Engineering Mechanics > EXAM REVIEW > Texas CDL Air Brake Exam Review Graded A+ (All)

Texas CDL Air Brake Exam Review Graded A+

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What are the components of a Air Brake System? - ANSWER Service Brake, Parking Brake, Emergency Brake What is the function of Air Compressor? - ANSWER Pumps air into the air storage tanks What does Air Compressor Governer do? - ANSWER Controls when the air compressor will pump into air the storage tank What is Air Storage Tank for? - ANSWER Tank to hold compressed air Why is a Air Tank Drain necessary? - ANSWER Component used to drain the water or oil from the air storage tanks What is the use of Alcohol Evaporator? - ANSWER To reduce icing in air brake valves and other parts What is the fuction of Safety Relief Valve (Safety Valve) - ANSWER To protect the tank and the rest of the system from too much pressure What is a Break pedal? - ANSWER Foot pedal to apply air pressure to service brakes What does a Supply Pressure Gauge do? - ANSWER Shows amount of pressure in the air tanks What is the fuction of an Application Pressure Gauge? - ANSWER Shows the amount of pressure applied to the brakes Why does Stop light switch turn on? - ANSWER Turns on the brake lights brake pedal used thus warns drivers behind What is a Spring Break? - ANSWER Emergency break that comes on when service breaks fail When is Parking Brakes applied? - ANSWER when vehicle is parked What is the role of ABS (Antilock Braking System)? - ANSWER Vehicles built after March 1 1994, ABS prevents wheels lock-up during hard brake applications S-cum Brakes - ANSWER Part that forces the brake shoes away from one another and presses them against the inside of the brake drum Service Breaks - ANSWER Trailer breaks applied by brake pedal Dual Air Brake - ANSWER Break system with two separate air brake systems which uses single set of brake controls. Low Air Pressure Testing - ANSWER Engine off, electric power on, step on and off on break pedal to reduce the air Tank pressure. If pressure drops to less than 60 psi, it ain't working How would you test Spring Breaks? - ANSWER Step on and off brake pedal (engine off, electrical on) parking brakes pop out when the air pressure falls between 20 - 45 psi What level should Air Pressure Build-up with Dual Air Systems be? - ANSWER 85 to 100 psi in 45 seconds, when engine is at operating rpms What is the ideal Air Pressure Build-up with Single Air Systems (prior to 1975)? - ANSWER 50 to 90 psi within 3 minutes, when engine at an idle speed 600-900 rpms How can you conduct Air Leakage Testing with single (straight) vehicles? - ANSWER Air System fully charged, engine off, parking brakes released loss should be less than 2 psi How can you conduct Air Leakage Testing with combination vehicles? - ANSWER Air System fully charged, engine off, parking brakes released loss should be less than 3 psi How can you determine Air Compressor Governer Cut-off Pressure is good? - ANSWER Engine run in fast idle, Governer should stop pumping air into the tanks at 125 psi How can you determine Air Compressor Governer Cut-in Pressure is ideal? - ANSWER Engine idling at normal, Governer should start pumping air into the tanks at 100 psi

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