Texas CDL Air Brakes 2022/2023 Exam with all Answers100% Correct

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Air brake systems combine what three different systems? - ANSWER Service brakes, parking brakes and emergency brakes. When should you drain the air tanks? - ANSWER After every working day. Why d... rain water from the compressed air tanks? - ANSWER Water can freeze in cold weather and cause brake failure. Air brake equipped vehicles must have: - ANSWER A supply pressure gauge and warning signal when psi drops below 60. What can legally hold a parking or emergency brake in position for a truck, truck tractor or bus? - ANSWER Spring pressure. What makes the total stopping distance for air brakes longer than that for hydraulic brakes? - ANSWER Brake lag distance. The first thing you should do when the low air pressure warning comes on? - ANSWER Stop and safely park ASAP. The braking power of the spring brakes: - ANSWER Depends on the adjustment of the service brakes. The air compressor governor controls what? - ANSWER When air is pumped into the air tanks. The application pressure gauge shows the driver how much pressure: - ANSWER Is being applied to the brakes. When you apply pressure to the brake pedal, you are... - ANSWER Pushing against a spring and against air pressure to the brakes. The air compressor is connected to the engine through... - ANSWER Gears or a V-belt Which type of brake is the most common in commercial vehicles? - ANSWER S-cam brake An application pressure gauge... - ANSWER Shows how much air pressure you are applying to the brakes. All vehicles with air brakes are required to have a low pressure warning signal. This could be... - ANSWER A red light, wig wag mechanical arm or a buzzer. To test service brakes you should... - ANSWER Release the parking brake, move forward slowly and depress brakes. Stab braking occurs when you... - ANSWER 1. Press on a brake pedal as hard as you can. 2. Release the brakes when the wheels lock up. 3. Apply the brakes when the wheels start rolling. Air brakes take longer to stop than hydraulic brakes because... - ANSWER It takes longer for the air to flow through the lines. The proper way to go down long grades is to... - ANSWER Apply brakes just hard enough to reduce speed to 5 mph below safe speed then release until back to safe speed and repeat process. When should you avoid using the parking brake? - ANSWER When the brakes are hot. If your vehicle has an alcohol evaporator, everyday during cold weather you should: - ANSWER Check and fill the alcohol level. During normal driving, spring brakes are usually he'd back by what? - ANSWER Air pressure In air brake vehicles, the parking brakes should be used when? - ANSWER Whenever the vehicle is parked. The brake pedal in an air brake system does what? - ANSWER Controls the air pressure applied to put on the brakes. If your bus has dual parking control valves it means that you can use pressure from a separate tank to: - ANSWER Release the spring brakes to move a short distance. A straight truck or bus air brake system should not leak at a rate of more than ____ PSI per minute with the engine off and the brakes released. - ANSWER 2 An alcohol evaporator does what? - ANSWER Reduces the risk of ice in the air brake valves in cold weather. If you must make an emergency stop, you should brake so that you: - ANSWER Stay in a straight line and can steer. Air loss should not be more than ___ with the engine off and brakes released. - ANSWER 2 psi per minute Stab braking - ANSWER Brake as hard and you can, get off the the breaks when wheels are locked, get back on the brakes when wheels start rolling again. How do you know when your brakes are fading? - ANSWER You have to push harder on the brake pedal to control your speed on a downgrade. To check the free play of manual slack adjusters on s-can brakes you should: - ANSWER Park on a level ground, chock wheels, and release parking brake. If the air compressor should develop a leak, what keeps the air in the tanks? - ANSWER The one way check valve. When driving down a long steep hill you should: - ANSWER Release the brake when you are 5 mph below you safe speed. The brake system that applies and releases the brakes when a driver uses the brake pedal is the: - ANSWER Service brake system. The most common type of foundation brakes found on heavy vehicles is the: - ANSWER S-can drum Vehicles with air brakes must have: - ANSWER An air pressure gauge to show the pressure available for braking. Air brakes should be drained... - ANSWER 1. At the end of each working day. 2. To keep sludge from clogging system valves. 3. Manually when automatic devices fail. Fanning air brakes... - ANSWER Decreases the air pressure. If you air compressor stops working... - ANSWER You'll still have pressure left in the tanks. The governor allows the air to star pumping aging when it reaches the cut in level or around... - ANSWER 100 psi You should not use the parking brakes... - ANSWER When the brakes are hot. The brake drums or discs... - ANSWER Must not have cracks longer than half the width of the friction area. Slack adjusters... - ANSWER Can be adjusted manually or automatically. To determine if slack adjusters need adjustment... - ANSWER Release big the service and parking brakes. An air tank is equipped with a dra [Show More]

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