B - Air Brake System Mechanical Components Flashcards

1
Q

Properly adjusted cam-operated foundation brakes:

A

Keep the brake linings as close to the brake drum as possible without dragging when the brakes are released.

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2
Q

When a cam-operated foundation brake is in the released position, the brake shoe rollers are:

A

In contact with the low cam area.

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3
Q

The linear motion of the brake chamber pushrod is converted to twisting force at the brake camshaft by the:

A

Slack adjuster.

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4
Q

Brake drums must be able to:

A

Provide an acceptable braking surface, withstand high temperatures, and resist distortion.

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5
Q

Brake drum thickness:

A

Affects the drum’s ability to dissipate.

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6
Q

Cam-operated foundation brakes are called:

A

Non-servo brakes.

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7
Q

The term brake fade occurs at excessively high brake temperatures because the:

A

Brake lining coefficient of friction is reduced.

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8
Q

Brake lining edge code identifies the lining by:

A

The initials of the manufacturer, the normal coefficient of friction, and hot coefficient of friction.

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9
Q

Using brake lining with a GAWR that is to low can result in:

A

Brake fade.

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10
Q

During braking, the brake spider transfers torque from the:

A

Brake shoes to the axle housing.

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11
Q

Flat brake cams are often used in steer axle foundation brakes because they:

A

Have a slower rate of application that S-cams.

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12
Q

The foundation brake component that provides a place to adjust brake lining to drum clearance is the:

A

Slack adjuster.

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13
Q

During application, the angle formed between the brake chamber pushrod and the slack adjuster arm should NEVER be:

A

Less than 90 degrees.

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14
Q

One of the most frequent causes of brake failure is:

A

Improper brake adjustment.

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15
Q

The automatic slack adjuster automatically makes a brake adjustment when:

A

The brakes are released.

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16
Q

The advantage that air disc brake configurations provide over cam-operated drum brake configurations is that they:

A

Are not as prone to brake fade.

17
Q

The calliper of an air disc brake must be able to slide on it mounting pins so that the:

A

Outboard brake pad contacts the brake rotor.