ASE A5 Brakes Exam Questions With 100%
Complete Solutions
On a car with disc/drum brakes, the front brakes grab quickly when light pedal
| | | | | | | | | | | | | |
pressure is applied. This problem could be caused by a bad:
| | | | | | | | | |
A. Proportioning valve
| |
B. Pressure safety switch
| | |
C. Metering valve
| |
D. Residual check valve - CORRECT ANSWER✔✔-The correct answer is C. The
| | | | | | | | | | | |
metering valve delays the flow of brake fluid to the front calipers until the
| | | | | | | | | | | | | |
pressure in the system rises to a point where the wheel cylinder can overcome
| | | | | | | | | | | | | |
the tension of the brake shoe returning spring. The purpose is to have both front
| | | | | | | | | | | | | | |
and rear brakes apply simultaneously. This prevents the front brakes from locking
| | | | | | | | | | | |
up during light brake applications.
| | | |
The driver of a vehicle with power disc/drum brakes says that the brake pedal
| | | | | | | | | | | | | |
moved slowly to the floor while maintaining pedal pressure at a stoplight. What
| | | | | | | | | | | | |
could cause this problem?
| | |
A. Leaking primary piston cup in master cylinder
| | | | | | |
B. Leaking power brake booster
| | | |
C. Leaking residual check valve in master cylinder
| | | | | | |
D. Internal leak in the combination valve - CORRECT ANSWER✔✔-The correct
| | | | | | | | | | |
answer is A. if the primary piston cup in the master cylinder is leaking, pressure
| | | | | | | | | | | | | | |
will not build up ahead of the primary piston to increase pressure to the rear
| | | | | | | | | | | | | | |
brakes. The piston will then move forward until the spring is compressed enough
| | | | | | | | | | | | |
,to move the secondary piston. Consequently, this internal leak will cause the
| | | | | | | | | | | |
brake pedal to slowly drop to the floor.
| | | | | | |
What is the purpose of the master cylinder residual check valve(s) on vehicles
| | | | | | | | | | | | |
equipped with drum brakes? | | |
A. Allowed the driver to pump up the brakes
| | | | | | | |
B. Prevents air from entering the hydraulic system
| | | | | | |
C. Prevents wheel lockup by reducing the hydraulic pressure
| | | | | | | |
D. Reduces pedal pulsation by controlling hydraulic pressure - CORRECT
| | | | | | | | | |
ANSWER✔✔-The correct answer is B. Residual check valve(s) are used on drum | | | | | | | | | | | |
brakes to keep residual low pressure (slight static pressure) in the brake system at
| | | | | | | | | | | | |
all times even when the brake pedal is released. This pressure (5-20 psi) keeps
| | | | | | | | | | | | | | |
the lips of the wheel cylinder piston cups tight against the cylinder walls to
| | | | | | | | | | | | | |
prevent air from entering the system when at rest (brakes released).
| | | | | | | | | |
A technician has just overhauled the front brakes on a vehicle with front disc and
| | | | | | | | | | | | | | |
rear drum brakes. However, when he attaches a pressure bleeder (pressurized to
| | | | | | | | | | | |
about 25 psi) to the master cylinder, he cannot get any fluid to come out of the
| | | | | | | | | | | | | | | | |
disc brake caliper bleeder screws. Which of the following is MOST LIKELY the
| | | | | | | | | | | | |
cause?
