Missouri CDL Practice Test: Class A - Test 7 2026
Based on
2026 MO CDL Handbook
Instruction: When applying for this license, applicants must pass a 50-question test. And applicants must score 80% to pass the test. The following questions are based on the details provided in the MO CDL Handbook. Endorsements that may be used with a Class A CDL include Hazardous Materials, Passenger, Double and Triples, HazMat and Tanker, Air Brakes and School bus. If you need additional information, please contact your local DMV office. You can find your nearest DMV office at Missouri DOR locations.
4. To test the trailer emergency brakes you need to first ______.
A
Push in the trailer air supply control.
B
Charge the trailer air brake system.
C
Pull gently on the trailer with the tractor.
D
Pull harshly on the trailer.