Questions and Answers
Study Notes
Brake Systems Overview
- Amber ABS fault light indicates an issue; permanent magnet sensor systems work well below 5 mph.
- Uneven brake pad wear can occur due to various factors; air in the system is the least likely cause.
Warning Lights
- A red brake warning light may indicate issues other than a loose wheel speed sensor plug.
- A malfunctioning brake light may require inspection of the switch and wiring connectors.
Brake Pad and Rotors
- Burnishing new brake pads involves light applications of the brake pedal and cooldowns between stops; not high-speed stops.
- Uneven pad wear on disc brake systems may result from faulty caliper slide pins.
Technician Knowledge
- Neither technician's statements regarding ABS hydraulic modulators are completely correct.
- Electronic stability control requires speed sensors; its activation is indicated by a flashing telltale lamp.
Brake Components
- Integral ABS units do not include a vacuum booster; they integrate brake functions within one unit.
- Different types of brake fluids exist; DOT 5 is silicone-based.
System Failures
- Low brake pedal fade may indicate master cylinder cup seal issues; no external leaks may be present.
- Cracks or pitting on brake drums necessitate replacement or resurfacing.
Brake System Operation
- A three-function combination valve lacks a solenoid valve; it performs specific hydraulic controls.
- Metering valves may cause front brakes to skid upon initial application.
Electrical and Hydraulic Systems
- Brake light issues could stem from a short circuit; a stuck switch may also be implicated.
- An integral drum parking brake system includes components like a strut that can affect performance.
Special Brake Systems
- Electric parking brakes require special procedures before brake pad replacement due to their unique designs.
- Low brake pedal issues may result from either an incorrectly adjusted pedal or overheating brake fluid.
Brake Testing and Inspection
- Checking the inside diameter of brake drums requires measuring the largest point for accuracy.
- A low spongy brake pedal can stem from various systemic issues, excluding worn brake pads.
Maintenance Practices
- Rubber brake components should be lubricated with high-temperature silicon-based lubricants.
- A dropping brake pedal after starting the engine may indicate normal vacuum assistance behavior.
Common Issues
- A hard brake pedal can result from a malfunction in the brake booster, such as loss of vacuum.
- Over-tightening a wheel can lead to various complications in brake performance and wear.
Performance Evaluation
- Clicking noises from an ABS system upon startup are often normal and not indicative of a problem.
- Excessive vibrations during braking can signal issues such as rusty hub flanges or sticking calipers.
Troubleshooting
- Diagnosing pulling to one side while braking usually points to a seized caliper or line restrictions.
- Checking a brake booster diaphragm involves observing pedal pressure over time after engine shutdown.
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Description
Test your knowledge on brake systems with these ASE practice flashcards. This quiz focuses on ABS fault indicators and brake pad wear conditions. Enhance your understanding of brake mechanics and prepare for ASE certification.
