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Brake System Troubleshooting and Maintenance, Exams of Engineering

Pittsburg State University (PSU)Engineering

A comprehensive overview of various brake system components, their functions, and common issues that can arise. It covers a wide range of topics, including the identification of problems related to proportioning valves, pressure safety switches, metering valves, residual check valves, master cylinder issues, brake pedal behavior, brake system pressure, brake pad wear, rotor runout, and parking brake concerns. The document also discusses the use of various tools and techniques for diagnosing and addressing these brake-related problems. By studying this document, readers can gain a deeper understanding of brake system mechanics, troubleshooting procedures, and maintenance best practices to ensure the safe and efficient operation of vehicle brakes.

Typology: Exams

2024/2025

Available from 10/24/2024

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ASE A5 90 Practice Test Questions With

Answers

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 - ✔ ✔ C

2. The driver of a vehicle with power disc/drum brakes

says that the brake pedal moves 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 - ✔ ✔ A

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 - ✔ ✔ C

Partial preview of the text

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ASE A5 90 Practice Test Questions With

Answers

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 - ✔ ✔ C
The driver of a vehicle with power disc/drum brakes says that the brake pedal moves 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 - ✔ ✔ A
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 - ✔ ✔ C

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 - ✔ ✔ B
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 - ✔ ✔ D
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

C. rotor lateral runout D. rotor face wear - ✔ ✔ C

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 - ✔ ✔ C
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 - ✔ ✔ A
With foot pressure applied, the brake pedal on a vehicle with vacuum assisted power brakes moves down slightly when the engine is started. Technician A says that this condition can be caused by a leaking power brake booster diaphragm. Technician 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

C. Both A and B D. Neither A or B - ✔ ✔ D

Technician A says that the tool shown above is used to adjust the brake shoes. Technician B says that the tool shown above is used to determine the inside diameter of the drum. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B - ✔ ✔ A
The hydraulic system on a vehicle with integral ABS is to be bled. Technician A says that the front brakes can be bled in a conventional manner. Technician B says that both front and rear brakes can only be bled using the pressure from a fully charged accumulator. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B - ✔ ✔ A
A driver complains that the ABS system on his car engages every time he applies the brakes on a cobblestone roadway he uses going back-and-forth to work. This condition means that: A. The system is operating normally. B. The wheels are traveling at different speeds.

C. Both A and B D. Neither A or B - ✔ ✔ D

Brakes that drag or fail to release can be caused by which of the following conditions in the master cylinder? A. leaking primary cup B. leaking secondary cup C. failure of the residual pressure check valve D. clogged compensating port - ✔ ✔ D
All of the following could cause a hard brake pedal on a vehicle with power brakes EXCEPT: A. an engine with the valves adjusted too tight B. brake fluid on the linings C. a leak in the brake hydraulic system D. a frozen caliper - ✔ ✔ C
Technician A says that a caliper seal installed in the caliper bore is called a stroking seal. Technician B says that when the brake pedal is released, the piston in the caliper moves back in its bore due to the action of the piston seal. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B - ✔ ✔ B
When replacing disc brake pads, you must bottom the caliper piston in its bore to create room for the new pads.

Which of the following is the proper procedure? A. Use a C-clamp or pliers to slowly bottom the piston in the caliper. B. Remove half the fluid from the master cylinder reservoir, then use a C-clamp or pliers to slowly bottom the piston in the caliper. C. Connect a hose to the caliper bleeder screw and insert the other end of the hose into a suitable container, open the bleeder screw, then use a C-clamp or pliers to slowly bottom the piston in the caliper. D. Remove the caliper from the vehicle, then use a C-clamp or pliers to slowly bottom the piston in the caliper. - ✔ ✔ C

Technician A says that all 3-channel ABS systems use only 3 wheel speed sensors. Technician B says that a 4-channel ABS system means that fluid pressure is independently regulated to each of the wheels during an ABS stop. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B - ✔ ✔ B
Technician A says that when a rotor is machined, an equal amount of material must always be removed from

B. star wheel adjusters C. strut rod D. pushrod - ✔ ✔ A

A customer complains that the brake warning light comes on whenever the brake pedal is depressed while driving. All of the following could cause this to occur EXCEPT: A. a leak in the rear half of the hydraulic system B. a short to ground in the warning light circuit C. a leak in the front half of the hydraulic circuit D. a leaking pressure differential switch - ✔ ✔ B
The MOST common cause for premature front brake pad wear in a disc/drum system is: A. seized calipers B. faulty master cylinder C. improperly adjusted rear shoes D. malfunctioning metering valve - ✔ ✔ C
Technician A says that DTCs can be accessed from any ABS system using flash diagnostics. Technician B says that ABS system tests can be performed with a bi-directional scan tool. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B - ✔ ✔ B

