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Air Brakes

QuestionAnswer
If air pressure does not build fast enough within the correct amount of time, what could happen? A: The air pressure may drop too low during driving.
Q: The use of air brakes on a downgrade is only a supplement to what? A: The braking effect of the engine.
Q: Repeatedly pressing and releasing (fanning) the brake pedal may result in what? A: The loss of brake air pressure.
Q: All air brake equipped vehicles have what? A: An air supply pressure gauge.
Q: The air compressor should stop pumping prior to reaching what psi? A: 130 psi.
Q: What is emergency controlled braking? A: Apply the brakes as hard as you can without locking the wheels.
Q: The braking power of the spring brakes depends on what? A: The service brakes being in adjustment.
Q: If your truck or bus has dual parking control valves, you can use pressure from a separate tank to do what? A: Release the spring emergency/parking brakes to move a short distance.
Q: What is emergency stab braking? A: Brake hard, release the brakes when the wheels lock, and reapply the brakes when the wheels start rolling.
Q: If you do not have automatic tank drains, how often should you drain the oil and water from compressed air storage tanks? A: At the end of each day of driving.
Q: A supply pressure gauge tells you how much pressure is where? A: In the air tanks.
Q: Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do? A: Stop and safely park. Continue only after the system is fixed.
Q: To check the brake slack on S-cam brakes, where should you park? A: On level ground, chock the wheels, and release the parking brakes.
Q: In air brake vehicles, when should the parking brakes be used? A: Any time the vehicle is parked.
Q: If your vehicle has an alcohol evaporator, what is its purpose? A: Reduce the risk of ice in air brake valves in cold weather.
Q: With air brake vehicles, when should the parking brakes be used? A: Whenever you leave the vehicle unattended.
Q: If your vehicle has an alcohol evaporator, what should you do every day during cold weather? A: Check and fill the alcohol level.
To test the air service brakes, you should: A: Brake formally when slowly moving forward.
Q: The parking or emergency brakes of trucks and buses can be legally held on by what kind of pressure? A: Spring pressure.
Q: What does the air compressor governor control? A: When air is pumped into the air storage tank.
Q: A truck with air brakes going 55 mph would require a stopping distance of? A: More than 300 feet.
Q: If your truck has a dual air brake system and one of the systems is low on pressure, what happens? A: Either the front or rear brakes will not be fully operational.
Q: Why does air braking take more time than hydraulic braking? A: Air takes more time to flow through the lines than hydraulic fluid.
Q: What does the air supply pressure gauge show? A: How much pressure is in the air tanks.
Q: When you apply the brakes, what are the brake shoes/linings pressed against? A: The brake drum.
Q: Why drain water from compressed air tanks? A: Water can freeze in cold weather and cause brake failure.
Q: The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than? A: 3 psi in one minute.
Q: Why does air braking take more time than hydraulic braking? A: Air takes more time to flow through the lines than hydraulic fluid.
Q: The use of air brakes on a downgrade is only a supplement to what? A: The braking effect of the engine.
Q: Repeatedly pressing and releasing (fanning) the brake pedal may result in what? A: The loss of brake air pressure.
Q: What is the first thing you should do when a low air pressure warning comes on? A: Stop and safely park as soon as possible.
Q: The braking power of the spring brakes depends on what? A: The service brakes being in adjustment.
Q: Before driving a truck or bus with a dual air brake system, what should the pressure be in each system? A: At least 100 psi.
Q: What does the S-cam do? A: Forces the brake shoes against the inside of the brake drum.
Q: Why drain water from compressed air tanks? A: Water can freeze in cold weather and cause brake failure.
Q: Which brake system applies and releases the brakes when the driver uses the brake pedal? A: Service brake system.
Q: How should you test air service brakes? A: Brake firmly when slowly moving forward.
Q: The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like what? A: Spring pressure.
Q: The air brake lag distance at 55 mph on dry pavement adds about how many feet to your stopping distance? A: 32 feet.
