MD CDL Air Brakes case studies

The Maryland Commercial Driver's License Air Brakes Knowledge Test is the written exam a CDL applicant takes to remove the air brake restriction (the "L" restriction on a Maryland CDL, though always confirm the current restriction code with the MVA) so they can legally operate a commercial vehicle equipped with air brakes. It is for anyone pursuing a Class A or Class B CDL, or upgrading an existing CDL, who expects to drive trucks, tractor-trailers, buses, or other vehicles with air-actuated service, parking, and emergency brakes. The test is taken in addition to the general CDL knowledge test and covers system components, the air supply and reservoirs, brake pedal application and release, pre-trip inspection and leak testing, low-pressure warning devices and emergency braking, parking brake use, and safe driving habits specific to air-braked vehicles. Preparation means studying the air brake chapter of the current Maryland CDL manual until you can explain each component's function and walk through the inspection and leak-down tests from memory, then practicing with the actual controls or a training vehicle if you have access to one. The MD CDL Air Brakes case studies are 5 cases and about 2,672 words.