Deck 10: Electrical Braking Systems

Question 1

Technician A says the probable cause of brakes grabbing is hard spots on front discs or rear drums, or cracked pads or shoe linings. Technician B says the probable cause of low-speed disc brake squeak is threaded drums. Who is correct?

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

Answer 1

A

Question 2

Technician A says that pumping the brake pedal on a vehicle with antilock brakes aids the operation of the antilock system in preventing wheel lock up. Technician B says that rapidly pumping the brake pedal may turn the ABS warning lamp on, set a DTC and disable the ABS . Who is correct?

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

Answer 2

B

Question 3

Brake bleeding ABS systems are being discussed. Technician A says that Some manufacturers state that either pressure bleeding or manual bleeding is acceptable for their various ABS installations. Others specify either one method or the other . Technician B says Use only the DOT 3, DOT 4, or synthetic brake fluid specified by the vehicle manufacturer . Who is correct?

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

Answer 3

C

Question 4

The Continental Teves Mk60/Mk70, system has hydraulic brake assist that increases pressure to the brakes whenever a(an)  ____  is detected through the brake pedal sensor.

A)object in the road ahead
B)panic stop
C)positive wheel slip
D)negative wheel slip

Question 5

__________ indicates the amount of time on versus time off.

A)Frequency
B)Duty cycle
C)Resistance
D)Multiplexing

Question 6

The DBC-7 ABS provides all of the following EXCEPT:

A)programming for dynamic rear proportioning.
B)tire inflation monitoring system.
C)it provides codes in text message format.
D)enhanced traction system and traction control system.

Question 7

Technician A says the first code retrieved should be the first repair made. Technician B says the last code in a code series is the first repair since that one was the last set. Who is correct?

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

Question 8

Usually the speed sensor for a RWAL or RABS system was located on (in):

A)the differential housing.
B)the transmission.
C)the transfer case.
D)all of the above.

Question 9

Technician A says the antilock controller or microprocessor is the computer for the ABS. Technician B says m ost automotive computers, including the EBCM, are programmed with an adaptive memory capability or learning mode . Who is correct?

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

Question 10

Which of the following is a four-channel ABS system?

A)Continental Teves mk60
B)DBC-7
C)Continental Teves mk70
D)Bosch ABS 9.0

Question 11

Diagnosing a DBC-7 system is being discussed. Technician A says that the system must be depressurized before retrieving DTCs. Technician B says that thoroughly inspecting the vehicle and speed sensor harness is one of the first steps in proper diagnosis. Who is correct?

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

Question 12

___________ is the number of times a cycle occurs within one second.

A)Duty cycle
B)Duration
C)Multiplexing
D)Frequency

Question 13

Magneto-resistive sensors are being discussed. Technician A says these sensors produce an AC voltage signal. Technician B says these sensors are supplied with voltage from the EBCM. Who is correct?

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

Question 14

RWAL/RABS systems are being discussed. Technician A says the system uses four-wheel speed sensors. Technician B says the system essentially controls wheel skid on the rear wheels. Who is correct?

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

Question 15

Technician A says each manufacturer uses the same speed sensors to ease diagnostics. Technician B says each manufacturer and sometimes different ABS systems use different diagnostic procedures. Who is correct?

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

Question 16

Technician A says dynamic rear proportioning replaces the old mechanical proportioning valves with ABS action to prevent rear wheel lock up during heavy braking. Technician B says an enhanced traction system can control wheel slippage in some cases by simply reducing the output torque of the engine by reducing engine timing, cutting, cylinders, reducing the throttle opening, or reducing fuel delivery. Who is correct?

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

Question 17

Technician A says the first step in road testing for an ABS problem is to check the red brake warning light. Technician B says if the red lamp is lit, the brakes may not be operating properly. Who is correct?

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

Question 18

The primary manufacturers of ABSs including all of the following EXCEPT:

A)Bosch.
B)Ford Motor Company.
C)Continental Teves.
D)Delphi Chassis.

Question 19

Technician A says active brakes can warn the driver of an impending crash. Technician B says active brakes do not actually apply the brakes if necessary to avoid a crash. Who is correct?

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

Question 20

Technician A says tire inflation monitoring is part of the ABS on some vehicles. Technician B says the parking brake is part of the ABS on some vehicles. Who is correct?

