MWHS Drum Brake System

2. Tech A says that riveted linings are more common on light-duty vehicles since they are less expensive to build and the rivets can fail under very high temperatures of heavy-duty use. Tech B says that bonded linings are used on heavier-duty or high-performance vehicles. Who is correct? a. Tech A b. Tech B c. Both Techs A and B d. Neither Tech A nor B

Tech B

24. Which type of brake lining is typically used on light-duty vehicles? a. Bonded b. Riveted c. Porcelain d. Wax

a. Bonded

1. If in doubt of a specialty springs location on a wheel brake assembly, the technician should: a. Check the other wheel brake unit to see where it is located b. Place it where he or she thinks it should go and road test the vehicle c. Leave it off of the wheel brake assembly d. None of the above

a. Check the other wheel brake unit to see where it is located

12. Tech A says that a grinding noise in drum brakes generally requires replacing the brake shoes and resurfacing or replacing the drums. Tech B says that a click noise in drum brakes requires replacing the brake shoes and resurfacing or replacing the drums. Who is correct? a. Tech A b. Tech B c. Both A and B d. Neither A nor B

a. Tech A

20. Tech A says that many brake drums usually start with 0.060? (1.524 mm) to work with when calculating if you can machine the brake drum. Tech B says that many brake drums usually start with 0.030? (0.762 mm) to work with when calculating if you can machine the brake drum. Who is correct? a. Tech A b. Tech B c. Both Techs A and B d. Neither Tech A nor B

a. Tech A

31. Technician A says that when reassembling a duo-servo brake, the backing plate pads should be lubricated. Technician B says that the star wheel assembly should be lubricated on the floating end. Who is correct? a. Technician A b. Technician B c. Both Technician A and Technician B d. Neither Technician A nor Technician B

a. Technician A

5. Technician A states that pre-adjusting the brake shoes and parking brake is a routine step in a drum brake job. Technician B states to start the pre-adjustment sequence by making sure the parking brake is fully applied. Who is correct? a. Technician A b. Technician B c. Both Technician A and Technician B d. Neither Technician A nor Technician B

a. Technician A

30. Start preadjusting the brake shoes and parking brake __________. a. by making sure the parking brake is fully released b. by making sure the parking brake is fully engaged c. by looking at the shoes to make sure the parking brake adjustment is not holding the brake d. by adjusting the service brakes

a. by making sure the parking brake is fully released

15. The anchor pin may hold all of the following EXCEPT the ________ on duo-servo-style brakes. a. hold-down pins b. shoe guide c. return springs d. self-adjuster cable

a. hold-down pins

10. Which type of drum is typically used on common passenger vehicles? a. Hub-style drum b. Hubless-style drum c. Both A and B d. None of the above

b. Hubless-style drum

7. Which type of drum is most common in passenger vehicles? a. Hub-style drum b. Hubless-style drum c. Rotorless-style drum d. Rotor-style drum

b. Hubless-style drum

18. Tech A says to use an air hose to clean the backing plate of dust and contamination. Tech B says to use a brake cleaning solution to clean the backing plate of dust and contamination. Who is correct? a. Tech A b. Tech B c. Both A and B d. Neither A nor B

b. Tech B

17. Technician A says that it is not necessary to clean any nicks, burrs, or debris from a brake drum surface before mounting the brake drum on a brake lathe. Technician B says that you should research the brake lathe manufacturer's procedure for properly refinishing a brake drum. Who is correct? a. Technician A b. Technician B c. Both Technician A and Technician B d. Neither Technician A nor Technician B

b. Technician B

8. Technician A states that brake drums should only be refinished when they are excessively grooved. Technician B states that after refinishing a brake drum, it should be remeasured to ensure that it is under the manufacturer's maximum diameter. Who is correct? a. Technician A b. Technician B c. Both Technician A and Technician B d. Neither Technician A nor Technician B

b. Technician B

16. Wheel cylinders are fitted with a ____________ to allow for bleeding of air and old brake fluid from the hydraulic brake system. a. cylinder bore b. bleeder screw c. piston seal d. tension monitor

b. bleeder screw

23. Drum brake return springs can be which type? a. Integrated coil spring b. U-shaped spring c. Both A and B d. None of the above

c. Both A and B

19. Technician A states that when replacing rear brake shoes, it is a good practice to disassemble only one side at a time, leaving the other side as a reference for when you reassemble the first side. Technician B states that it is good practice to use a digital camera to take a couple of reference pictures before disassembly. Who is correct? a. Technician A b. Technician B c. Both Technician A and Technician B d. Neither Technician A nor Technician B

c. Both Technician A and Technician B

14. ________________ do just what their name suggests; they hold the brake shoes against the backing plate. a. Specialty springs b. Return springs c. Hold-down springs d. None of the above

c. Hold-down springs

25. What does drum brake diagnosis start with? a. Having the proper tools ready b. Making a proper plan c. Understanding the customer's concern d. Taking out the time to make a plan

c. Understanding the customer's concern

9. When reinstalling a wheel cylinder on the backing plate, the brake line should be started by hand three or four turns to prevent _________ of the wheel cylinder. a. leakage b. bleeding c. cross-threading d. falling off

c. cross-threading

3. The _____________ gets its name from using the servo action in both the forward and the reverse direction. a. twin leading shoe drum brake system b. leading/trailing shoe drum brake system c. duo-servo drum brake system d. single-servo drum brake system

c. duo-servo drum brake system

11. The backing plate is made from stamped ______________ and is bolted to the steering or suspension components. a. iron b. aluminum c. steel d. plastic

c. steel

26. The backing plate has holes stamped in it for all of the following to pass through, EXCEPT _________. a. the wheel cylinder b. hold-down pins c. the pushrods d. the parking brake cable

c. the pushrods

29. All of the following can cause brake pedal pulsation, EXCEPT: a. Warped rotors. b. ABS operation. c. Rotor parallelism. d. Low brake fluid.

d. Low brake fluid.

27. Tech A says that brake spring pliers are used to remove and install hold-down springs. Tech B says that brake spring pliers are used to remove the parking brake cable from the backing plate. Who is correct? a. Tech A b. Tech B c. Both Techs A and B d. Neither Tech A nor B

d. Neither Tech A nor B

22. All of the following are typical parts found in a dual-acting wheel cylinder, EXCEPT: a. Piston seals. b. Pistons. c. Rubber boots. d. Retracting springs.

d. Retracting springs.

13. As the final step of you preadjustment, _____________________. a. make sure the parking brake is fully released b. make sure the parking brake is fully engaged c. adjust the service brakes d. adjust the parking brake

d. adjust the parking brake

28. Twin leading shoe drum brake systems use two ______ one near the top of the backing plate and one near the bottom. a. double-piston wheel cylinders b. single-piston wheel cylinders c. single-acting wheel cylinders d. both B and C ANS: d

d. both B and C

21. Due to the high temperatures and the large number of apply and return cycles that drum brake springs must endure, some manufacturers and shops recommend replacing the return spring and hardware every _________. a. oil change b. 1,000 miles c. 3 months d. brake job

d. brake job

4. To remove a brake drum, you may have to use a _____________ ball-peen hammer to hammer on the drum between the lug studs. a. small b. medium c. large d. either B or C

d. either B or C

6. The main components of the drum brake system include all of the following EXCEPT the _________. a. brake drum b. wheel cylinder c. brake shoes d. manual brake adjuster

d. manual brake adjuster

32. All of the following are categories of springs used in drum brakes EXCEPT _______________. a. return b. hold-down c. specialty d. stored-pressure

d. stored-pressure