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Ohio CDL Permit Test - Air Brakes

(From the 2021 Ohio CDL driver handbook)
Number of questions: 25
Passing score: 20
Directions: This endorsement is required for driving a vehicle with air brakes. To receive this endorsement, applicants must pass a written test. The test consists of 25 multiple choice questions. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the Ohio Commercial Driver’s License Manual. Questions come from chapter covering: Air Brakes. The Air Brakes endorsement may be used with the Class A, B or C CDL.
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5 or fewer errors
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1.

What kind of force do emergency brakes use?

Air pressure
Mechanical
Heavy
2.

The parking brake in a newer vehicle is applied by:

Moving a lever to the right.
Pushing a yellow, diamond-shaped knob.
Pulling a yellow, diamond-shaped knob.
3.

During an applied leakage test, the maximum leakage rate for a triple combination vehicle is ____ in a minute.

2 psi
4 psi
6 psi
4.

When an S-cam turns inside a brake drum, the S-cam:

Presses the brake shoes against the inside of the brake drum.
Presses the brake shoes against the brake linings.
Presses the brake linings against the wheel axles.
5.

In a dual air brake system, air pressure should build from 85 to 100 psi within ____ seconds.

25
10
45
6.

Truck tractors with air brakes built on or after March 1, 1997 must have:

An Anti-Lock Braking System (ABS).
Bluetooth.
A GPS.
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