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

Question 21

What should you look for when checking connectors for damage?

Question 22

Explain the different types of wheel speed sensor signals.

Question 23

List the features of the DBC-7 system.

Question 24

If the computer recognizes a condition that is not correct, it records a:

A)soft code
B)diagnostic trouble code
C)history code
D)continuous memory code

Question 25

Technician A says t he DBC-7 uses dynamic rear proportioning (DRP)to control rear brake pressure during normal braking . Technician B says t he DBC-7 has two possible traction control systems: enhanced traction system  (ETS)and TCS . Who is correct?

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

Question 26

Wheel speed sensor failures on newer vehicles are being discussed. Technician A says a code is usually set when a sensor has an erratic signal. Technician B says a code is usually set when a sensor is open. Who is correct?

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

Question 27

Which of the following is a leading trigger to turn on ABS warning lamps?

A)Dirty or contaminated fluid
B)Dirty or damaged wheel speed sensors
C)A defective controller
D)A defective hydraulic module

Question 28

Define history codes.

Question 29

Explain the difference between an integrated and a nonintegrated ABS system.

Question 30

List five features of the Continental Teves Mk60/Mk70 system.

Question 31

What does the acronym CAB stand for?

Question 32

Depressurizing accumulators is being discussed. Technician A says some systems are bled without depressurizing. Technician B says some systems must be depressurized before checking the fluid level. Who is correct?

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

Question 33

Define reluctor.

Question 34

Delphi DBC-7 systems are used almost exclusively on ____ vehicles.

A)Ford Motor Company
B)General Motors
C)Toyota
D)Daimler Chrysler

Question 35

Diagnosing an integral ABS system is being discussed . Technician A says some integral ABS systems have a high pressure accumulator. Technician B says some integral ABS systems use high pressure power steering fluid for brake assist . Who is correct?

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

Question 36

ABS system bleeding is being discussed. Technician A says a scan tool must be used to bleed some ABS. Technician B says the base brakes and the ABS must be bled together. Who is correct?

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

Question 37

Technician A says bleeding an ABS is fundamentally the same as bleeding a non-ABS hydraulic system. Technician B says some variety exists in extra steps that may be required for different systems. Who is correct?

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

Question 38

Outline the basic steps the technician should take to troubleshoot intermittent problems.

Question 39

Describe the operation of a magneto-resistive wheel speed sensor.

Question 40

What is a symptom byte?

Question 41

An analog voltage signal is infinitely variable.

Question 42

The ____________________ hydraulic modulator with TCS has two additional valves and an electronic brake traction control module .

Question 43

All Delphi DBC-7 systems are four-channel systems.

Question 44

Class __________ wiring is used within the DBC-7 system for shared communications between networked controllers .

Question 45

A history code indicates a full-time problem that is difficult to diagnose.

Question 46

Hard codes indicate full-time problems that are not too difficult to diagnose.

Question 47

Delphi DBC-7 systems are used mainly on ____________________ vehicles.

Question 48

Some symptoms of premature ABS are clicking sounds from the BPMV, pump operation, and/or pedal pulsations, which occur with normal braking that usually does not activate the ABS system .

Question 49

Some ABS accumulators have 2,600 psi of hydraulic pressure in the system whenever the ignition switch is on.

Question 50

Most ABS systems will allow some wheel slip during braking.

Question 51

The ____________________ replaces the standard hydraulic proportioning valve found on many older vehicles .

Question 52

____________________ is the term applied to the communications on the vehicle computer system .

Question 53

The automated bleed procedure uses a scan tool to actuate the solenoids in the hydraulic modulator while doing a brake bleeding procedure.

Question 54

____________________are normally used to change electrical energy into mechanical action .

Question 55

____________________ ABSs come in two configurations: three-channel and four-channel .

Question 56

The Ford Flex bleeding procedure says that the preferred method of bleeding the brakes is with a ____________________.

Question 57

All DTCs will cause the ABS warning lamp to illuminate.

Question 58

The __________  __________ procedure will actuate the solenoids in the hydraulic modulator while doing a brake bleeding procedure.

Question 59

The best way to test a wheel speed sensor is with an oscilloscope.

Question 60

Most ABS will only allow partial operation of the service brakes if the ABS has a fault.