Air Brakes Eng 3

You have a fully-charged air system (125 psi). After turning off the engine and releasing the service brake, what are the maximum leakage rates per minute for both single and combination vehicles?

2 psi for single, 3 psi for combination
3 psi for both
4 psi for both
6 psi for both

What are the characteristics of the air pumps in the air storage tanks?

Safety valve.
Air compressor
Governor
Reservoir

What does it mean when the “wig wag” drops a mechanical arm into your view?

The air pressure in the system has dropped below 60 PSI.
You are applying too much pressure to the brakes.
One or more of the braking systems has failed.
The front-brake limiting valve has cut the pressure to the front brakes.

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

Perceptive
Reaction
Brake lag
Brake long

The braking power of the spring brakes depends on?

Adequate adjustment.
How far the modulation control lever moves (if present).
Traction.
All previous

Foundation brakes are used

Only in emergencies
When parking
At each wheel
On the driver's side wheels

Chocking the wheels, releasing the parking brake when there is enough pressure to do so, shutting the engine off, and then stepping on and off the brake pedal will test what?

The amount of pressure in the air brake system
If the spring brakes come on automatically
The low pressure warning signal
The air compressor governor cut-in and cut-out pressures

The cut-out level and cut-in level for the air compressor governor are roughly what pressure, in pounds per square inch (PSI)?

125 PSI and 100 PSI
150 PSI and 100 PSI
100 PSI and 80 PSI
150 PSI and 125 PSI

protects the tank and the rest of the air system from too much pressure?

Safety valve
Foot valve
Treadle valve
Scape valve

If the air pressure does not build up to normal at the right time, then?

You should be ready to use the parking brake to help you stop
Your air pressure can drop too much during driving, requiring an emergency stop
The alcohol container could be low
The fan will close than valve

During the inspection, if a slack adjuster moves a little more than an inch where the push rod adheres to it, then?

It has the perfect amount of slack.
Probably needs adjustment.
The brakes will stop the vehicle very suddenly.
Inspection will pass on the road.

When checking that the spring brakes are activated automatically, you should not?

Pull the parking brake control knob.
Shim the wheels.
Press and release the brake pedal
Turn off the engine.

Compressed air usually contains substances that are harmful to the brake system, wha are these substances?

Dust and compressor oil
Water and compressor oil
It does not contain harmful substances
Water and dust

During a hydraulic brake inspection, you should pump the brake pedal three times and then verify that the pedal holds for five seconds, if the brakes are working correctly the pedal should?

Not move
Slightly pressing
Down to the floor
Press hard

Should the low air pressure warning light come on before the air pressure in the tanks drops below the psi level?

30
40
50
60

Air brake systems use ___________.

Hot air.
Cold air.
Compressed air.
Uncompressed air.

You have a fully charged air system (125 psi). After turning off the engine and releasing the service brake, what are the maximum leak rates per minute for individual and combined vehicles?

2 psi for single, 3 psi for combination
3 psi for both
4 psi for both
4 psi for single, 5 psi for combination

The air compressor is an important part of the air brake system. What is the purpose of the air compressor?

To pump air to the hydraulic brakes
To pump air into the hydraulic brake system
To pump air into the sleeper storage tanks
To pump air to the air tank

When you apply the brakes, the brake shoes or linnings are against the?

Brake drum or disc
Slack adjuster
S-cam
All of the above

What can be caused by the unnecessary pressing and releasing of the brake pedal?

The brakes will stop working
The brake pedal will begin to shake
The emergency brakes will come on
There is no effect on the braking system

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