Air Brakes #2

Brake drums...

Are bolted to the wheels

Are located at each end of the vehicle's axles

Hold the brake shoes and linings

All answers are correct

When the low pressure warning is activated, you should...

Monitor your air pressure gauge and maintain highway speeds

Bring the vehicle to a safe stop while you still control the brakes

Pump the brake pedal hard to stop

Wait for the air brakes to come on automatically

When the safety valve releases air it means that...

The pressure has exceeded 150 psi

Too much air is in the air tank

Something is wrong, and you should have it checked by a mechanic

All answers are correct

In a single vehicle with a fully charged air system, air pressure loss (after the initial drop and brake applied) should be less than...

2 psi per minute

3 psi per minute

4 psi per minute

None of the answers are correct.

The service brake system...

Applies and releases the brakes by using the brake pedal under normal driving

Is only on vehicles with hydraulic brakes

Are the valves that keeps the air tank pressure serviced

Is an official vehicle inspection

Your vehicle's single brake system does not need adjustment if...

The governor stops between 75 to 90 psi

Pressure builds from 85 to 100 psi within 45 seconds

The compressor cuts out between 70 to 90 psi

Pressure builds from 50 to 75 psi within three minutes

Some air brake systems have an alcohol evaporator which helps...

Remove fuel from the air lines

Remove oil from the air lines

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

Reduce the risk of water in the air brake valves in warm weather

Air tanks should be drained...

Every 2-3 days

Every 4 hours

Once per week

Once per day

The safety valve in the air compressor tank is set to open at...

200 psi

150 psi

100 psi

175 psi

Compressed air is stored...

In the engine compartment

In the storage tank

In the fuel tank

In the hoses

The Air Compressor Governor controls...

When the brakes should be applied

When the air compressor pumps air into the storage tanks

When the warning light is activated

When the air is released from the tank

A dual air brake system...

Has one set of air tanks and hoses

Has two air brake systems and one set of controls

Must have two warning alarms

Takes less time to build air pressure

An emergency brake...

Is required on commercial vehicles

Must be held on by mechanical force

Could be activated by the loss of air pressure

All of the above

To check the slack adjusters on S Cam brakes, you should...

Drain the air from the system and pull on the slack adjusters

Make sure the slack adjusters move more than one inch each way

Leave the parking brakes on and pull on the slack adjuster

Wear gloves, release parking brakes and pull hard on each slack adjuster

To test the low pressure warning signal, you should do all BUT the following...

Shut the engine off

Ask a friend to listen for the signal

Turn the electrical power on

Step on and off the brake pedal to reduce air pressure

With dual air systems, the air pressure should build...

From 70 to 100 psi in 60 seconds

From 85 to 100 psi in 45 seconds

From 85 to 150 psi in 45 seconds

From 70 to 150 psi in 60 seconds

A fully charged air system typically has ____ psi.

125

100

175

150

To test the air leakage rate you should...

Leave the engine running and release the service brake

Turn off the engine and release the service brake

Charge the air system and leave the engine running

Depress the brake pedal and monitor the air pressure gauge

When testing air leakage rates for combination vehicles (before applying the brake pedal), air brake systems should not lose air faster than...

3 psi per 30 seconds

4 psi per minute

3 psi per minute

2 psi per minute

To check the air compressor governor "cut in" and "cut out" pressures...

Run the engine at a fast idle

Step on and off the brake to reduce tank pressure

Monitor the air pressure gauge

All the above

Air tanks should be drained...

At the end of each day or shift

To keep sludge from clogging brake system valves

Manually when automatic devices fail

All the above

Fanning air brakes...

Increases the braking power

Increases the air pressure

Cools them off

Decreases the air pressure

If your air compressor stops working...

You will lose your brakes immediately

Your brakes won't be affected

You'll still have air pressure left in the air tanks

The brakes will immediately lock up

The governor allows the air to start pumping again when it reaches the cut in level, or around...

125 psi

100 psi

200 psi

150 psi

Air Brakes #2

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