brake repairer bus Interview Questions and Answers

0
100 Brake Repairer Interview Questions and Answers

  1. What are the main components of a bus brake system?

    • Answer: A typical bus brake system includes brake calipers or drum brakes, brake pads or shoes, master cylinder, wheel cylinders, brake lines, air compressor (for air brakes), air tanks, and various valves and control units.

  2. Explain the difference between disc and drum brakes.

    • Answer: Disc brakes use calipers to squeeze pads against a rotating disc, while drum brakes use shoes that expand against a rotating drum. Disc brakes generally offer better heat dissipation and stopping power, while drum brakes tend to be more durable and less expensive.

  3. How do air brakes work?

    • Answer: Air brakes use compressed air to actuate the brakes. An air compressor builds up pressure in air tanks. When the brakes are applied, this air pressure is released to actuate brake chambers or diaphragms, which in turn apply the brakes.

  4. Describe the process of bleeding brakes.

    • Answer: Bleeding brakes involves removing air bubbles from the brake lines. This is done by opening bleeder valves at each wheel while an assistant pumps the brake pedal (or uses a pressure bleeder) to force fluid through the lines and expel the air.

  5. What tools and equipment are essential for brake repair?

    • Answer: Essential tools include wrenches, sockets, screwdrivers, brake caliper compressors, bleeder wrenches, brake fluid containers, a pressure bleeder (optional but recommended), jack stands, wheel chocks, and safety glasses.

  6. How do you inspect brake pads for wear?

    • Answer: Inspect brake pads for remaining pad material thickness, checking against manufacturer's specifications or using a wear indicator. Look for cracks, scoring, or glazing on the pad surfaces.

  7. What are the signs of a faulty master cylinder?

    • Answer: Signs include a spongy or soft brake pedal, low brake fluid level despite no visible leaks, brake pedal going all the way to the floor, and brake failure.

  8. How do you check for brake fluid leaks?

    • Answer: Visually inspect brake lines, calipers, wheel cylinders, and master cylinder for any signs of fluid leakage. Check the ground beneath the vehicle for fluid stains.

  9. Explain the importance of proper brake fluid.

    • Answer: Brake fluid must be compatible with the system's components and maintain its properties under high temperatures and pressures. Using the wrong fluid can damage seals and components.

  10. What safety precautions should be taken when repairing brakes?

    • Answer: Always use jack stands to support the vehicle, never rely solely on a jack. Wear safety glasses and gloves. Ensure the vehicle is parked on a level surface with the parking brake engaged. Be aware of potential hazards from hot brake components.