LOUISIANA CLASS D CHAUFFEUR’S LICENSE
2026 REVISION NOTES AND STRUCTURED
COMMERCIAL DRIVER OVERVIEW GUIDE
◉ warning signals must be places ___ behind and ___ in front of the
vehicle and one ____ to the front or rear on the side of the vehicle
facing traffic when it breaks down Answer: 100 ft, 100ft, 10ft
◉ the draw bar used to tow another vehicle must not be more than
___ except when transporting objects which can not be easily
dismembers like poles, pipes, or machinery Answer: 15 ft
◉ the rear view mirror must reflect an image reaching at least ____
behind the vehicle Answer: 200ft
◉ vehicles weighing or carrying more than ___ must be equipped
with extra brakes Answer: 3,000 pounds
◉ ___ brakes are a safe way of stopping large vehicle when used
correctly Answer: air
◉ the three braking systems that make up an air brake system are
Answer: service brake, parking brake, and emergency brake
,◉ the part of the air brake system which pumps air into the air
storage tanks Answer: air compressor
◉ the part of the air brake system which controls when the air
compressor will pump air into the air storage tanks Answer: air
compressor governor
◉ the part of the air brake system which is operated by turning a
quarter turn or by pulling a cable and which must be drained
manually at the end of the day Answer: manual air tank drain
◉ the part of the air brake system in which water and oil are
automatically expelled Answer: automatice air tank drain
◉ the ___ of the air brake system protects the tanks and the rest of
the system from too much pressure. it is usually set at 150 psi. if it
releases air, something is wrong Answer: safety valve
◉ the ___ part of the air brake system tells you how much pressure is
left in the air tanks Answer: supply pressure gauges
◉ the ____ shows you how much air pressure you are applying to the
breaks Answer: application pressure gauge
, ◉ if the air pressure in the tanks falls below ___, the low air pressure
warning will come on. Answer: 60psi
◉ ___ brakes are held back by air pressure and are the mechanical
force which keeps the emergency and parking brakes in place
Answer: spring brakes
◉ in newer vehicles, you engage the parking breaks by using this
knob Answer: diamond-shaped, yellow, push-pull knob
◉ never push the break pedal down when the ___ brakes are on
Answer: spring breaks
◉ the first step to checking the air brakes is to see if the air pressure
drops more than ____ pounds in ___ minute Answer: 3 pounds in 1
minute
◉ the second step to checking the air brakes is to ____ Answer: make
sure the low air pressure warning signals are working
◉ the third step of checking the air brakes is to make sure the
parking brake valve closes at ____psi Answer: 20-40 psi
2026 REVISION NOTES AND STRUCTURED
COMMERCIAL DRIVER OVERVIEW GUIDE
◉ warning signals must be places ___ behind and ___ in front of the
vehicle and one ____ to the front or rear on the side of the vehicle
facing traffic when it breaks down Answer: 100 ft, 100ft, 10ft
◉ the draw bar used to tow another vehicle must not be more than
___ except when transporting objects which can not be easily
dismembers like poles, pipes, or machinery Answer: 15 ft
◉ the rear view mirror must reflect an image reaching at least ____
behind the vehicle Answer: 200ft
◉ vehicles weighing or carrying more than ___ must be equipped
with extra brakes Answer: 3,000 pounds
◉ ___ brakes are a safe way of stopping large vehicle when used
correctly Answer: air
◉ the three braking systems that make up an air brake system are
Answer: service brake, parking brake, and emergency brake
,◉ the part of the air brake system which pumps air into the air
storage tanks Answer: air compressor
◉ the part of the air brake system which controls when the air
compressor will pump air into the air storage tanks Answer: air
compressor governor
◉ the part of the air brake system which is operated by turning a
quarter turn or by pulling a cable and which must be drained
manually at the end of the day Answer: manual air tank drain
◉ the part of the air brake system in which water and oil are
automatically expelled Answer: automatice air tank drain
◉ the ___ of the air brake system protects the tanks and the rest of
the system from too much pressure. it is usually set at 150 psi. if it
releases air, something is wrong Answer: safety valve
◉ the ___ part of the air brake system tells you how much pressure is
left in the air tanks Answer: supply pressure gauges
◉ the ____ shows you how much air pressure you are applying to the
breaks Answer: application pressure gauge
, ◉ if the air pressure in the tanks falls below ___, the low air pressure
warning will come on. Answer: 60psi
◉ ___ brakes are held back by air pressure and are the mechanical
force which keeps the emergency and parking brakes in place
Answer: spring brakes
◉ in newer vehicles, you engage the parking breaks by using this
knob Answer: diamond-shaped, yellow, push-pull knob
◉ never push the break pedal down when the ___ brakes are on
Answer: spring breaks
◉ the first step to checking the air brakes is to see if the air pressure
drops more than ____ pounds in ___ minute Answer: 3 pounds in 1
minute
◉ the second step to checking the air brakes is to ____ Answer: make
sure the low air pressure warning signals are working
◉ the third step of checking the air brakes is to make sure the
parking brake valve closes at ____psi Answer: 20-40 psi
