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Questions and Answers
Which of the following is the MOST LIKELY cause of pulsation felt through the pedal after a complete front brake service?
Which of the following valves in the hydraulic system switched on the brake light due to brake fluid leaking?
Who is correct regarding integral and non-integral ABS systems?
The diameter of drums mounted on the same axle should measure within how many thousands of an inch of one another?
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Absorption of 3% moisture can reduce the boiling point of DOT 3 brake fluid by what percentage?
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Which of the following are procedures for removing air from a hydraulic system EXCEPT?
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Which of the following can be used to apply a non-directional finish to a disc brake rotor EXCEPT?
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Which of the following can cause a problem in the Hydro-Boost system EXCEPT?
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Which of the following could cause the ABS warning light to turn on after replacing front disc brake pads?
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Drum brake drag can be caused by all of the following EXCEPT?
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Who is correct regarding the fittings common to all brake systems?
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Who is right about adjusting the rear brake shoes before the parking brake?
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Which of the following should be used to clean a disc brake rotor after it is machined?
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Who is correct regarding the connection of a front brake hose?
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Who is right regarding surge bleeding?
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Which of the following is NOT a cause for brake rotor refinishing?
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Who is right regarding new brake shoes adjustment?
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What is the proper course of action when replacing rotors if cast rotors are the only available replacements?
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Which of the following brake symptoms can be caused by wheel bearing problems?
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Which component in the Hydro-Boost system provides power assist if there is a loss of hydraulic pressure?
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Who is right regarding the parking brake adjustment?
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What must be removed when replacing an integral hub/bearing assembly?
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What is the correct procedure for a wheel cylinder repair?
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Who is right about the brake drum number?
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Which of the following could cause the brake warning light to stay illuminated?
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Where should a technician get a brake fluid sample to check its condition accurately?
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Who is right about gravity bleeding?
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What is the MOST cost-efficient method of correcting excessive lateral runout on a disc brake rotor?
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Which technician is correct regarding the burnishing of new brake pads?
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Which could be a cause of the parking brake pedal remaining depressed?
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Who is correct about the Electronic Stability Control (ESC) systems?
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What could cause intermittent ABS activation with no DTCs found?
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Which technician is right about brake fluid corrosion?
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What is the MOST correct wheel cylinder repair procedure?
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What could be wrong if a vehicle's ABS warning light is triggered and shows no DTC for the left front wheel speed sensor?
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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:
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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?
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Which of the following would MOST LIKELY happen if the measurements taken from the check vary from the manufacturer's specifications?
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What is the purpose of the master cylinder residual check valve(s) on vehicles equipped with drum brakes?
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A technician has just overhauled the front brakes on a vehicle with front disc and rear drum brakes. However, he cannot get any fluid to come out of the disc brake caliper bleeder screws. Which of the following is MOST LIKELY the cause?
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On a vehicle with single piston floating caliper front disc brakes, the brake pads on the left side 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?
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What is the purpose of the bar that is being removed from the brake assembly?
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A hydraulic brake line is leaking. Which of the following is the correct repair procedure?
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The set-up shown above is used to check: (dial indicator on rotor face)
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Which of the following problems would be caused by using a residual check valve in a disc brake master cylinder?
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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?
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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?
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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?
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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?
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A driver complains that the ABS system on his car engages every time he applies the brakes on a cobblestone roadway. This condition means that:
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Two technicians are discussing the duo-servo type drum brake design. Technician A says the brake lining on the secondary shoe is usually longer and thicker than the brake lining on the primary shoe. Technician B says the primary shoe is installed toward the rear of the vehicle. Who is right?
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All of the following statements about leading-trailing type drum brakes are true EXCEPT:
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Technician A says that DOT 5 brake fluid has a lower boiling point than DOT 4. Technician B says that DOT 4 brake fluid is silicone-based and should never be used in an ABS system. Who is right?
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Brakes that drag or fail to release can be caused by which of the following conditions in the master cylinder?
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All of the following could cause a hard brake pedal on a vehicle with power brakes EXCEPT:
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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?
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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?
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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?
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Technician A says that when a rotor is machined, an equal amount of material must always be removed from both sides. Technician B says that the minimum thickness dimension cast into the rotor is the dimension that the rotor can be machined to. Who is right?
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The purpose of an anti-lock brake system is to maintain tire (wheel) slip at what level?
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While on a road test, a technician notices that the rear wheels lock up and the car skids when attempting to stop quickly from a high speed. The MOST LIKELY cause of this problem is a defective:
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Excessive slack in the parking brake cables can be eliminated on most vehicles by making an adjustment at the:
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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:
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The MOST common cause for premature front brake pad wear in a disc/drum system is:
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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?
