ASE T4 Brakes
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1. 2. The Driver Vehicle Inspection The correct answer is D. Federal Motor Vehicle Safety
Report DVIR should be submitted Standards ( FMVSS ) require the driver to submit a DVIR
: to their motor carrier or owner at the end of each day .
A. according to the vehicle main- The DVIR is used to identify defects or deficiencies that
tenance schedule would result in a mechanical breakdown or effect the safe
B. when a failure occurs operation of a vehicle Once a driver submits the DVIR , a
C. weekly motor carrier or its agent must investigate and repair the
D. daily defect or deficiency .
2. 3. Which of the following cannot 3. The correct answer is C. The governor controls the air
cause a drum on an air - braked compressor output by unloading or cycling it . It has no
vehicle to overheat ? direct effect on the mechanical brake parts . While the
A. an over - tightened brake ad- pressure setting is important to maintain air brake system
juster at that wheel pressure within acceptable limits , an incorrect setting will
B. under - adjusted brake ( s ) else- not cause the drum on an air - braked vehicle to overheat
where on the vehicle . All other choices given , however , will cause overheating
C. too - high governor cut - out problems .
pressure
D. driving downhill in too high a
gear.
3. 4. All the brakes drag on a truck 4. The correct answer is D. Only a brake pedal with no free
with hydraulic brakes . Which of travel will cause all of the brakes to drag . Answer A - air
the following could be the cause ? in the hydraulic system , will cause a spongy pedal , while
A. air in the hydraulic system answer B - too high a vacuum to the power booster , won't
B. too high a vacuum supply to affect brake drag at all . Answer C , a leaking secondary
the power brake booster cup in the master cylinder , could increase pedal travel ,
C. a leaking secondary cup in the but won't cause the brakes to drag .
master cylinder
D. no brake pedal free travel
4.
, ASE T4 Brakes
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5. Which of the following could 5. The correct answer is C. Of the choices given , only
cause a pulsating brake pedal on an out - of - round brake drum can cause pulsation in
a truck with hydraulic brakes ? a hydrau lic brake system . Answer A , zero brake pedal
A. zero brake pedal free travel free travel , will cause a dragging brake condition , but not
B. glazed linings pulsation . Answer B , glazed linings , will affect stopping
C. an out - of - round brake drum performance and noise , and answer D , a frozen wheel
D. a frozen wheel cylinder piston. cylinder , will de grade stopping performance , but will
not cause pulsation.
5. 6. Air pressure gauges change an 6. The correct answer is C. An element inside an air
air pressure signal into an elec- pressure transducer responds to air pressure increase
tronic voltage signal using which or decrease, and the transducer converts that pressure
of the following components ? differentiation into a voltage signal, which is displayed in
A. inductor a proportionate reading on the dash gauge.
B. capacitor
C. transducer
D. regulator
6. 7. Technician A says that linings 7. The correct answer is A. The brake adjuster is connected
worn too thin on an air - braked to a shaft that runs perpendicular to the plane formed by
vehicle can cause the S - camshaft the pushrod and slack adjuster. As the pushrod is extend-
to roll over . Technician B says this ed, the shaft rotates. The shaft, in turn, is connected to
condition can cause excess brake an S-shaped cam between the brake shoes. As the shaft
pedal travel . Who is right ? rotates, so does the cam. The brake shoes are forced apart
A. Technician A only and against the brake drum, creating the friction needed
B. Technician B only to slow the vehicle. Thin brake linings can allow the S-cam
C. Both A and B to roll over, but will not affect brake pedal travel.
D. Neither A or B
7. 8. Spring brakes on an air - braked 8. The correct answer is B. Per Federal Motor Vehicle
vehicle must be able to hold the Safety Standard (FMVSS) 121, the parking brakes must be
vehicle facing uphill or downhill able to hold a vehicle, loaded to its gross weight rating,
, ASE T4 Brakes
Study online at https://quizlet.com/_gf3ffm
on what percent grade ? stationary on a smooth, dry, concrete roadway, facing up-
A. 10 % hill or downhill on a 20% grade. In the emergency mode,
B. 20 % the parking brakes must be able to exert a retarding force
C. 30 % equal to 28% of the gross axle rating.
D. 40 %
8. 9. The driver of a truck with hy- 9. The correct answer is C, both Technicians are right.
draulic brakes says the pedal re- Either condition will cause the driver to notice a low pedal
serve is too low . Technician A says reserve.
the brakes could be out of adjust-
ment Technician B says one brake
system may have failed . Who is
right ?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B
9. 10. The parking brakes fail to ap- 10. The correct answer is D, neither technician is right.
ply on a truck with air brakes . In addition to applying the service brakes used in everyday
Technician A says this could be driving, the brake chambers on the rear tractor axles and
caused by low air pressure in the on the trailer axles apply the parking brakes. These brake
spring brake chamber . Techni chambers (spring brakes) incorporate a second chamber
cian B says this could be caused containing a second diaphragm and a powerful spring.
by a ruptured spring brake di- When the vehicle is in use, air pressure supplied to the
aphragm . Who is right ? spring diaphragm compresses the spring and the parking
A. Technician A only brakes are held off. When the vehicle is parked, the dash
B. Technician B only valves are pulled out. This exhausts spring brake hold-off
C. Both A and B air, allowing the spring to apply the parking brakes. Nei-
D. Neither A or B ther low air pressure in the spring brake chamber nor a
ruptured diaphragm can prevent the parking brake from
being applied.
