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Airbrake > Air Brake 1 > Flashcards

Air Brake 1 Flashcards

1
Q

The _____ shows how much pressure is in the air tanks.

A

Supply Pressure Gauge

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2
Q

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

A

3 PSI in 1 minute

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3
Q

It is not safe to drive a vehicle that has brake drums with cracks that are longer than _____ of the width of the friction area.

A

1/2 (half)

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4
Q

Repeatedly partially increasing and pressing the brake pedal may result in:

A

A loss in brake air pressure

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5
Q

Under normal conditions, in order to engage the parking brakes the driver should:

A

Apply brakes by pulling the parking brake control knob out.

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6
Q

All air brake equipped vehicles have:

A

A supply pressure gauge

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7
Q

A straight truck of or bus air brake system should not leak at the rate of more than ____ psi per minute with the engine off and brakes released.

A

2 PSI

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8
Q

The air brake lag distance at 55 mph on dry pavement adds about ___ feet

A

32 Feet

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9
Q

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

A

Air pressure

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10
Q

The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below ___ PSI

A

60 PSI

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11
Q

With air brake vehicles, the parking brakes should be used:

A

Any time when vehicle is parked

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12
Q

Your truck has a dual air system and one of the systems loses its pressure. What will happen?

A

Either the front or back brake will not be fully operational.

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13
Q

Some air systems have an alcohol evaporator. What may happen if you don’t keep the proper level of alcohol?

A

Ice may form in the air brake valves and cause brake failure.

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14
Q

Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?

A

Stop right away and safely park. Continue only after the system is fixed.

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15
Q

If you are driving down a steep downgrade and have reached your safe speed of 40 mph, you would apply the service brake until your speed dropped to ___ mph.

A

35 mph

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16
Q

If the spring break are on, when should you push the brake pedal?

A

Never

17
Q

In ideal conditions a truck or bus with air brakes going at 55 mph would require the stopping distance of how many feet?

A

More than 300 feet

18
Q

The most important thing to do when at low air pressure warning comes on is

A

Stop and safely park as soon as possible

19
Q

The supply pressure gauge shows how much pressure

A

Is in the air tanks

20
Q

The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below ___ psi

A

20 PSI

21
Q

The safety valve is automatically set when the pressure is:

A

150 PSI

22
Q

If air pressure is not built up within the correct amount of time, then:

A

Air pressure may drop to a low point while driving, requiring an emergency stop

23
Q

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

A

S-cam drum

24
Q

The braking power of the spring brakes

A

Depends on the brakes being in adjustment

25
Q

If you are driving f=down a steep downgrade and have reached your safe speed of 40 mph, you would apply the service brake until your speed dropped to ___ mph

A

35 mph

26
Q

If the spring breaks are on, when should you push the brake pedal?

A

Never

27
Q

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

A

Release the spring emergency/parking brakes to move a short distance.

28
Q

When brakes are applied, the brake shoes will press against the

A

Brake drum or disc.

29
Q

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

A

Brake lag

30
Q

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

A

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

Airbrake (3 decks)

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