Air Brakes CDL Test (2024) - FREE LA CDL Practice Test

1. One way to prevent hydroplaning is to:

use the controlled braking method.
make sure you have enough tread on your tires.
have less than 4/32 inch tread depth in every major groove on front tires.
take curves at higher speeds.

2. You should always try to back toward the driver's side because:

backing toward the left side is more dangerous.
you can watch the rear of your vehicle out the side window.
you can more easily correct any steering errors.
None of the above.

3. Spring brakes:

apply when air pressure leaves the brake chamber and release when air pressure builds up in the chamber.
are not designed to work in an emergency when your service brakes fail.
are air applied like service brakes.
All of the above.

4. If your vehicle is equipped with a front brake limiting valve, to ensure normal stopping power make sure the control is:

5. When backing, you should:

use the mirrors on both sides.
back and turn toward the right side whenever possible.
only use mirror on the driver's side.
back quickly.

6. The service brake applies and releases:

the brake in an emergency situation.
the brake when you use the brake pedal during normal driving.
the parking brake when you use the parking brake control.
None of the above.

7. Axle weight is:

the maximum safe weight your tires can carry at a specified pressure.
the value specified by the manufacturer as the loaded weight of one axle.
the weight transmitted to the ground by one axle or one set of axles.
the weight of all the axles added together.

8. In vehicles with air brakes, the brake pedal:

tells you how much pressure is in the air tanks.
pumps air into the air storage tanks.
controls the air pressure applied to the brakes.
let the air out of the spring brakes.

9. To check that spring brakes come on automatically, the first thing to do is to:

turn off the engine, release the parking brake and time the air pressure drop.
continue to step on and off the brake pedal until the air pressure falls to the manufacturer’s specification.
release the parking brake, move the vehicle forward slowly, and apply the brakes firmly.
All of the above.

10. An alcohol evaporator:

protects the air brake system from too much pressure.
used to reduce the chance of the front wheels skidding.
is used to reduce the risk of ice in air brake valves and other parts during cold weather.
to hold compressed air.

AIR BRAKES PRACTICE TEST - LOUISIANA