A. Bad proportioning valve
| | |
B. Bad pressure differential valve
| | | |
C. proportioning valve release button not activated
| | | | | |
D. Metering valve release button not activated - CORRECT ANSWER✔✔-The
| | | | | | | | | |
correct answer is D. A metering valve requires a minimum pressure (typically 75-
| | | | | | | | | | | |
125 psi) to open. At this point pressurized fluid flows to the front calipers. Since
| | | | | | | | | | | | | | |
the bleeder tank is only pressurized to 25 psi, fluid pressure is too low to open
| | | | | | | | | | | | | | | |
the metering valve during this procedure, Therefore, when you use a pressure
| | | | | | | | | | | |
,bleeder on a system with a metering valve, you must manually keep the valve
| | | | | | | | | | | | | |
open by either pushing the button in the end of the valve, or pulling the stem
| | | | | | | | | | | | | | | |
outward on the end of the valve. | | | | | |
On a vehicle with single piston floating caliper front disc brakes, the brake pads
| | | | | | | | | | | | | |
on the left side of the vehicle are almost completely worn while the right side is
| | | | | | | | | | | | | | | |
almost new. Tech A says that too much rotor runout could be the cause. Tech B
| | | | | | | | | | | | | | | |
says that a binding caliper piston could be the cause. Who is right?
| | | | | | | | | | | |
A. Technician A only
| | |
B. Technician B only
| | |
C. Both A and B
| | | |
D. Neither A or B - CORRECT ANSWER✔✔-The correct answer is B. Excessive rotor
| | | | | | | | | | | | |
runout would cause a pulsating brake pedal, but not uneven side-to-side pad
| | | | | | | | | | | | |
wear. A frozen caliper piston on the other hand, will keep both inner and outer
| | | | | | | | | | | | | | |
brake pads equally applied against the rotor even when the brake pedal is
| | | | | | | | | | | | |
released. This constant friction will cause rapid pad wear in the affected caliper as
| | | | | | | | | | | | |
well as the front-end pull
| | | | |
A hydraulic brake line is leaking. Which of the following is the correct repair
| | | | | | | | | | | | | |
procedure?
A. Cut out the bad section and replace with new steel tubing using compression
| | | | | | | | | | | | | |
fittings.
B. Replace the leaking line with double-flared, seamless copper tubing.
| | | | | | | | |
C. Cut out the bad section and replaced with single-flared steel tubing using flare
| | | | | | | | | | | | | |
nuts and unions.| |
D. Replace the leaking line with double-flared steel tubing. - CORRECT
| | | | | | | | | | |
ANSWER✔✔-The correct answer is D. Steel tubing of the same size, type, and | | | | | | | | | | | | |
, length with double flared ends must be used when replacing a traditional SAE
| | | | | | | | | | | | |
double inverted flair style hydraulic brake line.
| | | | | |
Which of the following problems would be caused by using a residual check valve
| | | | | | | | | | | | | |
in a disc brake master cylinder?
| | | | |
A. Reduced brake pedal travel
| | | |
B. Reduced brake system pressure
| | | |
C. Increased brake pad wear
| | | |
D. Increased rotor runout. - CORRECT ANSWER✔✔-The correct answer is C. If a
| | | | | | | | | | | | |
residual check valve was installed in a disc brake master cylinder, it would cause
| | | | | | | | | | | | | |
increased brake pad wear since the residual brake pressure would cause the
| | | | | | | | | | | |
caliper pistons to keep the pads applied even when the brake pedal is released.
| | | | | | | | | | | | |
A customer complains that their vehicle pulls to the right when the brakes are
| | | | | | | | | | | | | |
applied. Technician A says a restricted brake line to the left caliper can cause this
| | | | | | | | | | | | | | |
problem. Technician B says a malfunctioning proportioning valve is probably the
| | | | | | | | | | |
cause. Who is right? | | |
A. Technician A only
| | |
B. Technician B only
| | |
C. Both A and B
| | | |
D. Neither A or B - CORRECT ANSWER✔✔-The correct answer is A. A restriction in
| | | | | | | | | | | | | |
the brake line will cause a drop in fluid pressure to the affected caliper. This will
| | | | | | | | | | | | | | | | |
cause the caliper to be unable to exert the same force against the pads as the
| | | | | | | | | | | | | | | |
unrestricted side. because of this, the vehicle will pull to the side where the
| | | | | | | | | | | | | |
pressure is highest and brake force is greatest. In this case, that would be the
| | | | | | | | | | | | | | |
right side. |
Complete Solutions
On a car with disc/drum brakes, the front brakes grab quickly when light pedal
| | | | | | | | | | | | | |
pressure is applied. This problem could be caused by a bad:
| | | | | | | | | |
A. Proportioning valve
| |
B. Pressure safety switch
| | |
C. Metering valve
| |
D. Residual check valve - CORRECT ANSWER✔✔-The correct answer is C. The
| | | | | | | | | | | |
metering valve delays the flow of brake fluid to the front calipers until the
| | | | | | | | | | | | | |
pressure in the system rises to a point where the wheel cylinder can overcome
| | | | | | | | | | | | | |
the tension of the brake shoe returning spring. The purpose is to have both front
| | | | | | | | | | | | | | |
and rear brakes apply simultaneously. This prevents the front brakes from locking
| | | | | | | | | | | |
up during light brake applications.