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To determine if an intermittent ABS problem is related to an erratic wheel speed sensor signal, which of the following should be used?
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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?
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The above measurement is made when replacing all of the following components EXCEPT:
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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 B says that any evidence of fluid indicates a leak and the master cylinder must be replaced. Who is right?
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Technician A says that tapered roller bearings can be adjusted using a torque wrench. Technician B says that tapered roller bearings are adjusted using a dial indicator. Who is right?
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All of the following could cause a pulsation to be felt in the brake pedal EXCEPT:
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Technician A says that, when testing a proportioning valve, the pressure at the outlet port to the rear brakes should rise at a faster rate, once transition pressure is reached. Technician B says that vehicles with diagonally-split hydraulic systems must have the proportioning valve tested twice. Who is right?
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All of the following disc brake rotor measurements can be performed using a micrometer EXCEPT:
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Which of the following disc brake caliper designs usually allows the brake pads to be removed without removing the caliper?
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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?
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All of the following can cause disc brake squeal EXCEPT:
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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?
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All of the following can cause a vehicle to pull to one side when the brakes are applied EXCEPT:
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Technician A says that ABS wheel speed sensor gap should be adjusted with a non-magnetic feeler gauge. Technician B says that a paper spacer can be used to adjust ABS wheel speed sensor gap but the paper must be removed before the vehicle is operated. Who is right?
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When discussing wheel bearings, all of the following statements are true EXCEPT:
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All of the following could cause the parking brake to not hold a vehicle on a grade EXCEPT:
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To determine the serviceability of a brake drum, all of the following should be checked EXCEPT:
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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?
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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?
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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?
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Which of the following should be used to measure the thickness of a scored rotor?
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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?
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Study Notes
Brake System Diagnosis and Repairs
- Quick grabbing of front disc/drum brakes with light pedal pressure may indicate a faulty metering valve.
- Brake pedal descending slowly to the floor suggests a leaking primary piston cup in the master cylinder.
- Variance from manufacturer specifications during measurements can lead to a pulsating brake pedal feel.
- The master cylinder's residual check valve functions to prevent air from entering the hydraulic system.
Brake Bleeding and Components
- A pressure bleeder failing to extract fluid from disc caliper bleeders could be due to an inactive metering valve release button.
- Uneven wear on disc brake pads indicates a worsening caliper condition or rotor runout issue.
- Proper procedures for replacing brake lines include using double-flared steel tubing.
Understanding Brake Mechanics
- The design of drum brake systems may rely on components that center shoes or engage the shoes when applying parking brakes.
- Understanding the effects of hydraulic systems and valves is essential; issues like leaking residual pressure check valves can cause dragging brakes.
- Adjustments to the parking brake system are typically made at the equalizer.
ABS and Brake System Behavior
- ABS engages under different speed conditions; it’s essential for maintaining wheel slip within 10-20%.
- When experiencing issues like rear wheel lock-up during quick stops, consider checking the proportioning valve.
- Diagnosing ABS components often requires accessing DTCs with a scan tool and may necessitate observations from a digital storage oscilloscope.
Brake Fluid and Maintenance
- Brake fluid properties differ; for example, DOT 5 has a lower boiling point than DOT 4.
- Contaminated brake fluid requires flushing entire systems and replacing rubber components.
- Signs like rapid geyser-like release from a master cylinder suggest trapped air within the system.
Brake Adjustments and Measurements
- Tapered roller bearings can utilize both torque wrenches and dial indicators for proper adjustments.
- Normal operation in hydraulic and vacuum systems involves specific checks for leaks and piston seal functions.
Common Brake Problems and Solutions
- Problems arising such as dragging brakes can be linked to malfunctioning components or leaks in the hydraulic system.
- Excessive slack in parking brake cables is typically resolved with tune-ups at the equalizer.
- Not all brake issues stem from identical sources; calibration and systemic checks are vital for accurate diagnostics.
Brake Rotor Specifications
- Disc caliper designs allow for quicker pad replacements without disassembly in specific models, typically fixed designs.
- Brake rotor specifications indicate fine tolerances; dimensions on drums must fall within 0.010 inches for effectiveness.
- Assessing rotor performance includes checking for runout and parallelism, generally using standard tools like micrometers.
Learning Techniques and Best Practices
- Understanding theoretical components and their practical implications is critical for effective brake system maintenance and repair.
- Continuous learning in conjunction with hands-on experience assists in linking theoretical knowledge with practical troubleshooting scenarios in brake systems.### Power Steering and Braking System Issues
- Leaking power steering hoses can indicate broader fluid pressure issues.
