190105F

Question 1

Braking is most effective when the rotation of the wheel and tire is slowed?

a) without over coming friction between the tire and the road
b) to complete stop
c) automatically, without driver input
d) without friction between the tire and the road

Answer 1

a) without over coming friction between the tire and the road

Question 2

The antilock air brake system modulates _____ to slow the vehicle effectively and under control?

a) driver pedal force
b)wheel speed signals
c) brake application
d)brake application pressure

Answer 2

d)brake application pressure

Question 3

antilock brake systems can modulate brake application pressure up to ____ times per second

a) 1-3
b) 10
c) 100
d) 1000

Answer 3

c) 100

Question 4

A modulator valve is in the air lines to each from wheel and to the right driving tandems and the left driving tandems. What type of ABS system is this?

a) 2s 4m
b) 4s 4m
c) 4s 6m
d) 6s 6m

Answer 4

b) 4s 4m

Question 5

the purpose of the tone ring is to

a) send the voltage signal to the ECU
b) signal modulator valves
c) induce electrical pulses in the speed sensor
d) emit an audible tone in the even of system failure

Answer 5

c) induce electrical pulses in the speed sensor

Question 6

The anti lock systems ECU is a computer that

a) analyzes and processes speed sensor signals
b) controls the brake modulator valves
c) controls vehicle speed limitations
d) both a and b

Answer 6

d) both a and b

Question 7

The vehicle is being driven with ABS indicator light illuminated. This indicates to the driver that

a) the system is functioning in antilock mode
b) the system has low air pressure
c) there is an antilock system malfunction
d) all braking systems are inoperative

Answer 7

c) there is an antilock system malfunction

Question 8

if the antilock system fails during vehicle operation, the standard brake system will?

a) also be inoperable
b) function normally
c) apply the park brakes automatically
d) apply the service brake automatically

Answer 8

b) function normally

Question 9

The tone rings are most commonly mounted to the?

a) wheel hub
b) steering knuckle
c) brake drums
d) spindles

Answer 9

a) wheel hub

Question 10

On a tandem axle truck chassis with one modulator valve for each side, the modulator valve controls

a) four brake chambers
b) three brake chambers
c) two brake chambers
d) 1 brake chamber

Answer 10

c) two brake chambers

Question 11

If arc welding must be performed on a vehicle with antilock, the ECU should be?

a) unplugged or disconnected
b) wrapped in asbestos
c) unbolted from the frame
d) grounded

Answer 11

a) unplugged or disconnected

Question 12

When removing the hub assembly from an antilock equipped vehicle, a technician must

a) remove the sensor
b) take care not to damage the tone ring and senor
c)support and block the vehicle safety
d) both b and c

Answer 12

d) both b and c

Question 13

a wheel speed sensor is positioned by

a) turning a threaded collar and locknut
b) pushing the senor in until it touches the tone wheel
c) setting the wheel bearing endplay
d) a qualified technician

Answer 13

b) pushing the senor in until it touches the tone wheel

Question 14

Most anti lock system specify that all tire sizes must be kept within circumference of each other

a) 1/4”
b) 1/2”
c) 3/4”
d) 1”

Answer 14

c) 3/4”