Q: Excessive heat in the brakes can cause what? A: Brakes to fade or fail.
Q: When is it OK to leave your truck unattended without applying the parking brake or chocking the wheels? A: Never.
Q: A truck with air brakes going 55 mph would require a stopping distance of? A: More than 300 feet.
Q: What does the air supply pressure gauge show? A: How much pressure is in the air tanks.
Q: How should you check that the spring brakes come on when air pressure in the system drops below a certain level? A: Park on level ground, chock the wheels, release the parking brake when you have enough air pressure, shut the engine off, and repeatedly press and release the brake pedal.
Q: If your truck has a dual air brake system and one of the systems is low on pressure, what happens? A: Either the front or rear brakes will not be fully operational.
Q: The parking or emergency brakes of trucks and buses can be legally held on by what kind of pressure? A: Spring pressure.
Q: Which statement about anti-lock braking system (ABS) is true? A: ABS changes the way you brake in emergencies.
Q: When is it NOT a proper time to apply the parking brakes? A: When your brakes are very hot.
Q: Modern air brake systems combine three different systems. What are they? A: Service, parking, and emergency brakes.
Q: The air compressor should stop pumping prior to reaching what psi? A: 130 psi.
Q: The braking power of the spring brakes depends on what? A: The service brakes being in adjustment.
Q: If your vehicle has an alcohol evaporator, what is its purpose? A: Reduce the risk of ice in air brake valves in cold weather.
Q: What does the air compressor governor control? A: When air is pumped into the air storage tanks.
Q: All air brake equipped vehicles have what? A: An air supply pressure gauge.
Q: The use of air brakes on a downgrade is only a supplement to what? A: The braking effect of the engine.
Q: Repeatedly pressing and releasing (fanning) the brake pedal results in what? A: The loss of brake air pressure.
Q: Which brake system applies and releases the brakes when the driver uses the brake pedal? A: Service brake system.
Q: If your truck has a dual air brake system and one of the systems is low on pressure, what happens? A: Either the front or rear brakes will not be fully operational.
Q: How should you check that your service brakes are working properly? A: Wait for normal air pressure, release the parking brake, move the truck forward slowly, and apply the brake firmly using the brake pedal.
Q: For air brake systems in good condition, at what psi should the air compressor start pumping? A: 100 psi.
Q: Your truck has a properly functioning dual air brake system and minimum size air tank. How long should it take to build pressure from 85 to 100 psi? A: 45 seconds.
Q: The braking power of the spring brakes depends on what? A: The service brakes being in adjustment.
Q: Excessive heat in the brakes can cause what? A: Brakes to fade or fail.
Q: If you must make an emergency stop, how should you brake? A: Brake so you can steer and your vehicle stays in a straight line.
Q: A truck with air brakes going 55 mph would require a stopping distance of? A: More than 300 feet.
Q: When is it OK to leave your truck unattended without applying the parking brake or chocking the wheels? A: Never.
Q: Excessive use of the service brakes results in overheating, which can lead to what? A: Expansion of the brake drums.
Q: You are on a steep downgrade and have reached your "safe" speed of 40 mph. You apply the service brakes until your speed drops to what mph? A: 35 mph.
Q: If your anti-lock braking system (ABS) is not working, what should you do? A: Drive normally, but get the system serviced soon.
Q: A supply pressure gauge tells you how much pressure is where? A: In the air tanks.
Q: What is the most important thing to do when a low air pressure warning comes on? A: Stop and safely park as soon as possible.
The most common type of foundation brake found on a heavy vehicle is the: A: S-Cam drum.
Q: Your vehicle has a dual air brake system. If a low air pressure warning comes on for the secondary system, what should you do? A: Bring the vehicle to a safe stop and continue only when the system is fixed.
Q: Why drain water from compressed air tanks? A: Water can freeze in cold weather and cause brake failure.
Q: The parking or emergency brakes of trucks and buses can be legally held on by what kind of pressure? A: Spring pressure.
Created by: user-2034175
 

 



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