Study online at https://quizlet.com/_gf3ffm
1. 2. The Driver Vehicle Inspection The correct answer is D. Federal Motor Vehicle Safety
Report DVIR should be submitted Standards ( FMVSS ) require the driver to submit a DVIR
: to their motor carrier or owner at the end of each day .
A. according to the vehicle main- The DVIR is used to identify defects or deficiencies that
tenance schedule would result in a mechanical breakdown or effect the safe
B. when a failure occurs operation of a vehicle Once a driver submits the DVIR , a
C. weekly motor carrier or its agent must investigate and repair the
D. daily defect or deficiency .
2. 3. Which of the following cannot 3. The correct answer is C. The governor controls the air
cause a drum on an air - braked compressor output by unloading or cycling it . It has no
vehicle to overheat ? direct effect on the mechanical brake parts . While the
A. an over - tightened brake ad- pressure setting is important to maintain air brake system
juster at that wheel pressure within acceptable limits , an incorrect setting will
B. under - adjusted brake ( s ) else- not cause the drum on an air - braked vehicle to overheat
where on the vehicle . All other choices given , however , will cause overheating
C. too - high governor cut - out problems .
pressure
D. driving downhill in too high a
gear.
3. 4. All the brakes drag on a truck 4. The correct answer is D. Only a brake pedal with no free
with hydraulic brakes . Which of travel will cause all of the brakes to drag . Answer A - air
the following could be the cause ? in the hydraulic system , will cause a spongy pedal , while
A. air in the hydraulic system answer B - too high a vacuum to the power booster , won't
B. too high a vacuum supply to affect brake drag at all . Answer C , a leaking secondary
the power brake booster cup in the master cylinder , could increase pedal travel ,
C. a leaking secondary cup in the but won't cause the brakes to drag .
master cylinder
D. no brake pedal free travel
4.
, ASE T4 Brakes
Study online at https://quizlet.com/_gf3ffm
5. Which of the following could 5. The correct answer is C. Of the choices given , only
cause a pulsating brake pedal on an out - of - round brake drum can cause pulsation in
a truck with hydraulic brakes ? a hydrau lic brake system . Answer A , zero brake pedal
A. zero brake pedal free travel free travel , will cause a dragging brake condition , but not
B. glazed linings pulsation . Answer B , glazed linings , will affect stopping
C. an out - of - round brake drum performance and noise , and answer D , a frozen wheel
D. a frozen wheel cylinder piston. cylinder , will de grade stopping performance , but will
not cause pulsation.
5. 6. Air pressure gauges change an 6. The correct answer is C. An element inside an air
air pressure signal into an elec- pressure transducer responds to air pressure increase
tronic voltage signal using which or decrease, and the transducer converts that pressure
of the following components ? differentiation into a voltage signal, which is displayed in
A. inductor a proportionate reading on the dash gauge.
B. capacitor
C. transducer
D. regulator
6. 7. Technician A says that linings 7. The correct answer is A. The brake adjuster is connected
worn too thin on an air - braked to a shaft that runs perpendicular to the plane formed by
vehicle can cause the S - camshaft the pushrod and slack adjuster. As the pushrod is extend-
to roll over . Technician B says this ed, the shaft rotates. The shaft, in turn, is connected to
condition can cause excess brake an S-shaped cam between the brake shoes. As the shaft
pedal travel . Who is right ? rotates, so does the cam. The brake shoes are forced apart
A. Technician A only and against the brake drum, creating the friction needed
B. Technician B only to slow the vehicle. Thin brake linings can allow the S-cam
C. Both A and B to roll over, but will not affect brake pedal travel.
D. Neither A or B
7. 8. Spring brakes on an air - braked 8. The correct answer is B. Per Federal Motor Vehicle
vehicle must be able to hold the Safety Standard (FMVSS) 121, the parking brakes must be
vehicle facing uphill or downhill able to hold a vehicle, loaded to its gross weight rating,
, ASE T4 Brakes
Study online at https://quizlet.com/_gf3ffm
on what percent grade ? stationary on a smooth, dry, concrete roadway, facing up-
A. 10 % hill or downhill on a 20% grade. In the emergency mode,
B. 20 % the parking brakes must be able to exert a retarding force
C. 30 % equal to 28% of the gross axle rating.
D. 40 %
8. 9. The driver of a truck with hy- 9. The correct answer is C, both Technicians are right.
draulic brakes says the pedal re- Either condition will cause the driver to notice a low pedal
serve is too low . Technician A says reserve.
the brakes could be out of adjust-
ment Technician B says one brake
system may have failed . Who is
right ?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B
9. 10. The parking brakes fail to ap- 10. The correct answer is D, neither technician is right.
ply on a truck with air brakes . In addition to applying the service brakes used in everyday
Technician A says this could be driving, the brake chambers on the rear tractor axles and
caused by low air pressure in the on the trailer axles apply the parking brakes. These brake
spring brake chamber . Techni chambers (spring brakes) incorporate a second chamber
cian B says this could be caused containing a second diaphragm and a powerful spring.
by a ruptured spring brake di- When the vehicle is in use, air pressure supplied to the
aphragm . Who is right ? spring diaphragm compresses the spring and the parking
A. Technician A only brakes are held off. When the vehicle is parked, the dash
B. Technician B only valves are pulled out. This exhausts spring brake hold-off
C. Both A and B air, allowing the spring to apply the parking brakes. Nei-
D. Neither A or B ther low air pressure in the spring brake chamber nor a
ruptured diaphragm can prevent the parking brake from
being applied.
