Hydraulic Brake System Diagnosis and Service 190103c

Question 1

1. List two (2) Alberta Government acts, regulations or programs relating to vehicle
   safety.

Answer 1

a) Motor Transport Act
b) Commercial Vehicle Inspection Program
c) Commercial Vehicle Standards Alliance

Question 2

2. A vehicle on which you did a brake job has been involved in an injury accident. The
   owner can sue your employer and you.
   a) true
   b) false

Answer 2

a) true

Question 3

3. Asbestos is a health hazard. What can you do to protect yourself from this material?

Answer 3

a) Wear a breathing mask, as asbestos affects your lungs.
b) Wash parts with water or a brake cleaning solution.
c) Do not use compressed air to clean brake parts.

Question 4

4. Injuries can occur around heavy equipment and components. How can you protect
   yourself from injury?

Answer 4

a) Use hoists, jacks, lifting and moving equipment.
b) Have your co-workers assist when lifting and moving large parts.
c) Lift properly - use your legs.

Question 5

5. Flexible brake lines must not bulge or expand outward under high pressure
   applications.
   a) true
   b) false

Answer 5

A. True

Question 6

6. What is meant by the term maximum diameter as it relates to brake drums?

Answer 6

This is the greatest diameter recommended by the vehicle manufacturer (discard
diameter).

Question 7

7. What is meant by the term minimum thickness as it relates to brake rotors?

Answer 7

This is the thinnest the rotor can be as recommended by the manufacturer (discard
thickness).

Question 8

8. What or who are your sources of information regarding a customer’s vehicle brake
   problem(s)?

Answer 8

a) the vehicle operator
b) a service advisor
c) a work order
d) your own observations on a walk-around
e) a road test

Question 9

9. What two (2) methods can you use to detect equipment problems once a customer
   brings a vehicle to your shop?

Answer 9

a) vehicle walk around; look and touch

b) vehicle road tests, listen and feel

Question 10

10. What safety precautions should you observe before working on or under a vehicle?

Answer 10

a) Use recommended jacking points and an adequate capacity jack or hoist to lift
the vehicle.
b) Place on correct capacity axle stands.
c) Use proper lifting and moving equipment.

Question 11

11. Why would you only work on one brake assembly at a time on the same axle?

Answer 11

The assembled side is a reference for checking your work.

Question 12

12. Drum diameter, out-of-round and taper are three checks used to determine brake
    drum condition?

Answer 12

. a) true

Question 13

13. A brake drum that has a crack in it can be welded and returned to service.
    a) true
    b) false

Answer 13

b) false; Never weld a brake drum.

Question 14

14. A new brake drum and a used brake drum can be used on the same axle? Explain
    your answer.
    a) true
    b) false

Answer 14

Not normally unless the worn drum is within 0.010” (0.254mm) of the new drum
diameter.

Question 15

15. After machining, brake drums should be sanded with a 240 grit sandpaper. Why is
    this done?

Answer 15

This removes cutting grooves and creates a non-directional finish so the shoes do not
move sideways during application.

Question 16

16. If brake return springs are discolored and slightly bent, they can be safely
    straightened and returned to service.
    a) true
    b) false

Answer 16

b) false; Springs will fail in service or not provide proper tension.

Question 17

17. Grease or oil on brake linings or on drum or disc friction surfaces can be wiped off
    with Varsol and the parts will remain serviceable.
    a) true
    b) false

Answer 17

b) false; Varsol itself is oil based and will contaminate linings and friction
surfaces.

Question 18

18. During inspection, brake rotors are measured for:
    a) parallelism.
    b) lateral run out.
    c) rotor thickness.
    d) maximum diameter.
    e) all but d are correct

Answer 18

e) all but d are correct.

Question 19

19. What two methods are used to mount brake linings to brake shoes and brake pads?
    a) Bolts and Machine screws
    b) Bonding and Riveting
    c) Brazing and Welding
    d) High temperature and High pressure

Answer 19

b) bonding and riveting.

Question 20

20. Prior to pad removal and caliper disassembly, what precaution should be taken before
    pushing the pistons back into the caliper bores?

Answer 20

Remove about ½ the volume of brake fluid from the disc brake reservoir in the
master cylinder.

Question 21

21. When the caliper is unfastened from the anchor plate what safety precaution should
    be followed?

Answer 21

Hang the caliper from a stable point to prevent damage to the flex hose

Question 22

22. Rotor thickness should be the same from one side of the vehicle to the other on the
    same axle.
    a) true
    b) false

Answer 22

A. True

Question 23

23. Wheel bearings which are adjusted too loosely can have a negative effect on braking.
    a) true
    b) false

Answer 23

A. True

Question 24

24. Explain why wear indicators are used with disc brake pads?

Answer 24

Wear indicators provide an audible and/or visual warning ofreduced pad lining
thickness. This helps prevent rotor damage.

Question 25

25. The diaphragm seal between the filler cover and the master cylinder body prevents
    outside air from contacting the brake fluid. This prevents water vapor from
    contaminating the brake fluid.
    a) true
    b) false

Answer 25

A. True

Question 26

26. Aluminum master cylinders and aluminum wheel cylinders should not be honed as
    part of a repair process.
    a) true
    b) false

Answer 26

A. True

Question 27

27. What fluid is suitable for use when honing a brake cylinder?

Answer 27

Brake fluid

Question 28

28. Grease or oil on rubber brake parts poses no problem for the parts or the system.
    a) true
    b) false

Answer 28

b) false; Grease and oil can cause rubber parts to swell.