ASE A5 Brakes 80 CORRECTLY ANSWERED QUESTIONS LATEST UPDATE
Course
NURSING 706
Institution
NURSING 706
ASE A5 - Brakes 80 CORRECTLY ANSWERED QUESTIONS LATEST UPDATE
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
T...
ASE A5 - Brakes 80 CORRECTLY ANSWERED
QUESTIONS LATEST UPDATE
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
b. pressure safety switch
c. metering valve
d. residual check valve
Ans: 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.
2). 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
Ans: 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.
3). 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
Ans: 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
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, piston cups tight against the cylinder walls to prevent air from entering the system when
at rest (brakes released).
4). 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
Ans: 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.
5). 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
Ans: 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
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, 6). 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.
Ans: 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.
7). 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.
Ans: 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.
8). 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
Ans: 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.
9). With foot pressure applied, the brake pedal on a vehicle with vacuum assisted power brakes
moves down slightly when the engine is started. tech a says that this condition can be
caused by a leaking power brake booster diaphragm. tech b says that the cause could be a
faulty power brake booster check valve. who is right?
a. technician a only
b. technician b only
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