Deck 5: Hydraulic Lines, Valves, and Switches

Question 1

Technician A says the  brake pedal position sensor is a potentiometer. Technician B says it can inform the BCM that the brake lamps need to be illuminated. Who is correct?

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

Answer 1

C

Question 2

Technician A says water trapped around  brake tubes, fittings, and mounting clips can rust and corrode steel tubing. Technician B says mounting clips can trap salt water and hide severe corrosion. Who is correct?

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

Answer 2

C

Question 3

Technician A says double-wall tubing is made in two ways: seamless and multiple ply. Technician B says that each must meet the specifications of SAE Standard J1047 as amended. Who is correct?

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

Answer 3

C

Question 4

Brake tubing is being discussed. Technician A says tubing vibration could cause metal fatigue. Technician B says copper tubing may be used as brake tubing. Who is correct?

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

Question 5

Technician A says all brake hoses are DOT approved. Technician B says some brake hoses are not DOT approved and you must check with your supervisor or parts vendor as to the hose warranty or desirability of using unapproved hose. Who is correct?

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

Question 6

Technician A says the assembly shown in the following figure is used to secure a flexible brake hose and rigid steel tubing. Technician B says the clip in the following figure keeps the connection from leaking. Who is correct? ​

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

Question 7

A brake hose must withstand ______ psi of pressure for 2 minutes without rupturing.

A)1,000
B)3,000
C)2,000
D)4,000

Question 8

Proportioning valves are being discussed. Technician A says inertia and momentum cause weight to shift forward during braking. Technician B says the weight shift is proportional to the braking force and rate of deceleration. Who is correct?

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

Question 9

Technician A says the hydraulic tubing used in the brake system is double-wall, welded-steel tube. Technician B says brake tubing is coated with a tin- or lead-based alloy to reduce vibration. Who is correct?

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

Question 10

Technician A says the pressure differential valve is a hydraulically operated switch that controls the brake failure warning lamp on the instrument panel. Technician B says the pressure differential valve came into use after the advent of ABS braking. Who is correct?

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

Question 11

When would it be desirable to use a lever- or gear-type bender instead of a bending coil spring?

A)On small-diameter tubing
B)On large-diameter tubing
C)Where a precise bend is needed
D)Both B and C

Question 12

Brake warning lights are being discussed. Technician A says a pressure differential in the brake system will switch on the light. Technician B says a typical switch for this light is tripped by vacuum. Who is correct?

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

Question 13

All of the following may cause the red brake warning light to illuminate EXCEPT:

A)pressure differential between hydraulic channels.
B)low brake fluid.
C)the ignition key in the ON position.
D)worn brake pads.

Question 14

Technician A says the metering valve keeps the front disc brakes from operating until the rear drum brakes have started to work. Technician B says the proportioning valve reduces the hydraulic pressure at the rear drum brakes when high pressure is required at the front disc brakes. Who is correct?

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

Question 15

Brake hose diameter is usually specified as the ____ diameter of the hose.

A)outside
B)inside
C)fitting
D)bend

Question 16

Technician A says brake tubing should be double flared or ISO flared. Technician B says an ISO tubing seat must be used with the ISO flare. Who is correct?

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

Question 17

____________ are the flexible links between the wheels or axles and the body frame.

A)Helper springs
B)Brake hoses
C)Drums
D)Hydraulic lines

Question 18

Technician A says metering valves function only during the initial stages of braking. Technician B says the proportioning valve restricts fluid to the rear wheels, thereby lowering the pressure to help prevent wheel  lockup in the rear. Who is correct?

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

Question 19

Multiple-ply tubing is formed as two ___________ tubes.

A)double-wall
B)single-wall
C)aluminum
D)Both A and B

Question 20

Technician A says special tools are required to flare tubing, and the tools for SAE and ISO flares are different . Technician B says a typical flaring tool consists of a flaring bar and a flaring clamp. Who is correct?

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

Question 21

Technician A says stoplight switches may be single-function or multifunction units. Technician B says the stop lamp switch is a normally open, momentary contact switch. Who is correct?

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

Question 22

Technician A says a brake hose usually has a fitting that mates to a flare nut on the line. Technician B says a single flare is typical for a brake line. Who is correct?

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

Question 23

All of the following are types of tubing fittings EXCEPT:

A)swivel.
B)floating.
C)fixed.
D)banjo.

Question 24

Technician A says all pressure differential valves must be manually recentered after bleeding. Technician B says a recentering spring is used on some pressure differential valves. Who is correct?