| | | |
The driver of a vehicle with power disc/drum brakes says that the brake pedal
| | | | | | | | | | | | | |
moved slowly to the floor while maintaining pedal pressure at a stoplight. What
| | | | | | | | | | | | |
could cause this problem?
| | |
A. Leaking primary piston cup in master cylinder
| | | | | | |
B. Leaking power brake booster
| | | |
C. Leaking residual check valve in master cylinder
| | | | | | |
D. Internal leak in the combination valve - CORRECT ANSWER✔✔-The correct
| | | | | | | | | | |
answer is A. if the primary piston cup in the master cylinder is leaking, pressure
| | | | | | | | | | | | | | |
will not build up ahead of the primary piston to increase pressure to the rear
| | | | | | | | | | | | | | |
brakes. The piston will then move forward until the spring is compressed enough
| | | | | | | | | | | | |
,to move the secondary piston. Consequently, this internal leak will cause the
| | | | | | | | | | | |
brake pedal to slowly drop to the floor.
| | | | | | |
What is the purpose of the master cylinder residual check valve(s) on vehicles
| | | | | | | | | | | | |
equipped with drum brakes? | | |
A. Allowed the driver to pump up the brakes
| | | | | | | |
B. Prevents air from entering the hydraulic system
| | | | | | |
C. Prevents wheel lockup by reducing the hydraulic pressure
| | | | | | | |
D. Reduces pedal pulsation by controlling hydraulic pressure - CORRECT
| | | | | | | | | |
ANSWER✔✔-The correct answer is B. Residual check valve(s) are used on drum | | | | | | | | | | | |
brakes to keep residual low pressure (slight static pressure) in the brake system at
| | | | | | | | | | | | |
all times even when the brake pedal is released. This pressure (5-20 psi) keeps
| | | | | | | | | | | | | | |
the lips of the wheel cylinder piston cups tight against the cylinder walls to
| | | | | | | | | | | | | |
prevent air from entering the system when at rest (brakes released).
| | | | | | | | | |
A technician has just overhauled the front brakes on a vehicle with front disc and
| | | | | | | | | | | | | | |
rear drum brakes. However, when he attaches a pressure bleeder (pressurized to
| | | | | | | | | | | |
about 25 psi) to the master cylinder, he cannot get any fluid to come out of the
| | | | | | | | | | | | | | | | |
disc brake caliper bleeder screws. Which of the following is MOST LIKELY the
| | | | | | | | | | | | |
cause?
