IICL CHASSIS LATEST
INSPECTOR EXAM
What does BIT stand for? - ANSWERS-Biennial Inspection of
Terminals
What does CVSA stand for? - ANSWERS-Commercial Vehicle Safety
Alliance
When is a BIT required? - ANSWERS-Vehicles must be periodically
inspected with 90-day intervals or sooner, if necessary, to ensure safe
operation.
What are the minimum inspection requirements for a BIT? -
ANSWERS-a) brake adjustment
b) brake system components and leaks
c) steering and suspension systems
d) tires and wheels
e) vehicle connecting devices (fifth wheels, kingpins, pintle hooks, etc.)
What must a BIT report include? - ANSWERS-a) identification of
vehicle
b) date and nature of each inspection and repair performed
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PAGE
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, IICL CHASSIS LATEST
INSPECTOR EXAM
c) signature of authorized rep
How long must BIT reports be retained? - ANSWERS-At least 2 years
What are the FMCSA record keeping requirements? - ANSWERS-
Motor carrier must retain the original copy of report for 14 months
following date of inspection. Drivers who receive docs must sign and the
motor carrier must maintain that receipt for 12 mos. from date of receipt.
What is the controlling document for chassis inspections? - ANSWERS-
49 CFR 396.17 (FMCSA periodic inspection requirements)
What is traction control? - ANSWERS-Helps the ABS improve vehicle
traction by minimizing wheel slip on the drive axle during acceleration.
What is ABS? - ANSWERS-Antilock braking systems are electronic
systems that monitor and control wheel slip during vehicle braking.
What are the components of ABS? - ANSWERS-electronic control unit
(ECU), wheel speed sensors, modulator valves, exciter rings
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PAGE
2
, IICL CHASSIS LATEST
INSPECTOR EXAM
In ABS, what is the function of the electronic control unit (ECU)? -
ANSWERS-Processes all ABS info and signal functions. Receives and
interprets voltage pulses generated by the sensor pickup as the exciter
teeth pass by, and uses this info to determine: (a) impending wheel lock,
and (b) when/how to activate the ABS modulator valves.
In ABS, what is the function of the modulator valves? - ANSWERS-
Regulate air pressure to the brakes during ABS action. ECU commands
mod valve to either change the air pressure to the brake chamber, or hold
the existing pressure.
In ABS, what are the 2 main components of the wheel speed sensors? -
ANSWERS-(1) exciter, and (2) pickup
In ABS, what is an exciter? - ANSWERS-A ring with notched teeth,
also known as sensor ring, tooth wheel, tone ring, and exciter.
In ABS, what is an pickup? - ANSWERS-Commonly called "the sensor"
which contains a wire coil/magnet assembly, which generates pulses of
electricity as teeth of the exciter pass in front of it.
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PAGE
3
INSPECTOR EXAM
What does BIT stand for? - ANSWERS-Biennial Inspection of
Terminals
What does CVSA stand for? - ANSWERS-Commercial Vehicle Safety
Alliance
When is a BIT required? - ANSWERS-Vehicles must be periodically
inspected with 90-day intervals or sooner, if necessary, to ensure safe
operation.
What are the minimum inspection requirements for a BIT? -
ANSWERS-a) brake adjustment
b) brake system components and leaks
c) steering and suspension systems
d) tires and wheels
e) vehicle connecting devices (fifth wheels, kingpins, pintle hooks, etc.)
What must a BIT report include? - ANSWERS-a) identification of
vehicle
b) date and nature of each inspection and repair performed
END OF
PAGE
1
, IICL CHASSIS LATEST
INSPECTOR EXAM
c) signature of authorized rep
How long must BIT reports be retained? - ANSWERS-At least 2 years
What are the FMCSA record keeping requirements? - ANSWERS-
Motor carrier must retain the original copy of report for 14 months
following date of inspection. Drivers who receive docs must sign and the
motor carrier must maintain that receipt for 12 mos. from date of receipt.
What is the controlling document for chassis inspections? - ANSWERS-
49 CFR 396.17 (FMCSA periodic inspection requirements)
What is traction control? - ANSWERS-Helps the ABS improve vehicle
traction by minimizing wheel slip on the drive axle during acceleration.
What is ABS? - ANSWERS-Antilock braking systems are electronic
systems that monitor and control wheel slip during vehicle braking.
What are the components of ABS? - ANSWERS-electronic control unit
(ECU), wheel speed sensors, modulator valves, exciter rings
END OF
PAGE
2
, IICL CHASSIS LATEST
INSPECTOR EXAM
In ABS, what is the function of the electronic control unit (ECU)? -
ANSWERS-Processes all ABS info and signal functions. Receives and
interprets voltage pulses generated by the sensor pickup as the exciter
teeth pass by, and uses this info to determine: (a) impending wheel lock,
and (b) when/how to activate the ABS modulator valves.
In ABS, what is the function of the modulator valves? - ANSWERS-
Regulate air pressure to the brakes during ABS action. ECU commands
mod valve to either change the air pressure to the brake chamber, or hold
the existing pressure.
In ABS, what are the 2 main components of the wheel speed sensors? -
ANSWERS-(1) exciter, and (2) pickup
In ABS, what is an exciter? - ANSWERS-A ring with notched teeth,
also known as sensor ring, tooth wheel, tone ring, and exciter.
In ABS, what is an pickup? - ANSWERS-Commonly called "the sensor"
which contains a wire coil/magnet assembly, which generates pulses of
electricity as teeth of the exciter pass in front of it.
END OF
PAGE
3
