ASE A5 Brakes Practice Test
16. After replacing the front brake calipers on a vehicle with a four-wheel disc brake system, the vehicle returns with brake drag. Which of the following is causing this condition?
- A. Glazed brake shoes.
- B. Brake shoe adjustment.
- C. Glazed brake pads.
- D. A twisted brake hose.
Answer A is wrong. The vehicle has a four-wheel disc brake system; brake shoes are installed in drum brakes. Glazed brake shoes result from the excessive heat caused by a dragging brake unit. Glazing is more of a problem with the shoes because brake pads are better ventilated.
Answer B is wrong. The vehicle has a four-wheel disc brake system; adjust the brake shoes on drum brake systems.
Answer C is wrong. Glazed brake pads result from the excessive heat caused by a dragging brake unit. Glazed shoes or pads cause brake fade, resulting in friction loss and reduced braking performance.
Answer D is correct. A kinked brake line or twisted brake hose results in brake drag. Never let a brake caliper hang on the flexible brake hose, and be careful not to twist the hose when reinstalling the caliper.
17. A lateral runout test is performed on all four rotors. Which of the following is correct about this test?
- A. This test checks for rotor thickness.
- B. This test checks for rotor parallelism.
- C. Use a dial indicator.
- D. Use an outside micrometer.
Answer A is wrong. Measure a rotor for parallelism or different thicknesses around the rotor's surface with an outside micrometer.
Answer B is wrong. Check for parallelism at four to eight spots around the rotor to find the thinnest spot.
Answer C is correct. Use a dial indicator to check a rotor for lateral runout or side-to-side movement. View an illustration explaining lateral runout by clicking the Read more... button.
Answer D is wrong. Parallelism is diagnosed by measuring several spots on the surface of the rotor with an outside micrometer.
The reading on the metric micrometer above indicates:
- A. 13.0 mm
- B. 13.5 mm
- C. 14.0 mm
- D. 14.5 mm
Answer A is wrong. The answer is 14.5 mm. Metric micrometers are similar to standard micrometers.
Answer B is wrong. Whole number increments are on one side of the sleeve, and half-millimeter increments are on the other.
Answer C is wrong. The thimble of the micrometer has 50 increments of .01 millimeters.
Answer D is correct. The answer is 14.5 mm. It is important to remember that increments are on both sides of the sleeve.
19. Which brake line is best suited for automotive brake line replacement?
- A. Double-walled steel tubing.
- B. Double-walled tin tubing.
- C. Single-walled seamless copper.
- D. Single-walled welded copper.
Answer A is correct. Automakers typically use double-walled steel tubing as their standard OEM brake line.
Answer B is wrong. Brake lines are replaced with OEM, aftermarket galvanized steel, or fabricated metal tubing and fittings.
Answer C is wrong. They use double-walled steel tubing with either ISO or double-flared ends.
Answer D is wrong. Some fabricators use more flexible nickel-copper alloy, never 100% copper tubing found in hardware stores.
20. Technician A says a three-function combination valve contains the proportioning valve. Technician B says a three-function combination valve contains the metering valve. Who is correct?
- A. Technician A
- B. Technician B
- C. Both A and B
- D. Neither A or B
Answer A is wrong. The proportioning valve is part of the combination valve.
Answer B is wrong. The metering valve is part of the combination valve.
Answer C is correct. Both technicians are correct.
Answer D is wrong. The brake failure light switch is also part of the combination valve.