Deck 95: Hydraulic Valves and Switches

Question 1

Technician A says a pull to the right during braking could be caused by a defective metering valve.Technician B says a pull to the left could be caused by a defective proportioning valve. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Answer 1

Neither technician A nor B

Question 2

The rear brakes lock up during a regular brake application. Technician A says the metering valve could be the cause. Technician B says that stuck front disc brake calipers could be the cause. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Answer 2

Technician B only

Question 3

The rear wheels lock up during hard braking. Technician A says that a defective metering valve could be the cause. Technician B says that a defective proportioning valve could be the cause. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Answer 3

Technician B only

Question 4

A combination valve could include ________.

A)Proportioning and pressure-differential valves
B)Proportioning, metering, and pressure-differential valves
C)Metering and proportioning valves
D)Any of the above depending on the make and model of the vehicle

Question 5

A residual check valve is used to ________.

A)Prevent rear wheel lockup during hard braking
B)Speed brake release to reduce brake wear
C)Prevent front wheel lockup during hard braking
D)Maintain a slight pressure on the hydraulic system

Question 6

Technician a says that the red brake warning light can be turned on if a difference in pressure is detected by the pressure differential switch. Technician B says that the red brake warning light can be turned on if the brake fluid level sensor detected low brake fluid level. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 7

Which type of vehicles most often do not use metering valves?

A)Rear-wheel drive
B)All-wheel drive
C)Four-wheel drive
D)Front-wheel drive

Question 8

Technician A says that some proportioning valves are one part and used to control both rear brakes.Technician B says that some proportioning valves are two parts; one for each rear wheel. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 9

The button on the ________ valve should be held when pressure bleeding the brakes.

A)Metering
B)Pressure-differential
C)Residual check
D)Proportioning

Question 10

A typical brake light switch is electrically ________.

A)Normally closed
B)Normally open

Question 11

Two technicians are discussing the metering valve in a front-disc, rear-drum braking system. Technician A says that the metering valve delays application of the front brakes. Technician B says that the metering valve delays the application of the rear brakes. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 12

When the brakes are applied in a panic situation, the rear brakes have a tendency to skid. The most likely cause is ________.

A)Quick take-up valve in the master cylinder
B)Compensation port clogged in the master cylinder
C)Metering valve is faulty
D)Proportioning valve is faulty

Question 13

A vehicle tends to lock up the front wheels when being driven on slippery road surfaces. Technician A says that the metering valve may be defective. Technician B says that the proportioning valve may be defective. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 14

The residual check valve maintains between 20 and 60 psi in the brake lines.

Question 15

Residual check valves may be located in the combination valve.

Question 16

The metering valve delays front brake action.

Question 17

Dual braking systems sometimes use a fluid level switch in place of a pressure differential switch.

Question 18

One type of fluid level switch uses a magnet and reed switch.

Question 19

The metering valve blocks fluid flow to the front brakes when pressure reaches 75 to 125 psi.

Question 20

Residual check valves ________.

A)Are used only on antilock braking systems
B)Do NOT keep air out of the brake lines
C)May be located under the tubing seat
D)Are required on systems with cup expanders in their wheel cylinders

Question 21

When the brakes are applied lightly at low speeds on slippery pavement, which type of valve keeps the front brakes from locking?

A)Metering valve
B)Proportioning valve
C)Residual pressure check valve
D)Purge valve

Question 22

The pressure at which a proportioning valve begins to limit pressure to the rear brakes is called the:

A)Split point
B)Slope
C)Limit point
D)Pressure limit

Question 23

The ratio of front to rear hydraulic system pressure supplied to the rear brakes by the proportioning valve is called ________.

A)Split point
B)Pressure limit
C)Slope
D)Limit point

Question 24

Technician A says that the height-sensing proportioning valve changes its split point by means of a rotating cam. Technician B says that levers are used in conjunction with the height-sensing proportioning valve. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 25

A visual inspection of the metering valve includes ________.

A)Inspection for excessive leakage
B)Verifying that the valve stem moves when the brakes are applied
C)Both A and B
D)Neither A nor B

Question 26

On a late model vehicle, the brake light switch sends a signal to the ________.

A)Body control module (BCM)
B)Instrument cluster
C)Either A or B
D)Neither A nor B

Question 27

Technician A says installation of aftermarket air shocks may cause height-sensitive proportioning valves to function improperly. Technician B says vehicles equipped with ABS systems using electronic brake proportioning (EBP) do not need proportioning valves. Which technician is correct?

A)Technician A only
B)Technician B only
C)Both technicians A and B
D)Neither technician A nor B

Question 28

Identify the valve shown (arrow).

A)Proportioning valve
B)Take-up valve
C)Residual check valve
D)Metering valve

Question 29

Identify the valve shown.

A)Metering valve
B)Residual check valve
C)Take-up valve
D)Proportioning valve

Question 30

Identify the valve shown.

A)Metering valve
B)Proportioning valve
C)Take-up valve
D)Residual check valve