Deck 59: Antilock Brakes, Traction, and Stability Control

Question 1

The ABS is sometimes used to limit the amount the wheels can spin during acceleration. This is called a(n) ____________________ or acceleration slip regulation (ASR).

Answer 1

traction control system (TCS)
traction control system
TCS

Question 2

All of the following statements are true EXCEPT:

A)four-wheel ABS can be either three channel or four channel.
B)the most effective ABS is the three-channel system with a sensor monitoring each wheel.
C)a three-channel system has a sensor at each front wheel, and the rear works like a single-channel, two-wheel system.
D)most rear-wheel drives and some front-wheel drives use three-channel systems.

Answer 2

B

Question 3

Most newer cars are equipped with computerized ____________________ to limit the amount the wheels can lock up.

Answer 3

antilock brake systems (ABS)
antilock brake systems
ABS

Question 4

Which of the following is LEAST-Likely to be monitored by computer modules as part of an ESC program?

A)Backing plate
B)Wheel speed sensor
C)Yaw rate sensor
D)Steering wheel angle sensor

Question 5

The tool that will MOST-Likely ask you to check a wheel speed sensor for AC voltage output is the:

A)lateral acceleration sensor
B)antilock brake controller
C)wheel speed sensor
D)diagnostic flow chart

Question 6

AC waveforms are prone to radio frequency interference (RFI) with their signals.

Question 7

Many rear-wheel-drive ABS vehicles have a sensor mounted in the differential.

Question 8

While having a discussion, Technician A says that having a sensor at each wheel means that the ABS is four channel. Technician B says that having a sensor at each wheel does not necessarily mean that the ABS is four channel. Some three-channel systems have four-channel braking. Who is correct?

A)A only
B)B only
C)Neither A nor B
D)Both A and B

Question 9

All of the following statements are true EXCEPT:

A)one way to test for ABS operation is to test-drive the vehicle in an empty parking lot.
B)electrical problems are diagnosed using the vehicle's on-board diagnostics.
C)a red light warns the driver that the parking brake is applied.
D)an amber light is the typical hydraulic system warning light.

Question 10

The integral ABS brake system reservoir is usually much smaller than a normal brake system reservoir.

Question 11

In most ABS, ____________________ valves cycle the hold and release of hydraulic system pressure.

Question 12

____________________ applies the brakes to a wheel that is spinning in mud or on ice, sending the torque to the wheel on the other side of the vehicle.

Question 13

If a wheel locks up, a(n) ____________________ pulsates the pressure to that wheel in much the same manner as a race car driver pumps the brakes during a turn to avoid a skid.

Question 14

While having a discussion, Technician A says that the majority of ABS problems result from failure of a wheel speed sensor. Technician B says that some wheel speed sensors fail because of exposure to harsh operating conditions, and others fail due to abuse. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 15

Which of the following statements is LEAST-Likely true?

A)Fluid can be checked for moisture contamination using an electronic moisture tester.
B)Silicone brake fluids are hygroscopic.
C)Do not use DOT 5 (synthetic) brake fluid with ABS.
D)An annual fluid flush is a good recommendation with ABS.

Question 16

A slip rate of 50% means that the wheel is rolling at 25% slower speed than a freely rolling tire at the same vehicle speed.

Question 17

During a two-wheel ABS stop, the isolation valve closes to prevent further hydraulic pressure from reaching the ____.

A)wheel speed sensor
B)front brakes
C)rear brakes
D)solenoid

Question 18

The sensor that is MOST-Likely used on some antilock systems to measure "yaw" forces encountered while turning is the:

A)wheel speed sensor
B)traction control sensor
C)brake sensor
D)lateral acceleration sensor

Question 19

____ is when the ABS operates when it is not supposed to.

A)Overhaul
B)Deceleration
C)False modulation
D)Decay

Question 20

A pulsating pedal during a non-ABS stop could be due to a warped brake drum or thickness variations in a disc rotor.

Question 21

How can you reduce an engine's power output?

Question 22

List five components of hydraulic circuitry.

Question 23

Briefly describe a safe and easy way to flush all brake systems when you do not have a dedicated scan tool for the vehicle.

Question 24

List five examples of an antilock brake system .

Question 25

Briefly describe the stages of ABS solenoid operation.