Chapter 5

Question 1

Explain why 100% copper line should never be used as brake lines.

Answer 1

1. 100% copper line should never be used for brake lines because it cannot withstand the pressure or vibrations

Question 2

2. Describe an ISO flare.

Answer 2

2. An iso flare uses a bubble shaped end formed on the tubing to create a better seal with less torque

Question 3

3. Why are brake hoses marked with raised ribs or
   colored stripes?

Answer 3

3. Used to identify if twisting has occurred during installation that could lead to rupture

Question 4

4. Describe how an internal brake hose problem can
   cause brake pull and/or brake drag.

Answer 4

4. When a brake line wears to the point that a flap of rubber breaks off the wall and impedes flow either from the master cylinder to the wheel(pulling) or from the wheel back to the master cylinder(drag)

Question 5

5. Describe how a leak-free fitting is achieved with
   SAE flare fittings.

Answer 5

5. The male and female connectors are flared at 45° and 42° respectively, the 3° mismatch causes an interference fit that creates a leak-free seal

Question 6

6. Describe why a double flare is a better choice
   than a single flare.

Answer 6

6. The double flare has more sealing power and is more resistant to cracking than the single end flare

Question 7

Explain how the ABS system has taken the place
of many of the hydraulic control valves.

Answer 7

7. The ABS system uses hydraulic valves to prevent wheel lockup. Therefor the vehicles movements are predictable, and the old valves can be replaced by electronically controlled valves

Question 8

8. Describe the electronic brake pad wear indicator
   system used on some vehicles

Answer 8

8. The electronic brake pad wear indicator system uses a pellet attached to ground in the wear material. When the brake pads wear to a pre-determined point the circuit opens and the warning light comes on

Question 9

9. Explain the operation of the BPP sensor.

Answer 9

9. The BPP sensor tells the BCM to turn on the brake lamps as well as how fast and how hard the brakes were applied for traction control

Question 10

10. Describe an ISO fitting.

Answer 10

10. A type of tubing flare connection in which a bubble-shaped end is formed on the tubing; also called a bubble flare

Question 11

Brake lines or tubing consist of _______________tubes or pipes and flexible _______________ connected with fittings.

Answer 11

Steel/Hoses

Question 12

There are two common types of flares formed on the end of brake tubing, the _______________ flare and the _______________ flare.

Answer 12

double/iso

Question 13

SAE Standard J1047 requires that an 18-inch length of tubing must withstand an internal pres- sure of _______________ psi.

Answer 13

8000

Question 14

. An ISO flare is not _______________ on itself as is a double flare.

Answer 14

folded

Question 15

. _______________ fittings have become popular with both domestic and foreign vehicle manufacturers.

Answer 15

iso

Question 16

Straight ______________________________ fit- tings are usually found on the ends of brake hoses that attach to calipers or wheel cylinders.

Answer 16

compressed washer

Question 17

A ______________________________ is used to attach a hose or tube to a port on a cylinder or caliper at a close right angle

Answer 17

banjo

Question 18

Late-model vehicles use a _______________ _______________ position sensor in place of brake lamp switches.

Answer 18

break pedal

Question 19

The brake lamps, turn signals, and hazard flash- ers on many late-model vehicles are operated by a _______________ _______________ connected to the computer network.

Answer 19

lighting module

Question 20

The _______________ _______________ switch has replaced the pressure differential valve warn- ing switch on most vehicles.

Answer 20

warning lamp

Question 21

Technician A says that a 100 percent copper tube is often used as a brake line material. Technician B says there is a copper-nickel alloy brake tubing that meets SAE Standard J1047 and ISO 4038. Who is correct?

Answer 21

B only

Question 22

Technician A says that a 100 percent copper tube is often used as a brake line material. Technician B says there is a copper-nickel alloy brake tubing that meets SAE Standard J1047 and ISO 4038. Who is correct?

Answer 22

B only

Question 23

Technician A says fittings with an external taper is simply called a standard flare. Technician B says a fitting with an internal taper is called an inverted or LAP flare. Who is correct?

Answer 23

both

Question 24

Technician A says that a metering valve delays the application of the rear drum brakes. Technician B says that the metering valve is only needed on four-wheel disc brake vehicles. Who is correct?

Answer 24

Neither

Question 25

Technician A says on many vehicles the lighting module controls the brake lamps and turn signals. Technician B says that these vehicles use the turn signal switch as an input to the lighting module. Who is correct?

Answer 25

both

Question 26

Technician A says that a proportioning valve pro- vides greater pressure to the rear drum brakes during normal vehicle load. Technician B says that a proportioning valve provides lower pres- sure to the front disc brakes during initial brake application. Who is correct?

Answer 26

neither

Question 27

While discussing electrically actuated parking brakes, Technician A says these systems operate via electric actuators located on the rear brake calipers, or by electric cable actuators. Technician B says these actuators are controlled by their own control module. Who is correct?

Answer 27

both

Question 28

Technician A says some vehicles use tubing sized in metric diameters. Technician B says some common metric diameters are 4.75 mm, 6 mm, 8 mm, and 10 mm. Who is correct?

Answer 28

both

Question 29

While discussing mechanical brake lamp switches, Technician A says the stop-lamp switch is a normally open momentary contact switch. Technician B says the same circuit is used to alert the ABS to monitor wheel speed sensors during braking. Who is correct?

Answer 29

both

Question 30

While discussing brake pad wear indicators, Technician A says that many brake pads utilize a simple scraper built into the brake pad itself that touches the rotor when the pads wear down. Technician B says the scraping sound goes away when the brakes are released. Who is correct?

Answer 30

A only