Question 1

What is the purpose of the primary piston extension screw?

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Question 2

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

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Question 3

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?

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Question 4

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

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Question 5

What is the advantage of a translucent master cylinder reservoir?

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Question 6

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

Accepted Answer

Internal rubber parts in a master cylinder can wear with age and compromise its sealing ability, causing leaks. Clogged ports are more likely to cause restrictions in the brake fluid flow, leading to a loss of pressure or a spongy brake pedal feel. However, it is possible that a leaky master cylinder can have clogged ports as well.

Question 7

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?

Accepted Answer

Both technicians are correct. Air in the hydraulic system can cause a spongy or low brake pedal because air is compressible, unlike brake fluid. Improperly adjusted brake shoes can also lead to a low pedal, especially in drum brake systems, because the shoes have to travel further to contact the drum, which results in a lower pedal feel.

Question 8

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?

Accepted Answer

Both technicians are correct. A low fluid level in the reservoir can indicate worn brake pads as the pads wear, the calipers extend further and the brake fluid level in the reservoir drops. A small geyser of fluid from only one master cylinder reservoir chamber when the brake pedal is applied indicates abnormal cup wear, as fluid is being forced past the old, worn cups instead of being directed to the calipers.

Question 9

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?

Accepted Answer

A composite-type master cylinder is made of plastic or aluminum, not cast iron. Technician B is correct in stating that a composite master cylinder has a removable reservoir chamber.

Question 10

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

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Question 11

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

Accepted Answer

Bench bleeding is effective when done properly, but allowing the fluid to squirt out into the bench is not the recommended method. The preferred method is to use a bench bleeding kit to catch the fluid and recycle it back into the master cylinder. This reduces waste and keeps the work area clean. Choices A, C, and D are all true statements about bench bleeding.

Question 12

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?

Accepted Answer

Both technicians are correct. If the pushrod adjustment is too short, it can result in a loss of braking power and a low brake pedal. It is important to properly adjust the pushrod to ensure proper operation of the braking system.

Question 13

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?

Accepted Answer

Flushing the brakes refers to the complete replacement of all system brake fluid with new fluid, while bleeding the system is the removal of air from the system. Therefore, both Technician A and Technician B have their definitions reversed.

Question 14

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?

Accepted Answer

Both technicians are correct. If the fluid level is too high, it can cause hydraulic pressure to build up and keep the brakes applied. If the pushrod is misadjusted, it can cause the brake pads to remain in contact with the rotors, creating drag.

Question 15

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

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Question 16

Explain the operation of a suspended brake pedal mounting.

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Question 17

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?

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Question 18

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

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Question 19

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

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Question 20

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?

Accepted Answer

The primary piston in a dual-piston master cylinder is directly actuated by the pushrod, and it is the pressure created by the primary piston when it moves that causes the secondary piston to move. Technician A is incorrect because the pushrod does not directly move the secondary piston.

Quiz 4: Master Cylinder and Brake Fluid