True/False
Indicate whether the sentence or statement is true
or false.
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1.
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Under
warranty, machining brake rotors and drums on a bench mounted brake lathe is an accepted
practice.
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2.
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“Hub Face” runout does not effect the lateral runout of a brake
rotor.
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3.
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The
faster a wheel rotates, the higher the frequency produced by a wheel speed sensor.
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Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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4.
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What
procedure must be performed before installing a new brake master cylinder? a. | vacuum booster
pushrod adjustment | b. | bench bleeding of master cylinder | c. | master cylinder
piston travel measurment | d. | all of the above are correct | | |
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5.
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Which
of the following conditions regarding the brake master cylinder is considered
normal? a. | brake reservior
cap/diaphram is swelled and soft | c. | wetness is present on booster below master
cylinder | b. | brake lines at master cylinder are slightly wet with
fluid | d. | all of the above
are correct | | | | |
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6.
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Technician A says that when using the ProCut on car brake lathe, if the
“ready to cut” light is illuminated the lateral runout of the machine is <.001”.
Technician B says that if the “ready to cut” and “optimum” lights are
illuminated the lateral runout of the machine is <.001”.
Who is
correct? a. | A
only | c. | Both A and
B | b. | B
only | d. | Neither A nor
B | | | | |
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7.
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What
condition could lead to excessive rotor thickness variation? a. | excessive hub
face runout | c. | incorrect wheel
torque procedure | b. | excessive rotor lateral runout | d. | all of the above are correct | | | | |
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8.
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A
braking system stops a vehicle by changing the vehicle’s ______________ into ________________.
a. | kenetic engergy,
potential energy | c. | potential
energy, heat energy | b. | kenetic energy, heat energy | d. | heat energy, kenetic energy | | | | |
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9.
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Which
of the following occurs as the amount of moisture in the brake fluid increases? a. | the brake fluid
turns yellow | c. | the brake fluid
boiling point decreases | b. | the brake fluid boiling point
increases | d. | the brake fluid
loses its color. | | | | |
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10.
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A
diagonally split brake system refers to a system that is a: a. | dual master
cylinder system which is devided front to rear. | b. | dual master
cylinder system which has each front brake connected to the opposite rear
brake. | c. | single master cylinder which is devided side to
side | d. | none of the
above are correct | | |
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11.
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Technician A says that vacuum boosters have two sealed chambers divided by a
diaphragm. Technician B says that when the brakes are applied a vacuum booster has an
electronically controlled vacuum port that opens to the outside atmosphere. Who is correct?
a. | A
only | c. | Both A and B
| b. | B only
| d. | Niether A nor
B | | | | |
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12.
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The
most common source of brake pedal pulsation is ______________. a. | warped
rotors | c. | loose wheel
bearings | b. | thickness variation | d. | loose brake pad material | | | | |
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13.
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Fluid
leaking from a wheel cylinder or caliper piston dust boot indicates that the dust boot is
leaking internally.
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14.
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Which
of the following statements apply to servicing a vehicle with contaminated brake
pads? a. | Contaminated
pads should be sanded. | b. | Find the cause of the contamination and replace the brake
pads | c. | Clean the pads
using brake cleaner | d. | Clean the pads using soap and water | | |
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15.
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Which
of the following scenarios would you most likely bleed the brake system? a. | after replacing
the brake pads | c. | after cutting a
rotor | b. | after replacing a drum | d. | after replacing a caliper | | | | |
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16.
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Which
of the following is a characteristic of the Hydro-Boost braking system? a. | the power
steering pump provides the hydraulic pressure | b. | the power
steering pump circulates hydraulic fluid at maximum pressure | c. | the booster
cylinder bleed valve is open when the booster is applied | d. | during booster
operation the booster valve closes the pressure port. | | |
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17.
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Which
valve prevents front brakes application before the rear brakes begin to work? a. | metering
valve | c. | pressure
differential valve | b. | proportioning valve | d. | bleeder valve | | | | |
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18.
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If a
leak develops in either the primary of secondary brake system, which valve illuminates the BRAKE
warning lamp? a. | metering
valve | c. | pressure
differential/shuttle valve | b. | proportioning valve | d. | bleeder valve | | | | |
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19.
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Whenever you are bleeding a brake system that is front-rear split you must bleed the
system in which order? a. | RR/LR/RF/LF | c. | RF/LF/RR/RF | b. | LR/RR/LF/RF | d. | LR/RF/LR/RR | | | | |
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20.
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Where
can you find a rotor’s minimum thickness specifications? a. | stamped on the
rotor | c. | Both A and B are
correct | b. | in the workshop manual | d. | None of the above are correct | | | | |
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21.
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What
is the first step in the diagnostic process? a. | determine the cause | c. | verify the symptom | b. | determine the
system with the failure | d. | determine the
faulty component | | | | |
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22.
