Michigan CDL Air Brakes case studies
Michigan CDL Air Brakes · Put your knowledge to work in context.
The Michigan CDL Air Brakes knowledge test is the endorsement exam a Michigan commercial driver takes to have air-brake-equipped vehicles added to a Commercial Driver's License. It is written for drivers preparing to operate air-braked trucks, tractors, and buses, and for drivers upgrading an existing CDL. The test is delivered as multiple-choice questions and is organized around four study areas: air brake system components and operation; inspecting and maintaining air brake systems; system failures and emergencies; and safety practices and test procedures. Preparation should center on understanding how compressed air builds, stores, and releases pressure, how the various valves interact, how to perform a proper pre-trip air brake inspection, and what to do when pressure is lost. The Michigan CDL Air Brakes case studies are 5 cases and about 2,375 words.
1Pressure Climbs Past Cut-Out on a 2019 Tractor
You are doing a pre-trip inspection on a 2019 three-axle tractor with a dual-circuit air system. The engine is at fast idle and the gauges show 80 psi.
496 words, about 2 min2Released Test Passes but Applied Test Fails
You are the driver of a tractor-trailer with three axles on the tractor and two on the trailer. After building full pressure, you park on level ground, chock the wheels, shut off the engine, and release the parking brakes.
466 words, about 2 min3Low Air Pressure on a 6% Grade
You are driving an 80,000 lb five-axle combination down a 6% grade that is 2 miles long. At the top, the air gauge reads 125 psi and you are in 8th gear at 45 mph.
471 words, about 2 min4A 20-Minute Pre-Trip With Invalid Air Tests
Before leaving the terminal, a driver has 20 minutes to do the air brake pre-trip checks on a single-unit truck. The tank is at 100 psi when he starts.
491 words, about 2 min5Brake Fade With Normal Air Pressure
You are driving a 78,000 lb five-axle combination down a 7% grade that is 3 miles long. It is 90°F, dry, and you are in 7th gear at 35 mph.
451 words, about 2 min