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The ABS light doesn't go off after the engine starts. Technician A states that the parking
brake is not fully released. Technician B states that the brakes can continue to operate
like non-ABS brakes. Who is correct?
A. Technician A
B. Technician B
C. Both technicians
D. Neither technician - Correct answer B-If the amber light is on, it indicates that there is
an ABS fault. The system reverts to regular brake operation without ABS. Technician A
is wrong because the parking brake would only affect the red brake light.
On ABS systems that have a high-pressure accumulator, this is depressurized by:
A. pumping the brake pedal 10 times with the ignition switch on
B. loosening the bleeder screw on the accumulator with the ignition switch on
C. pumping the brake pedal 25 times with the ignition switch off
D. loosening the front wheel bleeder screws with the ignition switch on - Correct answer
C-An ABS with a high-pressure accumulator, you depressurize it by pumping the brake
pedal 25 times while the ignition switch is off. Opening or loosening any part of the
hydraulic system is dangerous because of the fluid pressure.
The ABS and TRACTION OFF indicator lights stay on while the engine is running.
Technician A says to check the TCS and ABS diagnostic trouble codes. Technician B
says to check for TCS or ABS blink codes by connecting two pins of the DLC. Who is
correct?
A. Technician A
B. Technician B
C. Both technicians
D. Neither technician - Correct answer C-Both techs are correct. Checking the
diagnostic trouble codes is possible. It's also possible to check the blink codes with the
DLC.
Technician A is working on a vehicle that was brought in with excessive brake pedal
travel. The technician believes there is most likely an issue with the hydraulic system.
, Technician B believes there is an issue with the lateral runout of the rotor. Which
technician is most likely correct?
A. Technician A
B. Technician B
C. Both Technicians
D. Neither Technician - Correct answer A-Excessive brake pedal travel is a sign of low
hydraulic fluid, air in the hydraulic system, and can be caused by some mechanical
issues as well. It will not be caused by lateral runout, which would cause brake
chattering or pulsing.
A spongy brake pedal may be caused by:
a. ABS Diagnostic Trouble Code set
b. Frozen caliper piston
c. Defective metering valve.
d. Air in hydraulic system - Correct answer D-Air causes a gap in the hydraulic fluid flow
because the fluid has to compress the air before it can apply the piston. This delay
causes the spongy feel. The other choices do not affect this concern.
A vehicle has a very erratic brake pulling concern while applying the brakes. All of the
following items could cause this erratic pull EXCEPT:
a. Excessive tire pressure
b. Four-wheel alignment
c. Seized caliper piston on the other side
d. Steering gear problem - Correct answer A-Excessive tire pressure is the exception
because this fault will cause tire wear but not a pull. Low or uneven tire pressure can
cause a pull.
The brakes are being bled on an older vehicle equipped with a quick take up valve in
the master cylinder. Technician A says the quick take up valve must be depressed.
Technician B says the brakes on this vehicle cannot be bled. Who is right?
a. A only
b. B only
c. Both A and B
d. Neither A nor B - Correct answer D-Both technicians are wrong. The brakes on quick
take up systems use the same bleeding procedure as those without this valve.
A power assist brake booster push rod that is to short will cause which of the following?
a. Excessive brake drag
b. Brake system to be inoperative
c. Excessive brake pedal travel
d. Brake light is illuminated - Correct answer C-A short push rod length will have to
travel farther for contact and result in excessive pedal travel.
A vehicle with disc/drum brakes requires excessive brake pedal effort to stop. The brake
pedal is firm when applied. While starting the engine with the brakes applied, the pedal
does not go down slightly. Technician A says excessive brake pedal freeplay could be