This section covers air brake systems. An air brake vehicle consists of 3 different systems; the service brake, parking brake and the emergency brake. The emergency brake system uses parts of the service and parking brake systems to stop the vehicle if the brake system fails.
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Question 1: How can you prevent water and oil from building up in the air storage tanks?
Correct: Drain your air tanks daily to prevent water and oil from building up.
Incorrect. Drain your air tanks daily to prevent water and oil from building up.
Incorrect. Drain your air tanks daily to prevent water and oil from building up.
Question 2: The air compressor...
Correct. The air compressor pumps air into the storage tanks or reservoirs.
Incorrect. The air compressor pumps air into the storage tanks or reservoirs.
Incorrect. The air compressor pumps air into the storage tanks or reservoirs.
Question 3: Which statement best defines the air governor?
Correct. The air governor controls when the air compressor will pump air into the air storage tanks.
Incorrect. The air governor controls when the air compressor will pump air into the air storage tanks.
Incorrect. The air governor controls when the air compressor will pump air into the air storage tanks.
Question 4: The most common type of air brake system is the___________.
Correct. The S-Cam Brake is the most common type of air brake system.
Incorrect. The S-Cam Brake is the most common type of air brake system.
Incorrect. The S-Cam Brake is the most common type of air brake system.
Question 5: The gauge that measures the amount of air in the storage tanks is called the application gauge.
Incorrect. The "supply" pressure gauge measures the amount of air in the storage tanks. The "application" pressure gauge shows how much pressure you are applying to the breaks.
Correct. The "supply" pressure gauge measures the amount of air in the storage tanks. The "application" pressure gauge shows how much pressure you are applying to the breaks.
Question 6: All air brake vehicles must have a low air pressure warning signal. What does it do?
Correct. A red light, buzzer or flag that warns the driver when air pressure falls below 60 psi.
Incorrect. A red light, buzzer or flag that warns the driver when air pressure falls below 60 psi.
Incorrect. A red light, buzzer or flag that warns the driver when air pressure falls below 60 psi.
Question 7: Front wheel brakes are good under all conditions.
Correct. Test have shown that front wheel skids from braking are not likely; even on ice.
Incorrect. Test have shown that front wheel skids from braking are not likely; even on ice.
Question 8: Which is the best definition of spring brakes?
Correct. Spring brakes are part of the air brake's emergency and parking brake systems. When you are parked, the brakes are held closed by mechanical force. So the vehicle will not roll away if the air leaks out. When driving the powerful springs are held back by air pressure. If the air pressure is removed, the springs put on the brakes in an emergency. When driving the powerful springs are held back by air pressure. If the air pressure is removed, the springs put on the brakes in an emergency. Powerful springs rotate and contract thus applying the brake shoes to the disc or drum.
Question 9: When will your ABS brakes activate?
Correct. ABS is a computerized system that keeps your brakes from locking up. They only activate when wheels are about to lock up. ABS does not decrease or increase your normal braking ability. ABS stands for Always Brake System. Your ABS brakes are always active giving you the greatest stopping power.
Incorrect. ABS is a computerized system that keeps your brakes from locking up. They only activate when wheels are about to lock up. ABS does not decrease or increase your normal braking ability.
Question 10: Which is the best definition of a dual air brake system?
Correct. A dual air brake system has two separate systems. One system operates the brakes on the front axle and one system operates the brakes on the rear axle. Both systems supply air to the trailer.
Incorrect. A dual air brake system has two separate systems. One system operates the brakes on the front axle and one system operates the brakes on the rear axle. Both systems supply air to the trailer.
Question 11: When driving with a dual air brake system you should:
Correct. Have a minimum of 100 psi, watch both gauges and pay attention to the low air warning light or buzzer.
Incorrect. Have a minimum of 100 psi, watch both gauges and pay attention to the low air warning light or buzzer.
Incorrect. Have a minimum of 100 psi, watch both gauges and pay attention to the low air warning light or buzzer.
Question 12: Which is the correct procedure for checking slack adjusters on s-cam brakes?
Correct. Park on level ground and chock the wheels, release the parking brakes, pull on each slack adjuster. Slack adjusters with more than 1 inch of free play need adjustment.
