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

1. When going down a steep downgrade, you should:

use the parking brake.
avoid braking and rely on engine braking.
use a low gear, and a proper braking technique.

2. What factors can cause brakes to fade?

Slippery surfaces and shaded areas.
Dirt roads and in unpaved yards.
Excessive heat and brakes out of adjustment.

3. Which of the following is NOT a reason for hydraulic brake failure?

4. ABS brakes help you:

avoid wheel lock up.
downshift before starting down a hill.
lock up the wheels in an emergency stop.

5. On front tires, tread should be at least:

6. In a dual air brake system, if one air system is very low on pressure:

either the front or rear brakes will not be operating fully.
you should pump the brakes to restore pressure.
you should drive and brake as you always have.

7. Dual tires:

should always come in contact with each other.
should not come in contact with each other.
should come in contact with each other whenever possible.

8. Some air brake systems have an alcohol evaporator to:

reduce the danger of slipping.
reduce the stopping power of the vehicle.
prevent ice from forming in the brake system.

9. Passive railroad crossings:

do not have traffic control devices.
have at least one traffic control device.
should never be crossed using a CMV.

10. When driving on long and/or steep downgrades, to select an appropriate safe speed you should consider:

the road conditions.
the total weight of the vehicle and cargo.
All of the above.

AIR BRAKES CDL PRACTICE TEST - OKLAHOMA