Deck 16: Antilock Brakes, Vehicle Stability Control, and Power Assist

Question 1

What is the purpose of the check valve in a vacuum power brake system?

A)It allows vacuum to the booster.
B)It stops the release of vacuum from the booster back to the engine.
C)Both A and B are correct
D)Neither A nor B is correct

Answer 1

C

Question 2

Antilock brake systems (ABS) and electronic stability control (ESC) systems are standard equipment on modern cars and light trucks sold in the United States.

Answer 2

True

Question 3

What type of signal is produced by a permanent-magnet wheel speed sensor?

A)Digital, AC
B)Digital, DC
C)Analog, AC
D)Analog, DC

Answer 3

C

Question 4

The ____________________ commands the electrohydraulic unit to hold, open, or close wheel brake hydraulic circuits depending on wheel slip.

Question 5

____________________ is the rate of change in rotation from around the vehicle's center of gravity.

Question 6

All ABS wheel speed sensors produce an AC voltage signal.

Question 7

An ideal tire slip rate during braking is:

A)less than 20 percent
B)between 20 and 30 percent
C)zero percent
D)100 percent

Question 8

A tire with zero slip is rolling freely, and a tire with 100% slip is locked.

Question 9

Hydraulic assist is supplied by the power steering system to a hydraulic power brake booster.

Question 10

Technician A says vehicles use a lateral acceleration sensor to measure slip rate.Technician B says slip rate is similar to yaw, but is measured as the distance between the lateral speed and the longitudinal speed.Who is correct?

A)A only
B)B only
C)both A and B
D)neither A nor B

Question 11

The amount of traction between the tire and the ground is called __________ __________..

Question 12

The vacuum power booster is mounted to the:

A)firewall in the engine compartment.
B)master cylinder.
C)driver's side inner front fender.
D)front of the booster.

Question 13

In addition to wheel speed sensors, ESC systems also require a _____.

A)steering angle sensor
B)lateral-acceleration sensor
C)yaw sensor
D)all answers are correct

Question 14

Which of the following is NOT a component of an antilock brake system?

A)power steering pump
B)master cylinder
C)solenoid valve body assembly
D)wheel sensors

Question 15

Vacuum __________ uses vacuum supplied by the engine or a vacuum pump.

Question 16

Hydro-boost operates by using the ___________ to provide assist for the brakes.

A)ABS
B)power steering system
C)transmission
D)differential

Question 17

Wheel speed sensors (WSS) contain electric motors, solenoids, and valves that are used to control the flow of brake fluid to each wheel brake.

Question 18

Steering input data is used by the ESC system to determine driver _________.

Question 19

Which of the following is the electronic control unit for the ABS system?

A)active wheel speed sensor
B)analog wheel speed sensor
C)EBCM
D)electrohydraulic unit

Question 20

Integral ABS systems require that the high-pressure ___________ be discharged before any service is performed.

A)control sumps
B)accumulators
C)sump chambers
D)reservoirs