Questions and Answers
A vehicle pulls to the right after the brake pedal is released. This could be caused by:
Technician A says that brake drag can be caused by a seized star wheel adjuster. Technician B says that brake drag can be caused by worn drums. Who is correct?
Which of the following would typically provide an input to the ABS control module?
With the engine running, the brake pedal is low and soft. Brake fluid level is low in the primary reservoir. Which of the following would be the most likely cause?
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A brake line needs to be replaced. Technician A says a new line should be installed using a double flare or ISO. Technician B says a new section should be installed with compression fittings. Who is right?
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A set of tapered roller bearings are being serviced. Which of the following is true regarding the tightening process?
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Technician A says a defective brake switch can cause a faulty wheel speed signal. Technician B says this can be caused by rust. Who is correct?
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A vehicle equipped with a hydro-boost system has a low, soft pedal and poor brake performance. Which of these could be the cause?
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A customer complains of a loud growling or howling type noise while driving that gets louder as vehicle speed increases. Which of the following could be the cause?
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Which of the following is the correct way to handle brake fluid?
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All of the following could cause brake pedal pulsation EXCEPT:
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Which of the following would most likely cause a front brake caliper to leak?
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Which of the following would most likely cause the master cylinder reservoir to be low on fluid?
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A customer complains that their vehicle makes more or less noise based on the type of road surface they are driving on. What could be the cause?
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A hydro-boost equipped vehicle is complained of having a high, hard brake pedal. Which of the following tools could be used to help diagnose this?
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When talking about a low, firm brake pedal, which of these would be the most likely cause?
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The pressure differential valve will light the red brake warning light on the instrument panel when:
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A leak is found at the caliper piston. Which of the following would most likely result?
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An occasional rapid pedal pulsation on dry pavement, similar to the feel of an ABS stop, is being discussed. Which of the following could be the most likely cause?
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A customer complains that their vehicle pulls hard to the right when braking. The most likely cause would be:
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After a brake job and rotor replacement, a customer has a concern of a brake pulsation. Which of the following would be the most likely cause?
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A noise is heard from the rear of the vehicle. All of the following could be true EXCEPT:
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Study Notes
Brake System Issues
- A restricted brake hose on one side can cause the vehicle to pull in the opposite direction after releasing the brake pedal.
- Brake drag may arise from a seized star wheel adjuster or worn drums; both technicians may be citing valid causes if both factors are present.
- A brake light switch typically serves as an input to the ABS control module, indicating brake activity.
Brake Master Cylinder Problems
- A low, soft brake pedal with low fluid in the primary reservoir is likely due to a leaking master cylinder rather than other malfunctions.
- Replacement of a brake line should use double flare or ISO; compression fittings are not recommended in the industry.
Bearing and Adjustment Considerations
- Proper servicing of tapered roller bearings includes a final check with a dial indicator to ensure correct adjustment.
- Low brake pedal firmness can often be attributed to improperly adjusted brake shoes or leaking wheel cylinders.
Hydro-Boost and Brake Performance
- In hydro-boost systems, issues such as low pedal firmness could stem from air in the brake fluid or weak power steering pumps.
- A high, hard brake pedal in hydro-boost systems may require a power steering pressure tester for diagnosis.
Diagnostic Indicators
- Low brake fluid levels may originate from worn brake pads or a bypassing master cylinder.
- A pressure differential valve indicates a pressure imbalance by illuminating the red brake warning light on the dashboard.
Noise and Vibration Concerns
- Loud growling or howling sounds that intensify with speed often indicate worn wheel bearings.
- Brake pedal pulsation after a brake job may result from over-torqued lug nuts or improper installation practices.
Additional Factors
- Handle brake fluid with care: it should be stored in small, tightly sealed containers away from UV light to prevent degradation.
- Aggressive tire tread patterns can contribute to varied noise levels based on road surfaces.
Warning Signs and Effects
- A leak at the caliper piston commonly results in a soft brake pedal; various malfunctions can influence brake pedal responsiveness.
- Defective wheel speed sensors could cause erratic pedal pulsation akin to an ABS stop under certain conditions.
Vehicle Pulling Issues
- If a vehicle pulls during braking, it may result from stuck caliper slides on one side, affecting braking balance.
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Description
Prepare for the ASE A5 Brakes certification with this comprehensive practice test. It covers essential concepts and potential issues like brake hose restrictions and drag. Test your knowledge and readiness for the certification exam.
