F - Air Antilock Brake System Fundamentals Flashcards

1
Q

List two advantages when braking a vehicle equipped with antilock brakes.

A

Directional stability and control.

Decreased stopping distances.

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2
Q

Braking is most effective when the rotation of the wheel and tire is slowed:

A

Without overcoming friction between the tire and the road.

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3
Q

The antilock air brake system modulates (?) to slow the vehicle effectively and under control.

A

Brake application pressure.

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4
Q

Antilock brake systems can modulate brake application pressure up to (?) times per second.

A

100

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5
Q

List the basic components of an antilock system.

A

Tone wheel, speed sensor, ECU, ABS indicator lamp, and brake modulator valve.

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6
Q

A modulator valve is in the air lines to each front wheel and to the right driving tandems and the left driving tandems. What type of ABS system is this?

A

4S 4M

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7
Q

The purpose of the tone ring is to:

A

Induce electrical pulses in the speed sensor.

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8
Q

The antilock system’s ECU is a computer that:

A

Analyzes and processes speed sensor signals and controls vehicle speed limitations.

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9
Q

A vehicle is being driven with the ABS indicator light illuminated. This indicates to the driver that:

A

There is an antilock system malfunction.

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10
Q

If the antilock system fails during vehicle operation, the standard brake system will:

A

Function normally.

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11
Q

The tone rings are most commonly mounted to the:

A

Wheel hubs.

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12
Q

On a tandem drive axle truck chassis with one modulator valve for each side, the modulator valve controls:

A

Two brake chambers.

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13
Q

If arc welding must be performed on a vehicle with antilock, the ECU should be:

A

Unplugged or disconnected.

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14
Q

When removing the hub assembly from an antilock equipped vehicle, a technician must:

A

Take care not to damage the tone ring and sensor. Support and block the vehicle safely.

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15
Q

A wheel speed sensor is positioned by:

A

Pushing the sensor in until it touches the tone wheel.

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16
Q

Most antilock systems specify that all tire sizes must be kept within (?) circumference of each other.

A

3/4”