IN CAB INTERNAL INSPECTION - CDL Class A
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Verified | Latest Update 2026
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Terms in this set (16)
Air Gauge and Governor Cutoff Chock the wheels, start the vehicle and inspect
Check that the air gauge is working and builds the air
pressure to governor cutoff (approximately 120 -
140 psi) and identify the cutoff pressure for your
vehicle.
Air Leakage Rate Test Shut off the engine, return the key to the "on" or
"battery charge" position, release the parking
brake (all vehicles), and the tractor protection
valve (combination vehicle).
Fully apply the foot brake. Once the air gauge is
stabilized, hold the foot brake for one (1) minute.
Inspect the air gauge to see if the air pressure
drops more than four (4) pounds in one (1) minute
(combination vehicle).
Air Warning Device(s) Test Without re-starting the engine, make sure the key
or electrical power is in the "on" or "battery
charge" position.
Begin fanning off the air pressure by applying
and releasing the foot brake.
The low air warning devices (buzzer, light, and
flag) should activate before air pressure drops
below 55 psi or level specified by the
manufacturer. It is the applicant's responsibility to
know the vehicle manufacturer's specifications.
Exam | Questions with 100% Correct Answers |
Verified | Latest Update 2026
Save
Terms in this set (16)
Air Gauge and Governor Cutoff Chock the wheels, start the vehicle and inspect
Check that the air gauge is working and builds the air
pressure to governor cutoff (approximately 120 -
140 psi) and identify the cutoff pressure for your
vehicle.
Air Leakage Rate Test Shut off the engine, return the key to the "on" or
"battery charge" position, release the parking
brake (all vehicles), and the tractor protection
valve (combination vehicle).
Fully apply the foot brake. Once the air gauge is
stabilized, hold the foot brake for one (1) minute.
Inspect the air gauge to see if the air pressure
drops more than four (4) pounds in one (1) minute
(combination vehicle).
Air Warning Device(s) Test Without re-starting the engine, make sure the key
or electrical power is in the "on" or "battery
charge" position.
Begin fanning off the air pressure by applying
and releasing the foot brake.
The low air warning devices (buzzer, light, and
flag) should activate before air pressure drops
below 55 psi or level specified by the
manufacturer. It is the applicant's responsibility to
know the vehicle manufacturer's specifications.
