Questions appearing on this CDL practice test:
If your truck or bus has dual parking control valves it means that you can use pressure from a separate tank to:
The brake pads should be _____ for the brakes to be on?
You should know that your brakes are fading when:
The application pressure gauge shows the driver how much pressure:
If the air compressor should develop a leak, what keeps the air in the tanks?
Why drain water from the compressed air tanks?
During normal driving, spring brakes are usually held back by:
Brake drums must not have cracks longer than _____ the width of the friction area?
After the initial drop, the maximum acceptable leakage rates per minute are
How do brakes work on a long, steep downgrade?
How would you check your truck's slack adjusters?
The parking brake control
If the low air pressure warning signal is not working,
Your vehicle has a dual air brake system. One of the systems loses air pressure. What will happen?
Under ideal conditions, the average driver of a truck or bus equipped with air brakes and traveling at 55 mph would require what stopping distance?
Modern air brake systems are three different systems combined: the service brakes, parking brakes, and _______ brakes.
To check the free play of manual slack adjusters on S-cam brakes you should:
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?
If your vehicle has an alcohol evaporator, every day during cold weather you should:
With S-cam drum brakes, when the brake chamber fills with air, air pressure pushes the push rod out, moving the ________ and thus rotating the ________.
In which of the following situations should you NOT apply the parking brakes?
Which of the following can cause brakes to fail or fade?
If you need to stop quickly and your vehicle lacks antilock brakes, you can use
Tractor and straight truck spring brakes will come fully on when the air pressure drops to a range of
The modulating control valve allows you to control the