Brake System Diagnosis and Service

Question 1

Flushing the brake hydraulic system periodically is necessary because:

a) brake fluid oxidizes over time and must be replaced
b) brake fluid is hygroscopic and will become moisture contaminated over time
c) old brake fluid attacks the rubber components and must be replaced with fresh fluid in order to stop the deterioration of the seals
d) none of the above

Answer 1

b) brake fluid is hygroscopic and will become moisture contaminated over time

Question 2

A brake system requires bleeding any time that:

a) hydraulic components are removed or disconnected
b) a leak allows air to enter the hydraulic system
c) extreme heat has caused the fluid to boil in the lines
d) any of the above

Answer 2

d) any of the above

Question 3

When bleeding brakes using the gravity bleed method:

a) position a catch bottle at each bleed screw that you open
b) stroke the pedal slowly to avoid breaking up the air bubbles
c) fill the pressure tank with fresh, clean fluid
d) place a block of wood under the brake pedal

Answer 3

a) position a catch bottle at each bleed screw that is opened

Question 4

When flushing or bleeding a vehicle equipped with ABS, you should:

a) always use DOT 5 fluid
b) never use DOT 3 fluid
c) consult the service manual for the proper method of bleeding all air from the system
d) filter the fluid removed from the system and reuse it

Answer 4

c) consult the service manual for the proper method of bleeding all air from the system

Question 5

Brake system diagnosis should begin with a road test. before taking the vehicle on any public roads, you should check the:

a) fluid in the master cylinder for level and contamination
b) brake pedal for travel and feel
c) ability of the brakes to stop the vehicle by making some low speed stops
d) all of the above

Answer 5

d) all of the above

Question 6

When diagnosing brake vibration and shudder complaints, it may be necessary to:

a) disable one half of the brake system by blocking the line to that side
b) warm the brakes up by making panic stops until the brakes begin to fade
c) make several normal to hard stops to heat the brakes to normal operating temperature
d) inflate the tires to the maximum rating on the side wall to prevent the tires from masking the problem

Answer 6

c) make several normal to hard stops to heat the brakes to normal operating temperature

Question 7

During normal non ABS stop the brake pedal pulsates/vibrates. Which of the following is most likely at fault?

a) brake rotors will excessive run-out
b) a primary circuit failure in the master cylinder
c) brake rotors with excessive thickness variation
d) a seized brake caliper

Answer 7

c) brake rotors with excessive thickness variation

Question 8

If a vehicle pulls to the left while braking, it may be because of:

a) a seized brake caliper
b) incorrectly machined brake rotors
c) a leaking axle seal
d) all of the above

Answer 8

d) all of the above

Question 9

You can repair brake fluid that has a low boiling point by:

a) removing some old fluid and installing new fluid
b) installing methol hydrate to absorb the moisture
c) topping up the fluid with DOT 5
d) flushing the brake fluid with new fluid

Answer 9

d) flushing the brake fluid with new fluid

Question 10

Pedal fade is most often caused by:

a) primary cup/seal failure
b) overheated friction material
c) oil contaminated linings
d) none of the above

Answer 10

a) primary cup/seal failure