Anti-Lock Brake Systems (ABS)

Question 1

The 2 main types of ABS are:

a) platform and peripheral
b) integral and add-on
c) integral and platform
d) add-on and peripheral

Answer 1

b) integral and add-on

Question 2

The 2 main components in ABS are:

a) ECU and HCU
b) ECU and EBCM
c) ECU and CAB
d) HCU and TC

Answer 2

a) ECU and HCU

Question 3

Which of the following is not a currently used system?

a) 1 channel
b) 2 channel
c) 3 channel
d) 4 channel

Answer 3

b) 2 channel

Question 4

Electrically operated pumps are often found in the:

a) ECU
b) WSS
c) HCU
d) Combination valve

Answer 4

c) HCU

Question 5

WSSs are:

a) part of the ECU
b) part of the HCU
c) part of the master cylinder
d) located at the wheels

Answer 5

d) located at the wheels

Question 6

The function performed by the isolation valve in the HCU is to:

a) reduce pressure coming from the master cylinder
b) cause a pressure increase at the wheel cylinder(s) or caliper(s)
c) stop hydraulic pressure, coming from the master cylinder, from further increasing the pressure at the wheel cylinder(s) or caliper(s)
d) prevent the brakes from operating

Answer 6

c) stop hydraulic pressure, coming from the master cylinder, from further increasing the pressure at the wheel cylinder(s) or caliper(s)

Question 7

The ECU cycles the valves in the HCU up to:

a) 5 Hz
b) 15 Hz
c) 50 Hz
d) 100 Hz

Answer 7

b) 15 Hz

Question 8

When there is an ABS failure, the base brake system should:

a) also fail
b) operate as a non-ABS-equipped system
c) be checked for safe operation
d) both b and c

Answer 8

d) both b and c

Question 9

When the amber ABS warning light is on:

a) the vehicle is likely safe to drive
b) the fluid and pedal height should be checked before driving
c) both a and b
d) the vehicle is unsafe to drive

Answer 9

c) both a and b

Question 10

A three-channel system usually has:

a) three hydraulic solenoid valves
b) six hydraulic solenoid valves
c) nine hydraulic solenoid valves
d) twelve hydraulic solenoid valves

Answer 10

b) six hydraulic solenoid valves

Question 11

A three-channel system controls:

a) each wheel independently
b) front and rear brakes as pairs
c) fronts independently and rear as a pair
d) front as a pair and rears independently

Answer 11

c) fronts independently and rear as a pair

Question 12

RWAL has ABS controls on:

a) rear brakes only
b) front brakes only
c) all four wheels
d) front and rear in pairs

Answer 12

a) rear brakes only