AUTO 112 FINAL EXAM (AUTOMOTIVE
BRAKE SYSTEMS) QUESTIONS AND
ANSWERS
What reference voltage is used with the digital wheel speed sensor - Answer-12 volts
DC
Air trapped with a replacement hydraulic unit requires the use of ___ to bleed out the
air. - Answer-A scan tool
The electronic stability control system requires that the vehicle be equipped with what
type of brake system - Answer-Four-channel abs
Which sensor is used by the ESC controller to determine the driver's intended direction -
Answer-Steering wheel positions sensor
A traction control system can often control all of these EXCEPT____ - Answer-Engage
4WD
Tech A says that many traction control system reduces engine torque to help the drive
wheel achieve traction control systems reduce engine torque to help the drive wheels
achieve traction. Tech B says that hydraulic pressure from the electrohydraulic unit may
supply brake fluid pressure to the wheel brake that is spinning during a traction control
event. Which tech is correct? - Answer-Both techs
Tech A says that some vehicles with ESC continuously monitor wheel speed conditions
and modulate hydraulic force to individual wheels to maintain stability. Tech B says that
vehicles that use traction control systems can reduce engine torque in slippery driving
conditions. Which tech is correct? - Answer-Both Techs
In the drawing, the vehicle is track is "A" if driven a little too fast, the actual track is "B".
This condition is known as ____ - Answer-Understeer
During braking on a hybrid electrical vehicle equipped with a regenerative braking
system, what occurs when the driver depresses the brake pedal? - Answer-The motor
becomes a generator
Two techs are discussing drum brake shoes. Tech A says that forward and rear-facing
shoes are the same and can be installed in either position on any drum brake system.
Tech B says that the darker color lining should always be placed toward the front of the
vehicle. Which tech is correct? - Answer-Neither tech
, Tech A says that drum brakes can fail to slow the vehicle if driven through deep water.
Tech B says that when drum brakes get hot, the brake pedal will drop because the drum
expands away from the shoes. Which tech is correct? - Answer-Both techs
Drum brakes shoes____ - Answer-All of the above are possible
After assembling a drum brake, it was discovered that the brake drum would not fit over
the new brake shoes. Tech A says that the parking brake cable may not have been fully
released. Tech B says to check to see if both shoes are contracting the anchor pin.
Which tech is correct? - Answer-Both techs
Tech A says that most experts recommend replacing all drum brake hardware, including
the spring, every time the brake linings are replaced. Tech B says that the star wheel
adjuster must be cleaned and lubricated to ensure proper operation. Which is correct? -
Answer-Both techs
Two techs are discussing the reason that the brake fluid level in the master cylinder
drops. Tech A says that it may be normal due to the wear of the disc brake pads. Tech
B says that a low brake fluid level may indicate a hydraulic leak somewhere in the
system. Which tech is correct? - Answer-Both techs
Two techs are discussing a floating-type disc brake caliper. Tech A says that if the
caliper slides are corroded, one pad may wear more than the other pad on the same
wheel brake. Tech B says that if a caliper slide is corroded, reduced braking may occur.