- Low power steering pump pressure may affect steering performance.
- A leaking check valve can lead to fluid loss and pressure irregularities.
ABS Warning Light Causes
- Replacement of front disc brake pads can trigger the ABS warning light due to:
- Damaged wheel speed sensor
- Incorrect wheel speed sensor gap
- Stuck ABS solenoid valve
- Any of the above issues could require diagnostics when warning lights appear.
Drum Brake Drag Causes
- Drum brake drag may result from:
- Frozen parking brake cables
- Restricted brake hose
- Swelled wheel cylinder cups
- Frozen star wheel is not a typical cause of drag.
Brake Fitting Types
- Types of fittings in brake systems can vary and not all systems use common types.
- Flare types formed with inverted flaring tools are not universally applied.
Brake Adjustment Procedures
- Proper adjustment of rear brake shoes is necessary before adjusting the parking brake.
- Parking brake lever must disengage before adjusting the equalizer.
Rotor Cleaning after Machining
- Disc brake rotors should be cleaned with soap and water after machining to prevent contamination.
Brake Hose Replacement Guidance
- When replacing front brake hoses, connect the hose to the caliper with a new copper sealing washer.
Surge Bleeding Method
- Surge bleeding can be utilized alongside manual or pressure bleeding to eliminate trapped air in the brake system.
Brake Rotor Refinishing
- Reason to refinish rotors can include heat checks, scoring, and thickness variation, while hard spots are typically not a reason.
New Brake Shoe Installation
- Adjustments on new brake shoes are done primarily to facilitate drum removal, not merely for installation.
Disc Rotor Replacement Decisions
- If only cast rotors are available, replacing both is advised regardless of minor issues on one rotor.
Wheel Bearing Problems and Brake Symptoms
- Wheel bearing issues can lead to pedal pulsation, brake pull, or grabbing.
Hydro-Boost System Components
- The accumulator in a Hydro-Boost system maintains power assist during hydraulic pressure loss.
Parking Brake Issues
- Caliper lever adjustments and brake shoe adjustments may be necessary if the parking brake fails to hold.
Integral Hub/Bearing Assembly Removal
- Removal of the steering knuckle is generally unnecessary when replacing an integral hub/bearing assembly.
Corrosion in Wheel Cylinder
- Corroded and scored wheel cylinder bores cannot be refinished, and oversize pistons/cups cannot compensate for excessive material removal.
Traction Control Systems Insights
- Some traction control approaches do not utilize brakes, discrepancies in ABS functioning can affect traction control effectiveness.
Brake Drum Machining Practices
- Proper machining practices require a low feed rate at specified depth cuts for rough work on brake drums.
Vacuum Checks in Brake Systems
- Vacuum should be present on the booster side in double-action systems, indicating proper function.
Brake Warning Systems Schematic
- Various factors, including faulty switches or leaks, can lead to brake warning light illumination, while specific wiring opens don’t.
Brake Fluid Condition Checks
- The most accurate brake fluid condition sample should be taken from the brake caliper.
Gravity Bleeding Limitations
- Gravity bleeding is quick but cannot be used for silicone brake fluids.
Excessive Lateral Runout Correction
- The most budget-friendly method for correcting excessive lateral runout is indexing rather than machining or replacing.
New Disc Brake Pad Procedures
- New pads must go through a burnishing process during road tests to ensure proper mating with the rotor surface.
Automatic Parking Brake Release Issues
- A parking brake that remains applied can be due to various electrical malfunctions or a vacuum leak, but not due to cable seizing.
Electronic Stability Control (ESC) Functions
- ESC integrates multiple sensor readings to balance intended versus actual vehicle path, ensuring stability.
Intermittent ABS Activation Diagnosis
- Occasional ABS activation without error codes can be caused by a series of mechanical issues like damaged components.
Brake Fluid Aging Effects
- Aging brake fluid tends to corrode ABS valves, while it noticeably affects copper lines, emphasizing the importance of fluid maintenance.
Wheel Cylinder Repair Methodology
- The correct procedure for wheel cylinder repair involves sequential cleaning and honing before reassembly.
Wheel Speed Sensor Diagnosis
- An erratic waveform in the wheel speed sensor generally indicates a damaged tone ring rather than just a gap issue.
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Description
Test your knowledge and readiness for the ASE A5 certification with this collection of practice flashcards. Each card presents a question related to automotive brake systems, including potential issues and corresponding solutions. Perfect for students and professionals preparing for the ASE A5 exam.
