Deck 4: Master Cylinder and Brake Fluid

Question 1

Technician A says force on the brake pedal is transmitted directly to the wheels by linkage. Technician B says pedal force is transmitted by hydraulic pressure generated in the master cylinder. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Answer 1

B

Question 2

Brake fluid flushing is being discussed. Technician A says all manufacturers require fluid to be flushed at certain intervals. Technician B says to flush the system with clean water before adding fresh brake fluid. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Answer 2

D

Question 3

Pressure bleeding is being discussed. Technician A says to pump the brake pedal several times during the bleed procedure. Technician B says to hold the metering valve open during the bleed procedure. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Answer 3

B

Question 4

The quick take-up master cylinder is a type of ____ master cylinder designed for some front-wheel drive cars.

A)step bore
B)single piston
C)cast iron
D)none of the above

Question 5

Brake pedal pressure is increased by all of following EXCEPT:

A)the lever action of the brake pedal assembly.
B)the size of the master cylinder pistons.
C)power-assist units.
D)the size of the brake rotor.

Question 6

Technician A says brake pedal is needed to allow the master cylinder pistons to retract fully in their bore. Technician B says free play at the master cylinder is usually very slight. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 7

A step bore master cylinder has two different sizes of:

A)reservoir sections.
B)vent ports.
C)cylinder bores.
D)none of the above.

Question 8

Technician A says the brake pedal assembly is a lever that increases pedal force to the master cylinder. Technician B says the brake pedal lever is attached to a pushrod. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 9

Quick take-up master cylinders are being discussed. Technician A says this type of master cylinder keeps the pads away from the rotor. Technician B says they help increase fuel mileage. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 10

The fluid flow shown in the illustration occurs when the brakes are:

A)being applied.
B)being released.
C)at rest (completely off).
D)none of the above.

Question 11

Technician A says DOT 3 and DOT 4 brake fluids have a higher boiling point than DOT 5. Technician B says DOT 4 brake fluid has a higher wet boiling point than DOT 5. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 12

Technician A says a dual master cylinder uses two matching primary pistons. Technician B says the pistons can create separate pressures in some instances. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 13

Some Toyota master cylinders do not use replenishing or compensating ports. Instead they use a valve that is machined into the master cylinder:

A)reservoir.
B)pistons.
C)cylinder bore.
D)all of the above.

Question 14

Filling a master cylinder is being discussed. Technician A says to fill the master cylinder to the fill mark on the reservoir. Technician B says some master cylinders may have markings on the inside of the reservoir. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 15

Dual master cylinders are being discussed. Technician A says this system is so named because of the two master cylinders. Technician B says dual master cylinders use two separate bores. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 16

Technician A says one piston of a dual master cylinder may supply pressure to one front wheel and one rear wheel. Technician B says a piston may supply pressure only to the brakes on one axle. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 17

DOT 5 brake fluids may be mixed with or used to replace DOT ____ brake fluids.

A)5.1
B)3/4
C)5.1 long-life
D)none of the above

Question 18

Technician A says the master cylinder reservoir may be a one-piece unit with the cylinder body. Technician B says the composite master cylinder has a separate aluminum body and a molded nylon or plastic reservoir. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 19

Technician A says the brake warning light will remain on with the ignition switch in the RUN position if the parking brake is partially applied. Technician B says a low brake fluid level in the master cylinder may cause the brake warning light to come on. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 20

Technician A says air in the hydraulic system causes most low-pedal problems. Technician B says low pedal can also be caused by a leak in the hydraulic system and incorrect pushrod length adjustment. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 21

What is the purpose of the primary piston extension screw?

Question 22

Explain the purpose of the step bore master cylinder quick-fill valve.

Question 23

Technician A says a small ripple in only one section of the reservoir as the brakes are being applied is normal. Technician B says a small geyser in the reservoirs as the brakes are being applied is normal. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 24

Explain what is meant by a split design master cylinder reservoir.

Question 25

What is the advantage of a translucent master cylinder reservoir?

Question 26

Technician A says internal rubber parts wear with age. Technician B says internal master cylinder leaks are caused by clogged ports. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 27

Technician A says a low pedal may be caused by air in the hydraulic system. Technician B says a low pedal may be caused by improperly adjusted shoes. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 28

Technician A says a low fluid level in the reservoir may indicate worn brake pads. Technician B says a small geyser of brake fluid from only one master cylinder reservoir chamber when the brake pedal is applied may indicate abnormal cup wear. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 29

Technician A says a composite-type master cylinder is made of cast iron. Technician B says a composite master cylinder has a removable reservoir chamber. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 30

Name four vehicle defects that affect braking but are not part of the brake system.

Question 31

All of the following statements about bench bleeding master cylinders are true EXCEPT:

A)bench bleeding reduces the possibility of air getting into brake lines.
B)bench bleeding is most effective when the fluid is allowed to squirt out into the bench.
C)bench bleeding is particularly important with GM master cylinders that mount at an angle.
D)bench bleeding kits are available.

Question 32

Pushrod adjustment is being discussed. Technician A says a loss of braking power can result if the pushrod adjustment is too short. Technician B says a low brake pedal can result if the pushrod adjustment is too short. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 33

Technician A says that flushing the brakes is the removal of air from the system. Technician B says that bleeding the system is the complete replacement of all system brake fluid with new fluid. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 34

A vehicle has brakes that are dragging . Technician A says the fluid level may be too high. Technician B says the pushrod may be misadjusted. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 35

Explain when the master cylinder cups seal and when they allow fluid to pass.

Question 36

Explain the operation of a suspended brake pedal mounting.

Question 37

Technician A says if the fluid rises in one reservoir during brake application, then the cup on the opposite piston is leaking. Technician B says if the fluid rises in one section and drops in the other reservoir section, then one of the replenishing ports is clogged. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 38

What is the purpose of the ports located in the bottom of the master cylinder reservoir?

Question 39

What two parts of the brake system are connected by the pushrod?

Question 40

The normal operation of a dual-piston master cylinder is being discussed. Technician A says the secondary piston is moved by the pushrod. Technician B says the primary piston produces the pressure to move the secondary piston. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 41

What could cause the brake pedal to drop under steady pressure?

Question 42

The replenishing port is forward of the vent port.

Question 43

Some vehicles have a separate master cylinder fluid level warning light.

Question 44

The master cylinder reservoir provides a supply of ____________________ for brake operation.

Question 45

The master cylinder makes use of the principles of ____________________ to increase the driver's pedal effort.

Question 46

A low brake pedal could be caused by worn brake shoes or a defective brake shoe adjuster.

Question 47

The coil springs installed in the cylinder bore assist the piston in developing hydraulic pressure.

Question 48

The diagonally split hydraulic system is the oldest type of split braking system.

Question 49

What is the first diagnostic step you should take when diagnosing a brake pressure problem?

Question 50

Unequal fluid levels in the master cylinder reservoir chambers on front disc/rear drum brake vehicles are a sign of drum brake misadjustment.

Question 51

The internal parts of a composite master cylinder generally work the same way as those in a one-piece master cylinder.

Question 52

The dual outlet master cylinder provides a separate hydraulic system for the front and rear, or one front and one rear brake system.

Question 53

All master cylinder caps or covers are vented to prevent a(n)____________________ as the fluid level drops in the reservoir.

Question 54

The brake pedal assembly can be thought of as a(n)____________________ that multiplies the force applied to the pedal.

Question 55

A slight drop in master cylinder fluid level is a normal condition.

Question 56

The two-piece master cylinder body is usually made of ____________________.

Question 57

Hydraulic brake system leaks can be internal and external.