Ca - Truck/Tractor Air Brake System Components - Part A Flashcards

1
Q

When air brake compressor piston is on its compression stroke, the inlet valve:

A

Is closed and the discharge valve is open.

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2
Q

When the compressor is in its unloaded cycle:

A

The inlet valves are held open.

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3
Q

The governor controls maximum air system pressure by:

A

Putting the compressor in the unloaded cycle.

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4
Q

The automatic drain valve drains moisture and contamination from the reservoir when:

A

Any drop in reservoir pressure.

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5
Q

Air brake antifreeze is used in the air brake system to:

A

Prevent moisture in the system from freezing.

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6
Q

Desiccant type air dryers rely on:

A

Beads that absorb moisture vapour from the air stream.

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7
Q

Single check valves are installed in the inlet line to both the primary and the secondary reservoirs because they:

A

Prevent air loss in the event of a failure in other reservoirs.

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8
Q

The function of the safety valve is to:

A

Limit air pressure buildup in the event of a governor failure.

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9
Q

CMVSS 121 states the minimum pressure at which the low pressure warning devices must warn the operator is:

A

60 psi (414 kPa)

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10
Q

Nylon air brake tubing should not be used where it may be exposed to:

A

High temperatures, abrasion and wear, and excessive movement.

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11
Q

In the released position, the inlet/exhaust valves of the dual-circuit brake valve are in the following condition:

A

Inlets are closed and exhausts are open.

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12
Q

The dual-circuit brake valve holds its inlet and exhaust valves closed:

A

When the valve is in its balanced position.

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13
Q

The function of the relay valve in the primary brake circuit is to speed up the:

A

Application and release of the primary service brakes.

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14
Q

When the dual-circuit brake valve delivers 20 psi (138 kPa) of primary service application pressure, a relay valve with a cracking pressure of 2.5 psi (17.2 kPa) reacts by sending:

A

17.5 psi (120.6 kPa) to the primary brake chambers.

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15
Q

A type 24 brake chamber has a/an:

A

Area of 24 in squared.

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16
Q

During normal brake applications, the secondary section of the dual-circuit brake valve is applied by:

A

Primary service air pressure.

17
Q

The function of the quick release valve in the secondary brake circuit is to:

A

Speed up the release of the secondary service brakes.