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

1. To test the service brake:

push the brake pedal firmly while going about 5 mph.
gently try to pull forward with the trailer parking brake on, then release the brake.
shift your transmission to a low gear, pump the brake pedal three times, then hold it down for five seconds.
push the brake pedal firmly while slowly moving backward.

2. The best way to recognize that your trailer has started to skid is:

by seeing it in your mirrors.
by opening the window and feeling the front of the mirror.
by recognizing tire failure.
by feeling the brakes come on.

3. Truck tractors with air brakes built after March 1, 1997, are required to be equipped with:

4. Empty trucks:

have less traction.
require greater stopping distances.
are higher than loaded trucks.
All of the above.

5. Supply pressure gauges tell you:

how much air pressure you are applying to the brakes.
how much pressure is in the air tanks.
when the air pressure in the tanks falls below 60 psi.
when the pressure in the system drops below 60 psi.

6. The supply pressure gauges tell you how much air pressure:

is in the air tanks.
you are applying to the brakes.
is going to the brake chambers.
is in the air brakes.

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

8. An Anti-lock Braking System (ABS):

always shortens your stopping distance.
lets you drive faster.
keeps your wheels from locking up when you brake hard.
increases your normal braking capability.

9. If you are being tailgated, you should:

avoid tricks like turning on your taillights or flashing your brake lights.
increase your following distance.
avoid quick changes.
All of the above.

10. Which of the following is NOT part of the air brake system?

AIR BRAKES CDL PRACTICE TEST - COLORADO