Questions appearing on this CDL practice test:
Oil and water usually collect in compressed air tanks. If you do not have an automatic tank drain, when should you drain the air tanks?
What is the S-cam used for?
Which of the following makes the total stopping distance for air brakes longer than that for hydraulic brakes?
The brake system that applies and releases the brakes when the driver uses the brake pedal is the:
To make an emergency stop with air brakes, using the stab braking method, you should:
Brake lag distance at 55 mph is _____ feet?
If your vehicle has an alcohol evaporator, it is there to:
What can legally hold a parking or emergency brake in position for a truck, truck tractor or bus?
The braking power of the spring brakes:
Which of the following should you do before leaving your vehicle unattended?
Under which conditions are front wheel brakes good?
If the air tanks are not drained,
An antilock braking system (ABS)
Which of the following can cause brakes to fade or fail?
What is the best way to test if your vehicle's spring brakes come on automatically?
If your vehicle has a properly functioning dual air brake system and minimum-sized air tanks, the air pressure should build from 85 to 100 psi within ____ seconds.
The air compressor will stop pumping air into the air tanks at ____ psi.
Excessive heat caused by overuse of the service brakes can cause
Excessive use of the service brakes may result in overheating, which can lead to
A typical air brake system is fully charged at
During normal driving, spring brakes are usually held back by
During your final air brake check, if the air pressure does not build up fast enough,
To test the static air leakage rate, you should
Air brakes use _________ to make the brakes work.
When you press the brake pedal,
