If the air pressure warning light or buzzer comes on while you are driving, you should immediately stop and safely park the vehicle. This warning signal indicates that there is a problem in the air brake system that needs to be fixed.

Safely exit the roadway and stop.

Activate your hazard lights and continue driving.

Call the local law enforcement agency.

Safely exit the roadway and stop.

Using the brakes excessively will cause them to overheat, making them less effective. This is referred to as "fading."

Brakes are not used often enough.

If you are unsure if a trailer is equipped with an Anti-Lock Braking System (ABS), look under the vehicle for the electronic control unit and wheel speed sensor wires coming from the back of the brakes.

Look under the trailer for wheel speed sensors coming from the back of the brakes.

Look under the hood for the ABS sticker.

Remove a tire and look for the ABS sensor on the axle.

Truck tractors with air brakes built on or after March 1, 1997 must be equipped with Anti-Lock Braking Systems (ABS).

An Anti-Lock Braking System (ABS).

Air Brakes Endorsement Test | Delaware 2026 #2

Train for FREE online with our Delaware CDL air brake test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a DE Class A/Class B driver license in 2026, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that the requirements for CDL may vary from state to state.

Number of Question 25

Passing Score 20

Number of Tests 20

Air Brakes Endorsement Test | Delaware 2026 #2

1 . If the air pressure warning light comes on, you should:

2 . Brake fading is caused when:

3 . To confirm that a trailer has ABS, you can:

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

5 . Before a vehicle with dual air brakes is driven, pressure of at least ____ should be built up in both braking systems.

6 . How many air storage tanks are used in an air brake system?

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