True/False
Indicate whether the
statement is true or false.
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1.
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Disc brakes require more force than drum brakes to achieve the same braking
effort.
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2.
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Drum brake hardware includes return springs, holddown parts, and
linkages.
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3.
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Many manufacturers recommend changing the brake fluid periodically.
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4.
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Brake service on an ABS-controlled vehicle is similar to that of a non-ABS
equipped vehicle.
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5.
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When hydraulic pressure is diminished, the caliper piston seal functions as a
return spring to retract the piston.
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6.
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Pumping the brake pedal quickly during ABS activation will assist the antilock
brake system to function properly.
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7.
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A self-adjuster screw mechanism can be positioned on either the left or the
right side of the vehicle.
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8.
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DOT 3 is the brake fluid type recommended for most ABS systems and some power
brake systems.
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9.
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Parking brake mechanisms provide a hydraulic force to apply the brake shoes and
keep the vehicle stationary.
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10.
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An ABS speed sensor may be located on an axle’s differential gear
housing.
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11.
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To remove pitting or scoring, an aluminum master cylinder should be honed while
being rebuilt.
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12.
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Never spin bearings with compressed air.
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13.
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Drum brakes are still used on the front wheels of many late model cars and light
trucks.
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14.
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Brake hoses are typically rigid steel lines used to transmit brake fluid
pressure.
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15.
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ABS solenoid valves are electrically operated by signals from the control
module.
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16.
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A brake line must be single-flared to provide a good seal at a joint or junction
block.
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17.
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A typical floating caliper housing is designed with one caliper piston.
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Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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18.
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The power brakes in a vehicle are grabbing. Technician A checks for
grease or oil on the brake shoe and pad linings. Technician B immediately investigates the
power unit. Who is correct?
a. | A only | c. | Both A and B | b. | B only | d. | Neither A nor B |
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19.
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Which of the following is not likely to cause a pulsating brake
pedal?
a. | Excessive lateral runout | c. | Loose wheel
bearings | b. | Worn brake pad linings | d. | Non-parallel rotors |
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20.
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Which of the following fluids should be used in brake systems?
a. | Transmission oil | c. | Power steering fluid | b. | Engine oil | d. | None of the
above |
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21.
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The function of the wheel cylinder is to:
a. | Prohibit the shoe from following the movement of the rotating
drum | b. | Provide the rubbing surface area for the linings | c. | Convert hydraulic
pressure to a mechanical force at the drum brakes | d. | Maintain correct shoe position and
clearance |
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22.
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In the unapplied position, drum brake shoes are held against the anchor
pin by the:
a. | Return springs | c. | Star wheel adjuster | b. | Holddown springs | d. | Shoe holddown |
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23.
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While discussing quick take-up master cylinders, Technician A says this
design is used with low-drag caliper pistons. Technician B says this design is only used on
disc brake systems. Who is correct?
a. | A only | c. | Both A and B | b. | B only | d. | Neither A nor B |
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24.
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Which of the following is not associated with a pedal pulsation
problem?
a. | High lateral runout | c. | Poor parallelism | b. | Excessive wheel lug nut
torque | d. | Air in the hydraulic
system |
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25.
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Linings are ____ to disc brake pads.
a. | Riveted | c. | Both a and B | b. | Bonded | d. | Neither A nor B |
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26.
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Technician A says brake linings are riveted to the brake shoes.
Technician B says brake linings are bonded to the brake shoes. Who is correct?
a. | A only | c. | Both A and B | b. | B only | d. | Neither A nor B |
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27.
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In a typical drum brake, which component provides a foundation for the brake
shoes and associated hardware?
a. | Lining | c. | Drum | b. | Wheel cylinder | d. | Backing plate |
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28.
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Which of the following can lead to brake hose failure?
a. | Stressing the hose during installation | c. | Heat and fluid
contaminants | b. | Improperly matched fittings | d. | All of the above |
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29.
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Which of the following is not a component of an antilock brake
system?
a. | Solenoid valve body assembly | c. | Master cylinder | b. | Power steering
pump | d. | Wheel
sensors |
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30.
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A buildup of brake dust and dirt between the lining and the drum is the most
common cause of a:
a. | Barrel-shaped drum | c. | Scored drum surface | b. | Taper-shaped drum | d. | Threaded drum
surface |
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31.
