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HEAVY TRUCK BRAKES MICHIGAN MECHANIC STUDY EXAM AND PRACTICE EXAM NEWEST ACTUAL EXAM COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A$25.49
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HEAVY TRUCK BRAKES MICHIGAN MECHANIC STUDY EXAM AND PRACTICE EXAM NEWEST ACTUAL EXAM COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A
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Course
HEAVY TRUCK BRAKES MICHIGAN MECHANIC
Institution
HEAVY TRUCK BRAKES MICHIGAN MECHANIC
HEAVY TRUCK BRAKES MICHIGAN MECHANIC
STUDY EXAM AND PRACTICE EXAM NEWEST ACTUAL
EXAM COMPLETE QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+
When a truck has no air pressure in its tanks, which warning devices are activated when
the ignition key is turned on? -...
HEAVY TRUCK BRAKES MICHIGAN MECHANIC
STUDY EXAM AND PRACTICE EXAM NEWEST ACTUAL
EXAM COMPLETE QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+
When a truck has no air pressure in its tanks, which warning devices are activated when
the ignition key is turned on? - CORRECT ANSWER A buzzer, a dash gauge and a
red light
What legislation mandates every required standard of a highway truck air brake
system? - CORRECT ANSWER FMVSS 121
If a truck is FMVSS 121 compliant, which of the following air reservoirs must be
incorporated into the air brake circuit? - CORRECT ANSWER Supply, primary and
secondary tanks
In a truck air brake system which sub circuit is primarily responsible for actuating front
axle service brakes when the system is functioning normally? - CORRECT ANSWER
Secondary circuit
When a FMVSS 121 compliant tractor trailer combination is moving down the highway
at a speed of 50 mph, which circuit must be charged with air? - CORRECT ANSWER
Hold off circuit
What best describes the functions of a tractor protection valve? - CORRECT ANSWER
Pressure protects the tractor air supply in the event of loss of pressure in a trailer
Routes trailer supply air and service application signal to the trailer pneumatic circuits
Blocks service signal air to the trailer until trailer air supply is activated
If you have yo make an adjustment to air system cut off pressure where should the
adjustment be made? - CORRECT ANSWER The governor
How is the relay section of an FMVSS 121 compliant duel circuit foot valve activated
when the air brake is functioning properly? - CORRECT ANSWER Pneumatically
What is the function of a quick release gladhand when used? - CORRECT ANSWER
Speeds service brake release timing
What best accounts for brake feel in an air brake system? - CORRECT ANSWER
Resistance of application pressure versus for pressure
, What is the potential energy of an air brake system? - CORRECT ANSWER
Compressed air
When a tractor spring brake assembly is charged with air on both its service and hold
off chambers what results is known as? - CORRECT ANSWER Compounding
What is true about hold off pressure in current truck and trailer air brake systems? -
CORRECT ANSWER Its regulated at 90 psi.
What is the minimum compressed air reservoir volume dedicated to the air brakes
required by an FMVSS 121 compliant highway trailer? - CORRECT ANSWER 8 times
total brake chamber volume
What term is used to describe a truck safety pressure relief valve? - CORRECT
ANSWER Pop off valve
What pressure is a pop off valve set to trip at in most highway truck applications? -
CORRECT ANSWER 150 psi.
When an inversion valve is activated, what happens? - CORRECT ANSWER Some
hold off air is exhausted
When a properly functioning treadle valve is actuated by foot pressure, which of the
following will determine what pressure is metered out to actuate the primary and
secondary service circuits?
A. Mechanical force is applied to the treadle
B. Actual travel of the primary piston
C. Actual system pressure at the time of the application
D. Mechanical force applied to the relay piston - CORRECT ANSWER Mechanical
force applied to the treadle
Technician A says that the relay section of a dual circuit foot valve is actuated
mechanically under normal operation. Technician B says that a primary piston of a foot
valve is actuated mechanically under normal operation. Who is correct? - CORRECT
ANSWER Tech B
Technician A says that a trailer service brake signal is always sourced from the tractor
primary circuit. Technician B says that a trailer service signal can only pass through a
tractor protection valve when it is in its ON state. Who is correct? - CORRECT ANSWER
Tech B
Technician A says that most current highway tractors use a 3-line TP valve. Technician
B says that a 2-line TP valve will remain OFF until the trailer air supply dash button is
depressed. Who is correct? - CORRECT ANSWER Tech B
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