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Chapter 109 Power Brake Unit Operation, Diagnosis, and Service

Quiz by Matt Lobdell

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24 questions
Show answers
  • Q1

    A power brake booster provides which of the followingdesign features?

    Reduced stopping distance

    High brake pedal effort

    Reduced pedal effort

    A lower brake pedal position

    30s
  • Q2

    The proper operation of a vacuum brake booster requires that the engine be capable of supplying at least ________.

    21 in. Hg vacuum

    15 in. Hg vacuum

    17 in. Hg vacuum

    19 in. Hg vacuum

    30s
  • Q3

    A defective vacuum brake booster will cause a________.

    hard brake pedal

    low brake pedal

    soft (spongy) brake pedal

    slight hiss noise when the brake pedal is depressed

    30s
  • Q4

    A brake pedal feels spongy when depressed. Technician A says that a defective hydraulic brake booster could be the cause. Technician B says that a defective vacuum brake booster could be the cause. Which technician is correct?

     Technician A only

     Technician B only

    Both technicians

    Neither technician

    30s
  • Q5

    Two technicians are discussing vacuum brake boosters. Technician A says that a low, soft brake pedal is an indication of a defective booster. Technician B says that there should be at least two power-assisted brake applications after the engine stops running. Which technician is correct?

    Technician A only

    Technician B only

    Both technicians

    Neither technician

    30s
  • Q6

    Technician A says that to check the operation of a vacuum brake booster, the brake pedal should be depressed until the assist is depleted and then start the engine. Technician B says that the brake pedal should drop when the engine starts, if the booster is okay. Which technician iscorrect?

    Technician A only

    Technician B only

    Both technicians

    Neither technician

    30s
  • Q7

    Which of these could be caused by an improperly adjusted booster pushrod?

    A soft pedal

    Brakes to overheat

    A low pedal

    None of these

    30s
  • Q8

    An accumulator, such as that used on hydraulic brake boosters________.

    provides higher force being fed back to the driver'sfoot

    provides a reserve in the event of a failure

    reduces brake pedal noise

    works against engine vacuum

    30s
  • Q9

    The first step in diagnosing a Hydro-Boost problem is________.

    a thorough visual inspection

    to tighten the power steering drive belt

    a pressure test of the pump

    a volume test of the pump

    30s
  • Q10

    If the engine stops running, what is the most likely to occur if the vehicle is equipped with a Hydro-Boost power brake system?

    A low and spongy brake pedal

    A high and hard brake pedal

    Greatly reduced braking distance but a normal feeling brake pedal

    Normal braking using the accumulator pressure

    30s
  • Q11

    Two technicians are discussing vacuum brake boosters. Technician A says that when the engine is running and the driver's foot is off the brake pedal, a vacuum is present on both sides of the booster diaphragm. Technician B says that when the brakes are in the applied position, vacuum is present on the front side of the diaphragm. Which technician is correct?

    Technician A only

    Technician B only

    Both technicians

    Neither technician

    30s
  • Q12

    To provide the driver with a sense of "feel"during braking, vacuum boosters use a ________.

    return spring

    pressure restrictor

    diaphragm spacer

    vacuum diverter

    30s
  • Q13

    A hydraulically operated booster unit stores fluid under pressure by means of a(n) ________.

    accumulator

    actuator

    pressure chamber

    boost piston

    30s
  • Q14

    A common source of vacuum for boosters used on diesel engines is ________.

    exhaust manifold

    carburetor

    auxiliary vacuum pump

    intake manifold

    30s
  • Q15

    Technician A says when the brakes are applied in a vacuum booster, the vacuum control valve is closed. Technician B says the vacuum control valve is opened. Which technician is correct?

    Technician A only

    Technician B only

    Both technicians

    Neither technician

    30s

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