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Before removing the master cylinder on an ABS system with a high pressure
accumulator, the accumulator must be discharged by:
a. | Loosening a bleeder screw on the master cylinder with the ignition
on | b. | Loosening the accumulator one-eighth of a turn with the ignition switch
off | c. | Disconnecting the pump motor and pumping the brake pedal ten
times | d. | Pumping the brake pedal twenty-five times with the ignition
off |
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32.
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Technician A says power brakes are designed with vacuum-assisted units
that use engine vacuum. Technician B says power brakes are designed with vacuum-assisted units
that use vacuum developed by an external pump. Who is correct?
a. | A only | c. | Both A and B | b. | B only | d. | Neither A nor B |
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33.
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What channels the flow of air over the exposed rotor surfaces?
a. | Hub assembly | c. | Webs | b. | Caliper assembly | d. | Splash shield |
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34.
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Rotors are typically made from:
a. | Aluminum | c. | Both A and B | b. | Cast iron | d. | Neither A nor B |
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35.
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Which of the following could cause an extremely hard brake pedal?
a. | Excessively worn brake pads | b. | Air in the system | c. | A leaking diaphragm
in the vacuum power booster | d. | Use of the wrong
fluid |
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36.
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Technician A says an out-of-round drum can cause a pulsating brake pedal.
Technician B says an out-of-round drum can cause the brakes to grab. Who is correct?
a. | A only | c. | Both A and B | b. | B only | d. | Neither A nor B |
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37.
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The purpose of the master cylinder is to:
a. | Supply mechanical force to the brake mechanisms | b. | Automatically pump
the brakes during panic stops | c. | Generate the hydraulic pressure needed to apply
the brake mechanisms | d. | All of the
above |
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38.
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Brake linings should be replaced when linings are:
a. | Contaminated with oil or grease | b. | Worn to within 1/32 inch (.794 mm) of a rivet
head | c. | Contaminated with brake fluid | d. | All of the
above |
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39.
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Caliper housings are made from:
a. | Aluminum | c. | Both A and B | b. | Cast iron | d. | Neither A nor B |
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40.
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Technician A says a ventilated rotor helps cool the disc brake assembly.
Technician B says the splash shield helps cool the disc brake assembly. Who is correct?
a. | A only | c. | Both A and B | b. | B only | d. | Neither A nor B |
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41.
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Technician A says it is acceptable to replace brake pads on one side of
the vehicle only. Technician B says it is normal for the inboard pad to be worn more than the
outside pad. Who is correct?
a. | A only | c. | Both and B | b. | B only | d. | Neither A nor B |
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42.
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Disc brake rotor conditions are being discussed. Technician A services
the rotor if it has lateral runout, lacks parallelism, or is scored. Technician B services the
rotor if it is heat checked or is rusty. Who is correct?
a. | A only | c. | Both A and B | b. | B only | d. | Neither A nor B |
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43.
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Which type of brake requires greater application force and is commonly used with
power-boost units?
a. | Drum | c. | Both A and B | b. | Disc | d. | Neither A nor B |
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44.
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What prevents moisture from entering the cylinder bore?
a. | The phenolic piston | c. | The caliper drag | b. | The dust boot | d. | The splash
shield |
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45.
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Technician A says it is normal for the amber brake lamp to light when the
ABS is activated during braking. Technician B says it is normal for the amber brake lamp to be
on whenever the ignition is on and the engine is off. Who is correct?
a. | A only | c. | Both A and B | b. | B only | d. | Neither A nor B |
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46.
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The amber ABS brake warning light is illuminated with the engine running. The
most likely cause of this problem is:
a. | A leak at the wheel caliper | c. | A restricted brake
hose | b. | Excessive pedal free play | d. | A faulty wheel speed sensor |
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47.
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While manually bleeding a brake system, Technician A loosens all the
brake bleeder screws at the same time. Technician B uses shop air to push the fluid and air
through the lines and out the bleeder screws. Who is correct?
a. | A only | c. | Both A and B | b. | B only | d. | Neither A nor B |
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48.
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Automatic stability control systems correct oversteer and understeer by applying
____ set(s) of wheel brakes.
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