Principles Of Braking Hydraulics
Chapter 31
- 1.The principle behind hydraulic brakes is _________________, which states that pressure applied to a fluid in one part of a closed system will be transmitted without loss to all other areas of the system.
- A.
Kirchhoff's law
- B.
Newton's law
- C.
Pascal's law
- D.
None of the above
- 2.A substantial leak in the _____________ will prevent enough pressure from building to exert the necessary braking force
- A.
Vacuum booster
- B.
Power steering
- C.
Engine oil
- D.
Hydraulic system
- 3.Which of the following variables is related to pressure and force in a hydraulic system?
- A.
Input force
- B.
Working pressure
- C.
Output force
- D.
All the above
- 4.Which of the following is a main component of a typical hydraulic brake system?
- A.
Brake pedal
- B.
Brake fluid
- C.
Master cylinder
- D.
All of the above
- 5.Which of the following is a property of typical brake fluid used in automobile brake systems?
- A.
High boiling point
- B.
Low freezing point
- C.
Hygroscopic
- D.
All of the above
- 6.Brake fluid is graded by the Department of Transportation on which of the following?
- A.
Color
- B.
PH value
- C.
How much water it can hold
- D.
All of the above
- 7.Determining if brake fluid should be flushed can be done using which of the following methods?
- A.
Test strip
- B.
DVOM-galvanic reaction test
- C.
Time and mileage
- D.
All of the above
- 8.A typical brake pedal inspection includes which of the following?
- A.
Brake pedal height
- B.
Brake pedal free play
- C.
Brake pedal travel
- D.
All the above
- 9.A(n) ____________________ (non-CAN-bus) circuit is a simple light bulb in series with as many as four switches that are connected in parallel with each other.
- A.
Electronic brake warning lamp system
- B.
Mechanical brake warning lamp system
- C.
Both A and B
- D.
None of the above
- 10.True or False. To ensure that a leak in one brake circuit will not affect the other circuit, master cylinder reservoirs have two separate chambers.
- A.
True
- B.
False
- 11.Most modern master cylinder reservoirs are equipped with a low brake fluid float switch that turns on the __________________ on the instrument panel and/or sets a notification on the driver information system.
- A.
Amber brake warning light
- B.
Yellow brake warning light
- C.
Red brake warning light
- D.
None of the above
- 12.___________________ carry brake fluid from the master cylinder to the brake units.
- A.
Double-walled steel lines only
- B.
Rubber hoses only
- C.
Doubled-walled steel lines and rubber hoses
- D.
None of the above
- 13.Brake hoses should never be?
- A.
Pinched
- B.
Kinked
- C.
Bent tighter than a specific radius
- D.
All of the above
- 14.Tech A says that proportioning valves reduce brake pressure to the rear wheels and are pressure-sensitive or load-sensitive. Tech B says that load-sensitive proportioning valves adjust rear brake pressure according to the weight of the vehicle's load. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
- 15.True or False. Many brake hoses use banjo fittings to connect the hose to the wheel unit.
- A.
True
- B.
False
- 16.Banjo-type fittings typically include?
- A.
Banjo fitting
- B.
Banjo bolt
- C.
Two copper or aluminum washers
- D.
All of the above
- 17.Tech A says that a cracked brake hose that is not leaking does not need to be replaced. Tech B says that a brake hose with a blister must be replaced. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
- 18.Tech A says that if none of the brake lights illuminate when depressing the brake pedal, the problem could be the fuse or bulbs. Tech B says that if none of the brake lights illuminate when depressing the brake pedal, the problem could be the feed wire or ground. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
- 19.All of the following are methods used to force air and contaminated fluid out of a brake system in a vehicle, EXCEPT:
- A.
Vacuum bleeding.
- B.
Pressure bleeding.
- C.
Bench bleeding.
- D.
Manual brake bleeding.
- 20.Which of the following can turn on the brake warning light?
- A.
Parking brake being engaged
- B.
Brake fluid level being low
- C.
Pressure being unequal in the brake system
- D.
All of the above
- 21.Tech A says that as moisture levels increase in brake fluid, the boiling point of the brake fluid decreases. Tech B says that field tests by the Society of Automotive Engineers have documented that the average 1-year-old car has approximately 2% moisture in the brake fluid. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
- 22.Tech A says that using gasoline is an approved method of cleaning brake system components. Tech B says that using kerosene is an approved method of cleaning brake system components. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
- 23.Tech A says that when replacing a brake master cylinder, it should be bled after placing the master cylinder into the vehicle's brake system. Tech B says that when replacing a master cylinder, it should be bench bled before the master cylinder is placed into the vehicle's brake system. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
- 24.Tech A says that if there is too much travel in the parking brake lever, the cables should be shortened. Tech B says that if there is too much travel in the parking brake lever, the parking brake (drum or disc) clearance should be checked. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
- 25.Tech A says that in a CAN-bus circuit the parking brake sensor and the low brake fluid sensors send signals over the CAN-bus network regarding their status. Tech B says that diagnosis involves using a scan tool capable of interrogating the system, a wiring diagram, and a DVOM to perform specific tests. Who is correct?
- A.
Tech A
- B.
Tech B
- C.
Both Techs A and B
- D.
Neither Tech A nor B
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