CDL Air Brake Exam 2025 Questions
and Answers
Modern air brake systems combines three different systems. - --CORRECT
ANSWER--service brakes, parking brakes, and emergency brakes
Oil and water usually collect in compressed air tanks. If you do not have an
automatic tank drain, when should you drain the air tanks? - --CORRECT
ANSWER--After every working day.
Why drain water from the compressed air tanks? - --CORRECT ANSWER--Water
can freeze in cold weather and cause brake failure.
Air brake equipped vehicles must have: - --CORRECT ANSWER--A supply
pressure gauge.
What can legally hold a parking or emergency brake in position for a truck, truck
tractor or bus? - --CORRECT ANSWER--Spring pressure
Air loss in a straight truck or bus should not be more than ____ with the engine
off and the brakes on. - --CORRECT ANSWER--3 psi in one minute
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1
and Answers
Modern air brake systems combines three different systems. - --CORRECT
ANSWER--service brakes, parking brakes, and emergency brakes
Oil and water usually collect in compressed air tanks. If you do not have an
automatic tank drain, when should you drain the air tanks? - --CORRECT
ANSWER--After every working day.
Why drain water from the compressed air tanks? - --CORRECT ANSWER--Water
can freeze in cold weather and cause brake failure.
Air brake equipped vehicles must have: - --CORRECT ANSWER--A supply
pressure gauge.
What can legally hold a parking or emergency brake in position for a truck, truck
tractor or bus? - --CORRECT ANSWER--Spring pressure
Air loss in a straight truck or bus should not be more than ____ with the engine
off and the brakes on. - --CORRECT ANSWER--3 psi in one minute
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1