Incorrect. Park on level ground and chock the wheels, release the parking brakes, pull on each slack adjuster. Slack adjusters with more than 1 inch of free play need adjustment.
Question 13: How can you test that the low air pressure warning device works?
Correct. Turn on the key so you have electricity, pump the brake pedal to reduce air pressure. The low air warning light, buzzer or flag should come on before 60psi.
Incorrect. Turn on the key so you have electricity, pump the brake pedal to reduce air pressure. The low air warning light, buzzer or flag should come on before 60psi.
Question 14: When performing the "applied air loss test" how much air pressure loss is acceptable for a single vehicle?
Correct. During the applied leak test. Shut off the motor, release the parking brake, hold your foot on the brake pedal for 1 minute and watch your air pressure gauge. If you lose more than 3 psi on a single vehicle or 4 psi on a combintion vehicle the air loss rate is too much.
Incorrect. During the applied leak test. Shut off the motor, release the parking brake, hold your foot on the brake pedal for 1 minute and watch your air pressure gauge. If you lose more than 3 psi on a single vehicle or 4 psi on a combintion vehicle the air loss rate is too much.
Incorrect. During the applied leak test. Shut off the motor, release the parking brake, hold your foot on the brake pedal for 1 minute and watch your air pressure gauge. If you lose more than 3 psi on a single vehicle or 4 psi on a combintion vehicle the air loss rate is too much.
Question 15: What should happen when you pump the brakes down between 45-20 psi?
Incorrect. The emergency brakes will activate and the parking brake knob will pop out.
Correct. The emergency brakes will activate and the parking brake knob will pop out.
Incorrect. The emergency brakes will activate and the parking brake knob will pop out.
Question 16: Brake linings must not be_____________ (check all that apply).
All are correct. Brake linings must not be loose, soaked with oil or grease
Incorrect. Brake linings must not be loose, soaked with oil or grease and are not excessively thin.
Incorrect. Brake linings must not be loose, soaked with oil or grease and are not excessively thin.
Question 17: How can you test that the service brakes work?
Correct. Wait for normal air pressure, release the parking brake, move the vehicle forward 5 mph and apply the foot brake. Note any pulling to one side or delayed stopping action.
Wait for normal air pressure, release the parking brake, move the vehicle forward 5 mph and apply the foot brake. Note any pulling to one side or delayed stopping action.
Question 18: ABS brakes gives you added stopping power. Use less than normal braking pressure while stopping.
Incorrect. Brake normally with ABS brakes. Use only the braking force necessary to stop the vehicle.
Correct. Brake normally with ABS brakes. Use only the braking force necessary to stop the vehicle.
Question 19: The air brake lag effect adds 2 seconds to the total stopping distance formula.
Incorrect. The air brake lag effect adds 1/2 second to the total stopping distance formula.
Correct. The air brake lag effect adds 1/2 second to the total stopping distance formula.
Question 20: What is the best definition of brake fade?
Correct. When the brakes become too hot, they may start to fade. This means you have to apply them harder and harder to get the same stopping power.
Incorrect. When the brakes become too hot, they may start to fade. This means you have to apply them harder and harder to get the same stopping power.
Question 21: When driving in the mountains, what may happen if you have one or more brakes out of adjustment?
Correct. Brakes that are out of adjustment will stop doing their share of the work, causing the other brakes to overheat and fade.
Incorrect. Brakes that are out of adjustment will stop doing their share of the work, causing the other brakes to overheat and fade.
Question 22: A vehicle with ABS brakes on all axles with all of the brakes in proper adjustment may not need to use the braking effect of the engine.
Incorrect. Brakes that are out of adjustment will stop doing their share of the work, causing the other brakes to overheat and fade.
Correct. ABS brakes are only a supplement to the braking effect of the engine.
Question 23: What must you do as soon as the low air warning pressure system activates?
Incorrect. Stop and safely park your vehicle as soon as possible.
Correct. Stop and safely park your vehicle as soon as possible.
Question 24: If you are parked on a flat, level ground it is not necessary to set your parking brakes.
Incorrect. Never leave your vehicle unattended without applying the parking brakes or chocking the wheels.
Correct. Never leave your vehicle unattended without applying the parking brakes or chocking the wheels.
© Safety as a Service 2016