1 . Spring brakes come on:

When too much air pressure is lost.
When a control on the dashboard is activated.
When the tires have minimal tread depth.
When the brakes are noisy.

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

None of the brakes will work at all.
Either the front or rear brakes will not be fully operable.
There is usually no noticeable effect.

3 . What is brake lag?

The time required for the brakes to work after the brake pedal is pushed
The distance between the brake pedal’s resting position and the floor
The amount of air pressure used to stop a vehicle
How faded the brakes are

4 . Some air brake systems use alcohol:

To reduce the risk of ice forming in air brake valves.
To make the compressor run more efficiently.
To lubricate parts of the braking system.
To reduce the risk of rust forming on air brake valves.

5 . What do anti-lock brakes do?

Help a driver avoid wheel lockup
Lock up the front wheels
Prevent a vehicle from accelerating while traveling uphill
Prevent a vehicle from accelerating while traveling downhill

6 . If using air tanks with manually operated drains, how often should you drain the tanks?

Every day
Once a week
Once a month
Once every six months

7 . A slack adjuster should move no more than ____ from where it is attached to the push rod.

Two inches
Five inches
One inch

8 . Most heavy-duty vehicles use:

Single air brake systems.
Dual air brake systems.
Triple air brake systems.
Quadruple air brake systems.

9 . Brake fade is a result of:

Brakes being exposed to sunlight.
Brakes being exposed to moisture.
Excessive use of the brakes.

10 . All air tanks must include:

A drain valve.
A lock.
A trap door.
A warning sticker.

11 . How is water and compressor oil removed from the bottom of an air storage tank?

The water and oil are siphoned out of the tank.
A drain valve is opened to remove the water and oil from the tank.
The water and oil are removed automatically as the brakes are used.
A sponge is used to soak up the water and oil.

12 . Failing to drain air tanks could result in:

Water accumulations freezing and causing brake failure.
Squishy brakes.
Too much air collecting in the tanks.

13 . The most common type of foundation brake used is the:

S-cam drum brake.
C-cam drum brake.
G-cam disc brake.
P-cam disc brake.
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14 . If the low pressure warning light comes on while you are driving:

Braking will only be possible if there is still enough air in the tanks.
You can apply the brakes 14 times before the air in the system runs out.
You should continue to drive normally and check the brake system when it is convenient.
You should stay at least 100 feet away from other vehicles.

15 . What should happen if the air pressure in the air brake system tanks falls below 60 psi?

A warning light should come on.
Lights should flash on the outside of the vehicle.
A message should appear on the control panel.
The vehicle should stop.

16 . Lights that indicate that anti-lock brakes are not working are:

Gray.
Blue.
Yellow.

17 . Truck tractors with air brakes that were built on or after March 1, 1997 are equipped with:

An extra set of brakes.
Voice-activated brakes.
Cruise control.
Anti-Lock Braking Systems (ABS).

18 . To use the stab braking method, you should:

Apply the brakes completely until the wheels lock up, release the brakes until the wheels start rolling, then repeat the process.
Apply the brakes about halfway, but allow the wheels to keep rolling.
Apply the brakes completely until the wheels lock up and the vehicle stops.
Apply the emergency brake until the vehicle starts to slow.

19 . What happens if the air pressure in a system's air tanks falls below 60 psi?

A warning light will come on.
The vehicle will not shift out of gear.
The front lights will flash.
The vehicle should stop.

20 . Which part of the truck is the air compressor connected to?

The transmission
The engine
The radiator
The door latch

21 . Front wheel braking works:

Only on packed snow.
Under all conditions.
Only if the road is dry.
Under most conditions.

22 . During a static leakage test, what is the maximum leakage rate that is safe for a double combination vehicle?

3 psi in one minute.
6 psi in one minute.
8 psi in one minute.

23 . At what psi is the safety valve set to open?

100 psi
150 psi
200 psi
500 psi

24 . Brakes can get out of adjustment quickly, especially:

If they are hot.
In the winter time.
If they are used frequently.

25 . When traveling down a steep downgrade, the best way to use your brakes is to:

Ride the brakes all the way down the hill.
Apply the brakes for a few seconds, then release the brakes for a few seconds. Continue to repeat these steps as you travel down the hill.
Apply the brakes only near the bottom of the downgrade.
Apply consistent pressure to the brake pedal all the way down the hill.