To determine if an intermittent ABS problem is related to an erratic wheel speed sensor signal, which of the following should be used? A. ohmmeter B. voltmeter C. scan tool D. digital storage oscilloscope - ✔ ✔ D
A few minutes after the engine was turned off on a vehicle with vacuum power assist, the brake pedal is applied and it is hard to push. Technician A says that this is a normal condition. Technician B says that the booster check valve is leaking. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B - ✔ ✔ B
The above measurement is made when replacing all of the following components EXCEPT: A. master cylinder B. vacuum power booster C. brake caliper D. master cylinder pushrod - ✔ ✔ C
During a brake inspection, an area of the vacuum brake booster below the master cylinder is found to be damp. Technician A says that this is a normal condition. Technician

tested twice. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B - ✔ ✔ B

All of the following disc brake rotor measurements can be performed using a micrometer EXCEPT: A. parallelism B. thickness C. runout D. taper - ✔ ✔ C
Which of the following disc brake caliper designs usually allow the brake pads to be removed without removing the caliper? A. fixed B. floating C. sliding D. all of the above - ✔ ✔ A
After applying the brake pedal several times to deplete the fluid reserve in the accumulator of a Hydro-Boost system, a technician applies the brake pedal with moderate pressure and starts the engine. What should the technician feel at the pedal if the Hydro-Boost system is operating properly? A. The pedal should initially rise before moving

downward. B. The pedal should initially move downward before rising up. C. The pedal should move downward. D. The pedal should rise. - ✔ ✔ B

All of the following can cause disc brake squeal EXCEPT: A. loose or missing anti-rattle springs B. grease on the linings C. glazed linings D. dirt embedded in the linings - ✔ ✔ B
Technician A says that when rebuilding a caliper with a stroking seal, the condition of the caliper bore surface is critical. Technician B says that when rebuilding a caliper with a fixed seal, the condition of the piston surface is the most important consideration. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B - ✔ ✔ C
All of the following can cause a vehicle to pull to one side when the brakes are applied EXCEPT: A. seized caliper piston B. worn strut rod bushings C. blocked master cylinder compensating port

To determine the serviceability of a brake drum, all of the following should be checked EXCEPT: A. diameter B. minimum thickness C. out-of-roundness D. taper wear - ✔ ✔ B
A vehicle's brake pedal is pumped rapidly 20 times and then held down. The master cylinder cover is then removed and when the pedal is released, a geyser is seen coming from the reservoir. Technician A says that this indicates that air is trapped in the system. Technician B says that this means that fluid is being forced out of the cylinder bore through the compensating ports and is normal master cylinder operation. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B - ✔ ✔ A
Technician A says that RWAL ABS systems must be diagnosed using a scan tool. Technician B says that the ABS warning light will only come on when there is a fault in the system. Who is right? A. Technician A only B. Technician B only C. Both A and B

D. Neither A or B - ✔ ✔ D

Technician A says that any imperfection found in a phenolic caliper piston warrants replacement. Technician B says that a phenolic caliper piston should be protected with a block of wood when installing it into the caliper bore with a C-clamp. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B - ✔ ✔ B
Which of the following should be used to measure the thickness of a scored rotor? A. vernier caliper B. outside micrometer with flat anvil and spindle C. inside micrometer D. outside micrometer with pointed anvil and spindle - ✔ ✔ D
During routine vehicle maintenance, the fluid level in the master cylinder reservoir is checked. When the reservoir cap is removed, purple colored fluid is found in the reservoir. Technician A says that this means the fluid should be topped off with DOT 4, which has a higher boiling point than regular brake fluid. Technician B says that this means that the fluid is contaminated; all rubber parts in the system must be replaced and the system flushed. Who is right? A. Technician A only

B. Technician B only C. Both A and B D. Neither A or B - ✔ ✔ D

The diameter of drums mounted on the same axle should measure within how many thousands of an inch of one another? A. 0. B. 0. C. 0. D. 0.020 - ✔ ✔ C
Absorption of 3% moisture can reduce the boiling point of DOT 3 brake fluid by what percentage? A. 10% B. 20% C. 25% D. 50% - ✔ ✔ C
All of the following are procedures for removing air from a hydraulic system EXCEPT: A. bench bleeding B. power bleeding C. manual bleeding D. vacuum bleeding - ✔ ✔ A
All of the following can be used to apply a nondirectional finish to a disc brake rotor EXCEPT: A. sanding block

B. fine file C. lathe attachment D. sanding disc - ✔ ✔ B

All of the following can cause a problem in the Hydro- Boost system EXCEPT: A. loose power steering pump belt B. leaking power steering hoses C. low power steering pump pressure D. leaking check valve - ✔ ✔ D
A customer says that he has just replaced his front disc brake pads himself and now the ABS warning light is on. Which of the following could be the cause? A. damaged wheel speed sensor B. incorrect wheel speed sensor gap C. stuck ABS solenoid valve D. all of the above - ✔ ✔ D
Drum brake drag can be caused by all of the following EXCEPT: A. frozen parking brake cables B. frozen star wheel C. restricted brake hose D. swelled wheel cylinder cups - ✔ ✔ B
Technician A says the type of fitting shown above is common to all brake systems. Technician B says the flare shown was formed with an inverted flaring tool. Who is

Brake System Troubleshooting and Maintenance, Exams of Engineering

Related documents

Partial preview of the text

Download Brake System Troubleshooting and Maintenance and more Exams Engineering in PDF only on Docsity!

ASE A5 90 Practice Test Questions With

Answers