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ASE BRAKE EXAM/90 ANSWERED QUESTIONS A+ RATED
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ASE BRAKE EXAM/90 ANSWEREDQUESTIONS A+ RATED
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 return springs.
The purpose is to have both front and rear brakes apply simultaneously. This
prevents the front brakes from locking up during light brake applications. - -
1. 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 not
B. Pressure safety switch
C. Metering valve on on
D. Residual check valve
-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 com- pressed enough to move the secondary piston. Consequently,
this internal leak will cause the brake pedal to slowly drop to the floor. - -2.
The driver of a vehicle with power disc/drum brakes says the brake pedal
moves slowly to the floor while maintaining pedal pressure at a stoplight.
What could cause this W.S 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
-The correct answer is C. Poor rotor parallelism (thick- ness variation) will
cause a pulsating brake pedal. This is due to the caliper piston movement
that occurs as the pad rides over the alternating high and low areas on the
disc. This action forces brake fluid to flow back and forth from the caliper to
the master cylinder, creating the pulsating pedal feedback. - -3. Which of
the following would MOST LIKELY happen if the measurements taken from
the check shown above varied from the manufacturer's specifications?
A. Noisy brake operation
B. Brake grab or pull
C. Pulsating brake pedal
D. Low brake pedal
-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).
- -4. What is the purpose of the master cylinder residual check valve(s) on
vehicles equipped with drum brakes?
A. Allows 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
-The correct answer is D. A metering valve requires a minimum pressure
(typically between 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 on the end of the valve, or pulling the stem outward on the end of the
valve. - -5. 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
-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 a front-
end pull. - -6. 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. Technician A says that too much
rotor runout could be the cause. Technician 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
-The correct answer is C. The parking brake strut bar forces the brake shoes
into the drum when the parking brake is applied. - -7. What is the purpose of
the bar that is being removed from the brake assembly shown below?
A. To equalize the braking force between the shoes during normal braking
B. To center the shoes after each brake application
C. To force the shoes into the drum when the parking brakes are applied
, D. To reduce the distance between the shoes and the drum
-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 flare style hydrau-lic brake line. - -8. A hydraulic brake line
is leaking. Which of the following is the correct repair procedure?
A. Cut out the bad section and replace it 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 replace with single-flared steel tubing using
flare nuts and unions
D. Replace the leaking line with double-flared steel tubing
-The correct answer is C. Lateral runout is the movement of the rotor from
side to side as it rotates on the steering knuckle spindle. The dial-indicator
set-up shown in the illus tration is used to make this measurement once the
wheel bear- ing nut has been tightened (bearing play removed). - -9. The
set-up shown above is used to check:
-The correct answer is C. If a residual check valve was installed in a disc
brake master cylinder, it would cause in- creased 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. - -10. 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
-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. - -11. A customer
complains 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
-The correct answer is D, neither technician is right. With the brake pedal
applied while starting the engine, the pedal should move down slightly
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