Deck 106: Abs Components and Operation

Question 1

Technician A says that the ABS system may not result in shorter stopping distance compared to brakes without ABS. Technician B says that a pulsating brake pedal during normal braking is a characteristic feature of most ABS-equipped vehicles. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Answer 1

Both technicians A and B

Question 2

The maximum traction between a tire and the road occurs when the tire is ________.

A)Locked and skidding
B)Slipping 10% to 20%
C)Slipping 80% to 90%
D)Rotating freely

Answer 2

Slipping 10% to 20%

Question 3

Technician A says that ABS-equipped vehicles can stop quickly and without skidding on all road surfaces even if covered with ice. Technician B says that steering is possible during an ABS stop. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Answer 3

Technician B only

Question 4

A customer wanted the ABS checked because of tire chirp noise during hard braking. Technician A says that the speed sensors may be defective. Technician B says that tire chirp is normal during an ABS stop on dry pavement. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 5

Two technicians are discussing ABS wheel speed sensors. Technician A says that some ABS systems use a sensor located in the rear-axle pinion gear area. Technician B says that all ABS systems use a wheel speed sensor at each wheel. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 6

Technician A says that most ABS units are non-integral.. Technician B says that the ABS is disabled (does not function) below about 5 mph (8 km/h). Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 7

Which type of antilock braking system (ABS) requires the use of four wheel speed sensors?

A)Four channel
B)Two channel
C)Three channel
D)One channel

Question 8

Technician A says that ABS brakes are designed to allow the front wheel to be steered during heavy braking. Technician B says that the ABS dash warning lamp is amber. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 9

The faster a wheel rotates, the higher the frequency produced by a wheel speed sensor.

Question 10

Technician A says that some wheel speed sensors are enclosed in a wheel bearing assembly. Technician B says that some wheel speed sensors are exposed to possible damage from road debris. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 11

Before servicing the brakes in a typical integral ABS, the technician should pump the brake pedal ________.

A)5 to 10 times
B)3 or 4 times
C)2 or 3 times
D)25 times or more

Question 12

Magnetic wheel speed sensors are being discussed. Technician A says that the wheel speed sensors are magnetic. Technician B says that the toothed sensor ring is magnetic. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 13

Which of the following components is common to all vehicles equipped with ABS?

A)Pressure relief valves
B)Hydraulic control unit
C)Combination valve assembly
D)Pedal travel sensor

Question 14

The ABS computer uses the ________ signal from a wheel speed sensor.

A)Resistance
B)Electro-magnetic
C)Voltage
D)Frequency

Question 15

Which of the following is NOT a function of an antilock brake system (ABS)?

A)Helps maintain vehicle control while braking
B)Maintain directional stability on slippery surfaces
C)Allows drivers to drive more closely to the vehicle in front
D)Allow elimination of the proportioning valve

Question 16

Technician A says an antilock system that operates on the select-low principle will control each rear wheel individually. Technician B says systems using the select-low principle regulates rear wheel brake pressure to both rear wheel simultaneously. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 17

Technician A says an antilock brake system will always produce the shortest possible stops. Technician B says when braking on loose gravel or dirt, a system that can lock the wheels produces shorter stops than an antilock system. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 18

Which antilock component creates current frequencies that change with wheel rotational speed?

A)Safety circuitry
B)Wheel speed sensors
C)Modulator assembly
D)Electronic control unit

Question 19

Technician A says digital wheel speed sensors produce a variable frequency AC voltage. Technician B says digital wheel speed sensors use a DC reference voltage supply and produce a square wave signal. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 20

A technician is trying to identify which type of antilock system is installed on a vehicle. A speed sensor is attached to the rear differential housing. Which type of system could this be?

A)Three-channel ABS
B)Five-channel ABS
C)Two-channel ABS
D)Four-channel ABS

Question 21

Technician A says an ABS antilock system decreases pressure to the hydraulic brake circuits on wheels with excessive wheel slippage during deceleration. Technician B says a traction control system increases pressure to the hydraulic brake circuit on wheels with excessive wheel slippage during acceleration. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 22

The standard ABS control strategy uses a three step cycle. These are ________.

A)ABS on, ABS off, and ABS hunting
B)Pressure maintain, pressure hold, and pressure accumulate
C)Pressure hold, pressure decrease, and pressure increase
D)Slipping, holding, and increasing

Question 23

Which of these is a 3 channel antilock brake system?

A)A
B)B
C)C
D)All of these are 4 channel systems

Question 24

What type of antilock brake system is illustrated?

A)RWAL
B)Linear
C)Non-integral
D)Integral