use for your road test does not have these components, your vehicle will not be considered as having an air brake system and you will have a “No Air Brakes” (“L”) restriction on your CDL.Ī full service brake application must deliver to all brake chambers not less than 90 percent of the air reservoir pressure remaining with the brakes applied (CVC §26502). For CDL purposes, a vehicle’s air brake system must meet the above definition and contain the following, which will be checked during the vehicle inspection test: Emergency brake system uses parts of the service and parking brake systems to stop the vehicle in a brake system failure.ĬDL Air Brake Requirements. ![]()
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