Free Air Brakes Practice Test 2 designed to help you pass the written exam with ease

By Tommy on Friday, October 30th, 2009 | 1 Comment

To better help you pass the Air Brakes section of the CDL exam I have added a few videos. The post that includes these videos can be found here. You may also want to listen to the pod cast that cover Air brakes, the pod cast links are here; CDL 101 Weekly – Episode #17, CDL 101 Weekly – Episode #18 and CDL 101 Weekly – Episode #19.

Air brakes Practice Test 2

Taking the CDL written exam can be stressful, feel free to practice on our free practice exam. This practice exam has been put together by a former CDL instructor and hits all the right points. You can even choose to e-mail yourself the results if you so desire. This practice test will help you prepare for the AIR BRAKES test when testing for your CDL.
Good luck.

A dual air brake system has two separate air brake systems, which use a single set of brake controls.

True

False

Before driving a vehicle with a dual air system, allow time for the air compressor to build up a minimum of __ psi pressure in both the primary and secondary systems.

100

120

None of the above

The warning light and buzzer should shut off when air pressure in both systems rises to a value set by the manufacturer. This value must be greater than __ psi.

100

None of the above

There are less things to inspect on a vehicle with air brakes than one without them.

True

False

When pulling a slack adjuster, If a slack adjuster moves more than about __ inch where the push rod attaches to it, it probably needs adjustment.

3/4

1 1/4

None of the above

The manual adjustment of automatic slack adjusters is dangerous because it gives the vehicle operator a false sense of security
about the effectiveness of the braking system.

True

False

The low air pressure warning signal must come on before the pressure drops to less than __ psi.

None of the above

When the engine is at operating rpms, the pressure should build from 85 to 100 psi within __ seconds in dual air systems.

None of the above

Maximum leakage rates; The loss rate should be less than __ psi in
one minute for single vehicles.

None of the above

Maximum leakage rates; less than __ psi in one minute for combination vehicles.

None of the above

When only the trailer has ABS, the trailer is more likely to swing out.

True

False

Controlled Braking. With this method, you apply the brakes as hard as you can without locking the
wheels.

True

False

Stab Braking. With this method, you apply the brakes as hard as you can without locking the
wheels.

True

False

At 55 mph for an average driver under good traction and brake conditions, the total stopping distance is over __ feet.

450

550

650

None of the above

Braking creates heat.

True

False

As the overheated drums expand, the brake shoes and linings have to move farther to contact the drums, and the force of this contact is increased.

True

False

Brake fade is also affected by adjustment.

True

False

The use of brakes on a long and/or
steep downgrade is only a supplement to the braking effect of the engine.

True

False

Controlled braking is possible only while enough air remains in the air tanks.

True

False

If you are away from your vehicle only a short time, you do not need to use the parking brake.