Which tech is correct? - Answer-Both techs
Single piston type disc brakes are adjusted by___ - Answer-Piston movement through
the seal
Tech A says that disc brakes are self-adjusting and the brake's pada height should not
become lower as the disc brake pads wear. Tech B says that as the disc brake pads
wear, the level of brake fluid in the master cylinder reservoir drops. Which tech is
correct? - Answer-Both techs
Mechanical fade is NOT a problem with disc brakes because____ - Answer-The brake
rotor expands toward the brake lining as it heats up
Uneven disc brake pad wear is being discussed. Tech A says the caliper piston may be
stuck. Tech B says the caliper may be stuck on the slides and unable to "float". Which
tech is correct? - Answer-Both techs
A "chirping" noise is heard while the vehicle is moving forward, but it stops when the
brakes are applied. Tech A says that the noise is likely caused by the disc brake pad
wear sensor. Tech B says the noise is likely a wheel bearing because the noise stops
when the brakes are applied. Which tech is correct? - Answer-Tech A only
BRAKE SYSTEMS) QUESTIONS AND
ANSWERS
What reference voltage is used with the digital wheel speed sensor - Answer-12 volts
DC
Air trapped with a replacement hydraulic unit requires the use of ___ to bleed out the
air. - Answer-A scan tool
The electronic stability control system requires that the vehicle be equipped with what
type of brake system - Answer-Four-channel abs
Which sensor is used by the ESC controller to determine the driver's intended direction -
Answer-Steering wheel positions sensor
A traction control system can often control all of these EXCEPT____ - Answer-Engage
4WD
Tech A says that many traction control system reduces engine torque to help the drive
wheel achieve traction control systems reduce engine torque to help the drive wheels
achieve traction. Tech B says that hydraulic pressure from the electrohydraulic unit may
supply brake fluid pressure to the wheel brake that is spinning during a traction control
event. Which tech is correct? - Answer-Both techs
Tech A says that some vehicles with ESC continuously monitor wheel speed conditions
and modulate hydraulic force to individual wheels to maintain stability. Tech B says that
vehicles that use traction control systems can reduce engine torque in slippery driving
conditions. Which tech is correct? - Answer-Both Techs
In the drawing, the vehicle is track is "A" if driven a little too fast, the actual track is "B".
This condition is known as ____ - Answer-Understeer
During braking on a hybrid electrical vehicle equipped with a regenerative braking
system, what occurs when the driver depresses the brake pedal? - Answer-The motor
becomes a generator
Two techs are discussing drum brake shoes. Tech A says that forward and rear-facing
shoes are the same and can be installed in either position on any drum brake system.
Tech B says that the darker color lining should always be placed toward the front of the
vehicle. Which tech is correct? - Answer-Neither tech
, Tech A says that drum brakes can fail to slow the vehicle if driven through deep water.
Tech B says that when drum brakes get hot, the brake pedal will drop because the drum
expands away from the shoes. Which tech is correct? - Answer-Both techs
Drum brakes shoes____ - Answer-All of the above are possible
After assembling a drum brake, it was discovered that the brake drum would not fit over
the new brake shoes. Tech A says that the parking brake cable may not have been fully
released. Tech B says to check to see if both shoes are contracting the anchor pin.
Which tech is correct? - Answer-Both techs
Tech A says that most experts recommend replacing all drum brake hardware, including
the spring, every time the brake linings are replaced. Tech B says that the star wheel
adjuster must be cleaned and lubricated to ensure proper operation. Which is correct? -
Answer-Both techs
Two techs are discussing the reason that the brake fluid level in the master cylinder
drops. Tech A says that it may be normal due to the wear of the disc brake pads. Tech
B says that a low brake fluid level may indicate a hydraulic leak somewhere in the
system. Which tech is correct? - Answer-Both techs
Two techs are discussing a floating-type disc brake caliper. Tech A says that if the
caliper slides are corroded, one pad may wear more than the other pad on the same
wheel brake. Tech B says that if a caliper slide is corroded, reduced braking may occur.
Which tech is correct? - Answer-Both techs
Single piston type disc brakes are adjusted by___ - Answer-Piston movement through
the seal
Tech A says that disc brakes are self-adjusting and the brake's pada height should not
become lower as the disc brake pads wear. Tech B says that as the disc brake pads
wear, the level of brake fluid in the master cylinder reservoir drops. Which tech is
correct? - Answer-Both techs
Mechanical fade is NOT a problem with disc brakes because____ - Answer-The brake
rotor expands toward the brake lining as it heats up
Uneven disc brake pad wear is being discussed. Tech A says the caliper piston may be
stuck. Tech B says the caliper may be stuck on the slides and unable to "float". Which
tech is correct? - Answer-Both techs
A "chirping" noise is heard while the vehicle is moving forward, but it stops when the
brakes are applied. Tech A says that the noise is likely caused by the disc brake pad
wear sensor. Tech B says the noise is likely a wheel bearing because the noise stops
when the brakes are applied. Which tech is correct? - Answer-Tech A only