A. Bad proportioning valve
| | |
B. Bad pressure differential valve
| | | |
C. proportioning valve release button not activated
| | | | | |
D. Metering valve release button not activated - CORRECT ANSWER✔✔-The
| | | | | | | | | |
correct answer is D. A metering valve requires a minimum pressure (typically 75-
| | | | | | | | | | | |
125 psi) to open. At this point pressurized fluid flows to the front calipers. Since
| | | | | | | | | | | | | | |
the bleeder tank is only pressurized to 25 psi, fluid pressure is too low to open
| | | | | | | | | | | | | | | |
the metering valve during this procedure, Therefore, when you use a pressure
| | | | | | | | | | | |
,bleeder on a system with a metering valve, you must manually keep the valve
| | | | | | | | | | | | | |
open by either pushing the button in the end of the valve, or pulling the stem
| | | | | | | | | | | | | | | |
outward on the end of the valve. | | | | | |
On a vehicle with single piston floating caliper front disc brakes, the brake pads
| | | | | | | | | | | | | |
on the left side of the vehicle are almost completely worn while the right side is
| | | | | | | | | | | | | | | |
almost new. Tech A says that too much rotor runout could be the cause. Tech B
| | | | | | | | | | | | | | | |
says that a binding caliper piston could be the cause. Who is right?
| | | | | | | | | | | |
A. Technician A only
| | |
B. Technician B only
| | |
C. Both A and B
| | | |
D. Neither A or B - CORRECT ANSWER✔✔-The correct answer is B. Excessive rotor
| | | | | | | | | | | | |
runout would cause a pulsating brake pedal, but not uneven side-to-side pad
| | | | | | | | | | | | |
wear. A frozen caliper piston on the other hand, will keep both inner and outer
| | | | | | | | | | | | | | |
brake pads equally applied against the rotor even when the brake pedal is
| | | | | | | | | | | | |
released. This constant friction will cause rapid pad wear in the affected caliper as
| | | | | | | | | | | | |
well as the front-end pull
| | | | |
A hydraulic brake line is leaking. Which of the following is the correct repair
| | | | | | | | | | | | | |
procedure?
A. Cut out the bad section and replace with new steel tubing using compression
| | | | | | | | | | | | | |
fittings.
B. Replace the leaking line with double-flared, seamless copper tubing.
| | | | | | | | |
C. Cut out the bad section and replaced with single-flared steel tubing using flare
| | | | | | | | | | | | | |
nuts and unions.| |
D. Replace the leaking line with double-flared steel tubing. - CORRECT
| | | | | | | | | | |
ANSWER✔✔-The correct answer is D. Steel tubing of the same size, type, and | | | | | | | | | | | | |
, length with double flared ends must be used when replacing a traditional SAE
| | | | | | | | | | | | |
double inverted flair style hydraulic brake line.
| | | | | |
Which of the following problems would be caused by using a residual check valve
| | | | | | | | | | | | | |
in a disc brake master cylinder?
| | | | |
A. Reduced brake pedal travel
| | | |
B. Reduced brake system pressure
| | | |
C. Increased brake pad wear
| | | |
D. Increased rotor runout. - CORRECT ANSWER✔✔-The correct answer is C. If a
| | | | | | | | | | | | |
residual check valve was installed in a disc brake master cylinder, it would cause
| | | | | | | | | | | | | |
increased brake pad wear since the residual brake pressure would cause the
| | | | | | | | | | | |
caliper pistons to keep the pads applied even when the brake pedal is released.
| | | | | | | | | | | | |
A customer complains that their vehicle pulls to the right when the brakes are
| | | | | | | | | | | | | |
applied. Technician A says a restricted brake line to the left caliper can cause this
| | | | | | | | | | | | | | |
problem. Technician B says a malfunctioning proportioning valve is probably the
| | | | | | | | | | |
cause. Who is right? | | |
A. Technician A only
| | |
B. Technician B only
| | |
C. Both A and B
| | | |
D. Neither A or B - CORRECT ANSWER✔✔-The correct answer is A. A restriction in
| | | | | | | | | | | | | |
the brake line will cause a drop in fluid pressure to the affected caliper. This will
| | | | | | | | | | | | | | | | |
cause the caliper to be unable to exert the same force against the pads as the
| | | | | | | | | | | | | | | |
unrestricted side. because of this, the vehicle will pull to the side where the
| | | | | | | | | | | | | |
pressure is highest and brake force is greatest. In this case, that would be the
| | | | | | | | | | | | | | |
right side. |
