BRAKES CH. 16-18 EXAM QUESTIONS
WITH COMPLETE ANSWERS
Tech A - Answer-Technician A says power brakes were developed because of
increased vehicle weight and increased speed capabilities. Technician B says disc
brakes systems all operate with power assist. Which technician is correct?
Tech A - Answer-Two technicians are discussing vacuum brake boosters. Technician A
says that a low, soft brake pedal is an indication of a defective booster. Technician B
says that there should be at least two power-assisted brake applications after the
engine stops running. Which technician is correct?
Both tech A and B - Answer-Technician A says that to check the operation of a vacuum
brake booster, the brake pedal should be depressed until the assist is depleted and
then start the engine. Technician B says that the brake pedal should drop when the
engine starts, if the booster is okay. Which technician is correct?
D. sink slightly toward the floor, then push back
against your foot. - Answer-When performing a hydro-boost brake booster function test
the brake pedal should be depressed several times to discharge the accumulator. When
the engine is started, with your foot on the brake pedal, the pedal should:
A. push back against your foot.
B. push back then sink slightly toward the floor.
C. sink slightly toward the floor.
D. sink slightly toward the floor, then push back
against your foot.
A. Hard brake pedal - Answer-A defective vacuum brake booster will cause a:
A. Hard brake pedal
B. Soft (spongy) brake pedal
C. Slight hiss noise when the brake pedal is
depressed
D. Low brake pedal
E. Any of the above depending on the fault.
D. trap gasoline vapors to keep them from entering the booster - Answer-The purpose
of the charcoal filter in the vacuum hose between the engine and the vacuum brake
booster is to:
A. filter the air entering the engine from the
power booster.
B. dampen the vacuum fluctuations from the
engine.
C. act as a one-way check valve to help keep a
vacuum reserve in the booster
, D. trap gasoline vapors to keep them from
entering the booster
B. 5 and 20 percent - Answer-Modern antilock brake systems typically hold tire slip on
dry pavement to between:
A. 0 and 10 percent
B. 5 and 20 percent
C. 10 and 30 percent
D. 20 and 40 percent
D. Discharge the accumulator - Answer-What precaution should be taken before
servicing an ABS that uses a high pressure accumulator?
A. Drain the fluid before service
B. Disconnect the negative cable from the
battery
C. Remove the air bag fuse
D. Discharge the accumulator
Tech B - Answer-Technician A says an antilock brake system will always produce the
shortest possible stops. Technician B says when braking on loose gravel or dirt, a
system that can lock the wheels can produce shorter stops than an antilock system.
Which technician is correct?
A. Frequency - Answer-The ABS control module uses the ________ signal from a
wheel speed sensor.
A. Frequency
B. Voltage
C. Resistance
D. Amperage
C. Allows drivers to drive more closely to the vehicle in front - Answer-Which of the
following is NOT a function of an antilock brake system (ABS)?
A. Maintain directional stability on slippery
surfaces
B. Helps maintain vehicle control while braking
C. Allows drivers to drive more closely to the
vehicle in front
D. Regenerates fluid condition
C. They open and close hydraulic passageways - Answer-What is the function of the
ABS solenoids?
A. They create pressure on the brake pedal
B. To initiate master cylinder pressure
C. They open and close hydraulic passageways
D. They directly apply the brake pads
WITH COMPLETE ANSWERS
Tech A - Answer-Technician A says power brakes were developed because of
increased vehicle weight and increased speed capabilities. Technician B says disc
brakes systems all operate with power assist. Which technician is correct?
Tech A - Answer-Two technicians are discussing vacuum brake boosters. Technician A
says that a low, soft brake pedal is an indication of a defective booster. Technician B
says that there should be at least two power-assisted brake applications after the
engine stops running. Which technician is correct?
Both tech A and B - Answer-Technician A says that to check the operation of a vacuum
brake booster, the brake pedal should be depressed until the assist is depleted and
then start the engine. Technician B says that the brake pedal should drop when the
engine starts, if the booster is okay. Which technician is correct?
D. sink slightly toward the floor, then push back
against your foot. - Answer-When performing a hydro-boost brake booster function test
the brake pedal should be depressed several times to discharge the accumulator. When
the engine is started, with your foot on the brake pedal, the pedal should:
A. push back against your foot.
B. push back then sink slightly toward the floor.
C. sink slightly toward the floor.
D. sink slightly toward the floor, then push back
against your foot.
A. Hard brake pedal - Answer-A defective vacuum brake booster will cause a:
A. Hard brake pedal
B. Soft (spongy) brake pedal
C. Slight hiss noise when the brake pedal is
depressed
D. Low brake pedal
E. Any of the above depending on the fault.
D. trap gasoline vapors to keep them from entering the booster - Answer-The purpose
of the charcoal filter in the vacuum hose between the engine and the vacuum brake
booster is to:
A. filter the air entering the engine from the
power booster.
B. dampen the vacuum fluctuations from the
engine.
C. act as a one-way check valve to help keep a
vacuum reserve in the booster
, D. trap gasoline vapors to keep them from
entering the booster
B. 5 and 20 percent - Answer-Modern antilock brake systems typically hold tire slip on
dry pavement to between:
A. 0 and 10 percent
B. 5 and 20 percent
C. 10 and 30 percent
D. 20 and 40 percent
D. Discharge the accumulator - Answer-What precaution should be taken before
servicing an ABS that uses a high pressure accumulator?
A. Drain the fluid before service
B. Disconnect the negative cable from the
battery
C. Remove the air bag fuse
D. Discharge the accumulator
Tech B - Answer-Technician A says an antilock brake system will always produce the
shortest possible stops. Technician B says when braking on loose gravel or dirt, a
system that can lock the wheels can produce shorter stops than an antilock system.
Which technician is correct?
A. Frequency - Answer-The ABS control module uses the ________ signal from a
wheel speed sensor.
A. Frequency
B. Voltage
C. Resistance
D. Amperage
C. Allows drivers to drive more closely to the vehicle in front - Answer-Which of the
following is NOT a function of an antilock brake system (ABS)?
A. Maintain directional stability on slippery
surfaces
B. Helps maintain vehicle control while braking
C. Allows drivers to drive more closely to the
vehicle in front
D. Regenerates fluid condition
C. They open and close hydraulic passageways - Answer-What is the function of the
ABS solenoids?
A. They create pressure on the brake pedal
B. To initiate master cylinder pressure
C. They open and close hydraulic passageways
D. They directly apply the brake pads
