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Utah CDL Permit Test - Air Brakes

(From the 2021 Utah 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. Each question has two, three or four answer choices. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the Utah Commercial Driver License Handbook. Questions come from the chapter covering: Air Brakes. The Air Brakes endorsement may be used with the Class A, B or C CDL.
You have made error so far
Passing grade —
5 or fewer errors

If the safety relief valve in an air brake system is releasing air:

You should not be concerned as this is a normal process.
There is something wrong with the brakes.
The valve is operational.

What is removed when an air tank is drained?

Water and oil

What must be on an air tank in an air-braked vehicle?

A check valve
A lock
A trap door
An oxidizer

Emergency brakes:

Are not required on trucks.
Are only required on trailers.
Are required on tractors.
Are optional.

When the spring brakes are on, you should never:

Turn on the lights.
Turn off the vehicle.
Push down the brake pedal.

What happens if brakes become too hot?

They will become too smooth.
They will harden.
They may stop working.
The air compressor will kick in to cool the brakes
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