Page 1 of 78
LOUISIANA CLASS D CHAUFFEUR’S LICENSE
EXAM*** QUESTIONS AND ANSWERS |
VERIFIED AND WELL DETAILED ANSWERS
|DOWNLOAD AND PASS | LATEST EXAM
UPDATE 2026/2027
All trailers or semi-trailers with a gross vehicle weight
rating of ____ or more must be equipped with brakes
adequate to stop and hold it.
❖3,000 pounds
Drivers should use ____ as the principal means of
controlling speed on long grades.
❖Engine compression
If your brakes should fail on a level road, you should ____
and use engine compression to slow down
,Page 2 of 78
❖Downshift
Air brake systems are three braking systems combined:
the ____ brake system, the ____ brake system, and the
____ brake system
❖Service, parking, emergency
____ brake system applies and releases the brakes when
you use the brake pedal during normal driving
❖Service
____ brake system applies and releases the parking brakes
when you use the parking brake control
❖Parking
,Page 3 of 78
____ brake system uses part of the service and parking
brake's system to stop the vehicle in the event of a brake
system failure
❖Emergency
Pumps air into the air storage tanks (reservoirs)
❖Air compressor
Controls when the air compressor will pump air into the
air storage tanks
❖Air compressor governor
Used to hold compressed air
❖Air storage tanks
, Page 4 of 78
Operated by turning a quarter turn or by pulling a cable.
You must drain the tanks yourself at the end of each day
of driving
❖Manual air tank drain
Water and oil is automatically expelled. They may be
equipped for manual
draining as well
❖Automatic air tank drain
Protects the tank and the rest of the system from too
much pressure. The valve is usually set to open at 150 psi
❖Safety valve
LOUISIANA CLASS D CHAUFFEUR’S LICENSE
EXAM*** QUESTIONS AND ANSWERS |
VERIFIED AND WELL DETAILED ANSWERS
|DOWNLOAD AND PASS | LATEST EXAM
UPDATE 2026/2027
All trailers or semi-trailers with a gross vehicle weight
rating of ____ or more must be equipped with brakes
adequate to stop and hold it.
❖3,000 pounds
Drivers should use ____ as the principal means of
controlling speed on long grades.
❖Engine compression
If your brakes should fail on a level road, you should ____
and use engine compression to slow down
,Page 2 of 78
❖Downshift
Air brake systems are three braking systems combined:
the ____ brake system, the ____ brake system, and the
____ brake system
❖Service, parking, emergency
____ brake system applies and releases the brakes when
you use the brake pedal during normal driving
❖Service
____ brake system applies and releases the parking brakes
when you use the parking brake control
❖Parking
,Page 3 of 78
____ brake system uses part of the service and parking
brake's system to stop the vehicle in the event of a brake
system failure
❖Emergency
Pumps air into the air storage tanks (reservoirs)
❖Air compressor
Controls when the air compressor will pump air into the
air storage tanks
❖Air compressor governor
Used to hold compressed air
❖Air storage tanks
, Page 4 of 78
Operated by turning a quarter turn or by pulling a cable.
You must drain the tanks yourself at the end of each day
of driving
❖Manual air tank drain
Water and oil is automatically expelled. They may be
equipped for manual
draining as well
❖Automatic air tank drain
Protects the tank and the rest of the system from too
much pressure. The valve is usually set to open at 150 psi
❖Safety valve