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

Question 25

Which of the following types of wire repair is best?

A)Wrapping damaged insulation with tape.
B)Using a solderless crimp connector.
C)Using a tap connector.
D)Soldering and shrink wrap.

Question 26

Discuss how brake tubing is manufactured.

Question 27

Technician A says most late model vehicles are equipped with computer-controlled brake and stoplamp circuits. Technician B says on some vehicles the turn signal and brake lamp switches are inputs to a module that delivers power to the respective bulbs. Who is correct?

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

Question 28

Electrical wiring repair is being discussed. Technician A says wire size is specified in either the American Wire Gauge (AWG)system or in a metric cross-sectional area. Technician B says the higher the number in AWG the higher the conductor. Who is correct?

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

Question 29

Explain the difference between a brake hose and a brake line and where they are found on a vehicle.

Question 30

What does it mean if only the amber ABS warning light is lit? What does it mean when both the read and amber warning lights are lit? What does it mean if only the red warning light is lit?

Question 31

Technician A says ISO flare fittings may have a different pitch thread depending on the make and model of the vehicle. Technician B says ISO flares tend to seal better while using more torque on the threaded nut. Who is correct?

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

Question 32

Technician A says that dynamic rear proportioning (DRP)is provided by the Brake Pedal Position (BPP)sensor. Technician B says that dynamic rear proportioning (DRP)is provided by the antilock brake system (ABS). Who is correct?

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

Question 33

Explain why a tap splice connector is not considered a permanent connection.

Question 34

How is the brake hose mounted to the stationary brake tubing and frame?

Question 35

What are unions and tee fittings used for?

Question 36

Brake lamp bulb replacement is being discussed. Technician A says some taillamp and stop lamp bulbs can be replaced without removing the lens assembly. Technician B says on some vehicles, the complete taillamp lens assembly must be removed for access to the bulbs. Who is correct?

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

Question 37

Explain why a metering valve is needed.

Question 38

Explain the parking brake switch test.

Question 39

Technician A says the best hydraulic connection between the vehicle frame and the wheel assembly is a soft metal tubing. Technician B says a defect in a flexible brake hose may prevent that brake from releasing. Who is correct?

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

Question 40

Technician A says double-wall steel brake tubing is the only type of tubing approved for brake lines. Technician B says to use 100 percent copper tubing as a replacement. Who is correct?

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

Question 41

Explain the purpose of a proportioning valve.

Question 42

Fluid can return through the metering valve when the brakes are released.

Question 43

Brake fittings are made with both SAE and ISO metric threads.

Question 44

Brake pipes are used where the lines have to flex.

Question 45

The proportioning valve is located in the hydraulic line to the rear brakes.

Question 46

The SAE fitting is a metric design, originally used on imported vehicles but now common on domestic brake systems.

Question 47

On a vehicle with four-wheel disc brakes, the application times for the brakes at all wheels are unequal.

Question 48

Different types of flares are not interchangeable.

Question 49

Explain the operation of computer controlled turn and stoplamps.

Question 50

Tubing installed on a car when it is manufactured is ____________________ to fit properly into the brake system.

Question 51

On an FWD car, 60 percent of the braking is done by the front brakes, so it is desirable to apply them as quickly as possible .

Question 52

Copper fuel line fittings should never be used as brake line fittings.

Question 53

Fittings is a term applied to all plumbing connections used on a vehicle.

Question 54

When the brakes are first applied and under light braking, the proportioning valve does nothing.

Question 55

The fluid level switch has replaced the pressure differential valve warning switch on most vehicles .

Question 56

Brake lines in a typical car are steel tubes or pipes.

Question 57

Explain how the metering valve operation can be checked with a pressure bleeder.

Question 58

The most common diameters for steel tubing in the inch system are ³ / ₁₆ -inch,  ¹ / ₄ -inch, and  ⁶ / ₁₆ -inch range.

Question 59

All SAE fittings used in brake systems have a 45-degree taper on the male nut and on the inside of the flare.

Question 60

Straight compressed washer fittings are usually found on the ends of brake hoses that attach to calipers or wheel cylinders.

Question 61

The formed end of steel tubing is called a(n)____________________.

Question 62

Brake tubing clips are important because they keep the tubes from ____________________.

Question 63

Brake hoses are ____________________ links between the wheels or axles and the frame or body.

Question 64

The ends of brake tubing are formed into either an inverted double flare or an ISO flare with a fitted ____________________.