DMV CDL Test
2026–2027
Commercial Driver’s License Practice Questions &
Verified Answers | Comprehensive CDL Written
Exam
, You should know that brakes are fading when: You have to push harder on the brake pedal to control your speed on a down grade.
The brake system that applies the use of the brakes when Service brake system.
the driver uses the brake is the:
The air compressor governor controls: When air is pumped into the air tanks.
If your truck's air compressor has its own oil supply. When Before driving.
should you first check its oil level?
For air brake systems in good conditions the air 100 psi
compressor should start pumping at about:
If your vehicle has an alcohol evaporator, it is there to: Reduce the risk of ice in air brake valves in cold weather.
Some air brake systems have an alcohol evaporator. What Ice will form in the storage tanks and cause the brakes to fail.
will happen if you don't keep the unit filled with alcohol?
The safety valve is set automatically to reduce pressure at: 150 psi
The brake pedal in an air brake system: Controls the air pressure applied to put on the brakes.
Repeatedly presssing and releasing (fanning) the brake The loss of air pressure.
pedal may result in:
The most common type of foundation brake found on S-cam drum.
heavy vehicle is the:
S-cam: Forces the brakes shoes against the inside of the brake drum.
When the brakes are applied the brake shoes or linings Brake drums or disc.
are pressed against the:
All air brake equipped vehicles have: A supply pressure gauge.
The application pressure gauge shows how much air Are applying to the brakes.
pressure you:
2026–2027
Commercial Driver’s License Practice Questions &
Verified Answers | Comprehensive CDL Written
Exam
, You should know that brakes are fading when: You have to push harder on the brake pedal to control your speed on a down grade.
The brake system that applies the use of the brakes when Service brake system.
the driver uses the brake is the:
The air compressor governor controls: When air is pumped into the air tanks.
If your truck's air compressor has its own oil supply. When Before driving.
should you first check its oil level?
For air brake systems in good conditions the air 100 psi
compressor should start pumping at about:
If your vehicle has an alcohol evaporator, it is there to: Reduce the risk of ice in air brake valves in cold weather.
Some air brake systems have an alcohol evaporator. What Ice will form in the storage tanks and cause the brakes to fail.
will happen if you don't keep the unit filled with alcohol?
The safety valve is set automatically to reduce pressure at: 150 psi
The brake pedal in an air brake system: Controls the air pressure applied to put on the brakes.
Repeatedly presssing and releasing (fanning) the brake The loss of air pressure.
pedal may result in:
The most common type of foundation brake found on S-cam drum.
heavy vehicle is the:
S-cam: Forces the brakes shoes against the inside of the brake drum.
When the brakes are applied the brake shoes or linings Brake drums or disc.
are pressed against the:
All air brake equipped vehicles have: A supply pressure gauge.
The application pressure gauge shows how much air Are applying to the brakes.
pressure you:
