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Air Brake Test

QuestionAnswer
What is the BEST way to test if your vehicle’s spring brakes come on automatically? -On tractor-trailer vehicle, continue to step on and off the pedal until the parking brake valve pops out. -Continue to step on and off the brake pedal until the manufacturer’s low PSI specification is met for spring brakes to deploy -On single vehicles,
What is the BEST way to test if your vehicle’s spring brakes come on automatically? All of the above are correct
How do brakes work on a long, steep downgrade? They work as a supplement to the braking effect of your engine.
At what measurement is the safety valve USUALLY set to open? 150 PSI
The purpose of a supply pressure gauge is: To tell you how much air is in the tank
SLACK ADJUSTERS are: -Part of the air brake system that is used to adjust the brakes -Between the push rod and S-CAM on DRUM BRAKES -Between the power screw and push rod on DISC BRAKES (All of the above)
Which of the following should you do BEFORE leaving your vehicle UNATTENDED? -Remove the keys -Set the parking -Chock the wheels (All of the above)
Under which conditions are FRONT WHEEL brakes good? All weather conditions
How can you tell if your vehicle is equipped with an antilock braking system (ABS)? Check if the vehicle was manufactured after 1998
After the initial drop, the maximum acceptable leakage rates per minute are: 3 PSI for a single vehicle and 4 PSI for combination vehicles
Which of the following is NOT part of the air brake system? Radio signal system
How would you check your truck’s slack adjusters? Use gloves and pull hard on each slack adjusters you can reach.
Which of the following can cause brakes to fade or fail? -Excessive use of the service brakes -Brakes being out of adjustment -Not relying enough on engine brake (All of the above)
An Antilock Braking System (ABS): Activates when your wheels are about to lock up
Spring brakes are: -Made up of powerful springs that are held back by air pressure while driving -Not going to take full effect until your PSI drops to a certain range, typically 20-30 PSI -Brakes that come on automatically on a truck when PSI drops too low
Which of the following is NOT part of the drum brake? Safety Valve
When should you use the parking brake? Every time you leave your vehicle, with a few exceptions
A tractor protection Valve: -Provides air supply for the brake system -Will close automatically if the air supply drops to a certain level -Will close if you apply the parking brakes
Why must you pass a knowledge test on AIR BRAKES? Otherwise, you will have to get a CDL with restrictions
Which of the following is NOT part of the braking process when you’re driving a tractor-trailer combination vehicle with an antilock braking system (ABS)? You should drive faster so that you will be able to keep the trailer and tractor straight.
When should you drain your air tanks? At the end of each working day
Which of the following are TRUE about a dual air brake system? -It uses a single set of brake controls -Usually, one system operates the front axle, and the other one operates the rear axle -One system is called “primary” system and the other is called the “secondary” system (All of the above are true)
Which vehicle must have low air pressure warning signals? All vehicles with air brakes currently in operation must have low air pressure warning signals
What is the best way to test your vehicle’s low air pressure warning signal? With the engine off, step on and off the brake pedal to lower the air pressure below 60 PSI
If the air tanks are not drained: Your brakes may fail because of water freezing
Which of the following will be TRUE about your brake function if your antilock braking system (ABS) fails? You will still have normal brake function and will need to get the ABS repaired soon
Created by: zedoc43
 

 



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