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Modern air brake systems combine tree different systems. The systems are the service, parking and _______ brake systems.

Emergency

The driver must be able to see a warning before air pressure in the service tanks fall below ____ PSI

60

The brake pedal in an air brake system:

Controls the air pressure applied to the brakes

air braking takes more time than hydraulic braking because air:

It makes more time to flow through the lines than hydraulic fluid

If your vehicle has an alcohol evaporator, it is there to:

Reduce the risk of ice in the air brake valves in cold weather

If your truck has dual parking control valves, you can use pressure from a separate tank to:

Release the spring emergency parking brakes to move a short distance

to check the free play of manual slack adjusters on the S-cam brakes, you should park on

Level ground, chock the wheels, and turn off the parking brakes

Of the choices below, the first thing to do when a low air pressure warning comes on is:

Stop and safely park as soon as possible

The air compressor governor controls:

When air is pumped into the air tanks

The braking power of the spring brakes

Depends on whether the service brakes are in adjustment

All vehicles equipped with air brakes

A supply pressure gauge

If you must make an emergency stop, brake so you:

Can stay in a straight line and maintain steering control

If you do not have automatic tank drains, how often should you drain the oil and water from the bottom of compressed air storage tanks

At the end of each day of driving

The application pressure gauge shows how much air pressure you:

Are applying to the brakes

Your brakes are fading when:

You have to push harder on the brake pedal to control your speed on a downgrade

If your vehicle has an alcohol evaporator, everyday during cold weather you should

Check the alcohol level and fill the evaporator if needed

Why should you drain water from compressed air tanks

Water can freeze in cold weather and cause brake failure

You vehicle has a dual air brake system. If a low air pressure warning comes on for the secondary system, you should

Bring the to safe stop and continue only when fixed

During normal driving, spring brakes are usually held back by:

Air pressure

In air brake vehicles, the parking brakes should be used.

Any time the vehicle is parked

Emergency stab braking is when you;

Brake as hard as you can, release the brake when the wheels lock, then put on the brakes again when the wheels start rolling

A straight truck air brake system should not leak at a rate of more than _____ PSI per minute when the engine off and the brakes released

2

The air loss rate for a straight truck with the engine off and the brakes on should not be more than:

3 PSI in one minute

The supply gauge shows how much pressure

Is in the air tank

The brake system that applies and releases the brakes when the driver uses the brake pedal is the ___ brake system.

Service

When should you drain water from the compressed air tank?

Water can freeze in cold weather and cause brake failure

Total stopping distance for air brakes is longer than that for hydraulic brakes due to ___ distance

Brake lag

The most common type of foundation brake found on heavy vehicles is the:

S-cam drum brake

Which of the following makes total stopping distance longer for air brakes than for hydraulic brakes:

The one way check valve

If the compressor develops a leak, what keeps the air in the tanks?

The one-way check valve

WHEN AIR PRESSURE REACHES 100 PSI

AIR PRESSURE SHOULD CONTINUE TO BUILD UNTIL MY GOVERNOR CUTS OUT AROUND 120 AND 125 PSI

True or False: low Air Buzzer will not activate unless engine is running!

True

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