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CDL PERMIT > Air Brakes > Flashcards

Air Brakes Flashcards

1
Q

3 different braking systems:

A

Parking
Service
Emergency

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2
Q

The governor controls ____ air is pumped into storage tanks

A

WHEN

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3
Q

Storage tanks hold enough air to operate brakes several times before compressor quits working . TRUE or FALSE

A

True

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4
Q

If a leak should occur in the COMPRESSOR there is a ONE-WAY check valve that prevents leaking from the storage tanks
TRUE or FALSE

A

True

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5
Q

Debris like oil & water are trapped in a Automatic Water Ejector in the 1st tank then pumped into a ____ _____.

A

Wet tank

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6
Q

Water in the air system can freeze and cause this to happen____ ____.

A

Brake failure

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7
Q

Alcohol evaporator reduces the risk of ____ building In the air brake system.

A

Ice

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8
Q

Safety valve is set to open at this psi.

A

120-125

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9
Q

Brake pedal controls air pressure to the _____brake

A

Service

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10
Q

Air supply pressure gauge shows how much is available in the_____?____.

A

Air tank

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11
Q

When using parking or emergency brakes this type of pressure is used.

A

Spring pressure

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12
Q

Air brake equipped vehicles must have this braking system just in case air system fails.

A

Hydraulic braking

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13
Q

Application pressure gauge shows driver how much air is being …

A

Applied the the brakes.

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14
Q

Warning device shows when air pressure is low in the services air brake when the psi falls below_____

A

60

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15
Q

What can legally hold a parking or emergency brake in position.

A

Spring brakes

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16
Q

What turns on the electrical stop switch in air brake system

A

Air pressure

17
Q

If truck has dual parking control valve. You can use pressure from separate tank to release ________

A

Release emergency brakes to move a short distance

18
Q

With dual air brake system. If a low air warning prejudge comes on for the SECONDARY SYSTEM you should

A

Stop safely park

Continue ONLY when system is repaired

19
Q

Stop and safely park as soon as the low air pressure warning comes on.
True or False

A

True

20
Q

Never disconnect steering axle breaks TRUE or FALSE

A

True

21
Q

Stab braking is a technique used during emergency braking. You need to :

A
  1. BRAKE HARD UNTIL WHEELS LOCK

2. LET OFF THE BRAKES WHILE WHEELS ARE LOCKED.

22
Q

Emergency brake is held on by SPRING AIR PRESSURE

True or False

A

True

23
Q

How to check the free- play on manual slack adjuster

A
  1. Park on level ground, chock wheels
  2. Release parking brakes
  3. Pull slack adjuster

•CAN NOT HAVE ANYMORE 1/2”-3/4 “ free play

24
Q

Air leakage release rate for COMBO engine OFF, brakes released. Air syst. should not loose more than ____ psi per minute :

A

3

25
Q

Straight truck ENGINE OFF-BRAKES RELEASED air brake system should not leak more than ____ psi per minute

A

2

26
Q

Air of s straight vehicle ENGINE OFF. BRAKES ON!!! Should not leak more than ___ psi per minute.

A

3

27
Q

Test parking brake while your

A

Parked

28
Q

When you fan your brakes it doesn’t allow for cooling TRUE or FALSE

A

True

29
Q

Hydraulic braking takes longer because of flow time TRUE or FALSE

A

True

30
Q

______ _______ _____ makes the total stopping distance for air brakes longer than hydraulic brakes.

A

Brake lag distance

31
Q

Warning will show when air pressure falls below

A

60 psi

32
Q

Safety relief valve opens at ____ psi

A

150

33
Q

When some air brake systems are doing more work than others the brakes will develop more heat , fade & vehicle handling will be affected.
TRUE OR false.

A

True

34
Q

True if false . Your safety release valve needs immediate attention when relief valve has opens several times.

A

True

35
Q

Test compressor on dual air brakes systems by letting pressure build up between ____& ____.

A

85-100

36
Q

Spring brakes are held on by ____& ____.

A

Electrical & hydraulic

37
Q

Nth is can cause ALL AIR BRAKES to have less power

A

Out of adjustment

38
Q

Air brakes use ______air

A

Compressed

CDL PERMIT (3 decks)

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