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What
is indicated if there is a small squirt or geyser in the master cylinder reservoir during brake
application? a. | an external
leak | c. | the BOO switch
is holding the pedal in the partially applied position | b. | an internal
leak | d. | this is a normal
condition | | | | |
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23.
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The
_________ port allows a path for expanding fluid to escape when the brakes are not
applied. a. | fill
| c. | primary
| b. | secondary
| d. | compensator
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24.
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What
must be done prior to machining a rotor or drum? a. | measure and determine discard dimensions
| b. | clean hub
flanges on composite rotors | c. | inspect for cracks and scoring | d. | all of the above
are correct. | | |
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25.
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What
should be done to the opposite brake drum if one has to be refinished? a. | nothing
| c. | machine the drum
to within 0.030” of the diameter of the other | b. | lightly sand the
opposite drum to remove any score marks | d. | machine the drum to within 0.3” of the diameter of the
other | | | | |
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26.
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How
can a technician determine if a brake drum is “Bell-Mouthed”? a. | measuring at
different positions around the drum | b. | measuring at different depths within the drum
| c. | measuring the
T.I.R. of the drum | d. | measuring the “Hub Face” runout of the
drum | | |
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27.
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A
2003 Super-Duty has an ABS misfire under normal braking conditions. This could be caused by all of
the following EXCEPT: (think about this, during an ABS misfire the inlet/isolation valves,
outlet/dump valve, and pump motor are operating) a. | wheel speed loose mounting | c. | mismatched or worn tires | b. | pump motor power
pin corrosion | d. | excitor ring
damage | | | | |
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28.
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Most
3 and 4 channel ABS systems return fluid to the hydraulic system using: a. | a spring loaded
accumulator | c. | a pump and motor
assembly | b. | pressure from the brake pedal | d. | gravity | | | | |
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29.
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Which
of the following components controls ABS operation? a. | HCU | c. | brake pressure
control valve | b. | ABS control module | d. | Anti-lock main power relay | | | | |
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30.
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Technician A says that the ABS pump motor provides pressure during normal
braking. Technician B says that during normal braking the outlet/dump valve is closed. Who is
correct? a. | A
only | c. | Both A and
B | b. | B
only | d. | Neither A nor
B | | | | |
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31.
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What
action is accomplished by opening the normally closed Outlet/Dump Valve? a. | pressure trapped
between the master cylinder and the Inlet/Isolation valve is released | c. | pressure trapped between the reservoir and master cylinder is
released | b. | pressure trapped between the wheel brake assembly and
Inlet/Isolation valve is released | d. | pressure trapped between the Outlet/Dump valve and the
pump/motor is released | | | | |
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32.
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Which
statement correctly descibes the term “Knock Back”? a. | it is how much a
drum brake wheel cylinder piston is pushed back onto the backing plate by loose axle
bearings | b. | it is how much a disc caliper piston is pushed back into a
caliper by loose wheel bearings | c. | what i do to insubordinate fools who try to be smarter than me.
| d. | don’t
choose this one, i did not want to think about any other possible answers. This is harder than you
think; you know the thinking part and all. | | |
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33.
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The
two types of flares used on modern vehicle brakes lines are __________. a. | ASE and
DOT | c. | Double 30°
SAE Flare and ISO bubble | b. | Double 45° SAE Flare and ISO
bubble | d. | Flat flare and
compensate flare | | | | |
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34.
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Technician A says that a scan tool may be necessary to bleed some ABS hydraulic
control units. Technician B says that every ABS Bleed procedure is exactly the same. Who is
correct? a. | A only
| c. | Both A and B
| b. | B
only | d. | Neither A nor
B | | | | |
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Matching
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Match
the procedure described with the neme of the procedure. a. | 1st person
presses the brake pedal, 2nd person monitors the reservior for gysers. | b. | 1st person pumps
the brake pedal 10-20 times and holds final pump, 2nd person monitors for gysers while 1st person
releases final held pressure. | c. | 1st person pumps brake pedal 10 times and holds final pump, 2nd
person attempts to turn each wheel with a minimum of 75-100lbs of force. | d. | 1st person
presses down on the brake pedal with 100lbs of force and measures brake pedal travel without booster
operation. | | |
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35.
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Air
Entrapment Test
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36.
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Brake
Pedal Travel Test
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37.
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Compensator Port Test
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38.
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Master Cylinder Bypass Test
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Match
the descriptions about the different types of wheel speed sensors with the correct type. Each option
MAY be used multiple times. a. | Active Wheel Speed Sensor | b. | Passive
Wheel Speed Sensor | c. | Both Active and Passive | | |
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39.
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is a
variable reluctance sensor that produces voltage
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40.
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is
not useful at speeds lower than 3mph.
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41.
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as
speed increase the frequency of the signal increases
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42.
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cannot be tested by measuring resistance of the sensor
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43.
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can
indicate speeds lower than 3mph
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44.
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produces a square wave as the excitor tooth passes
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