Practice question

If trailer ABS malfunctions, what remains true?

Fifth wheel unlocks
Brake checks are unnecessary
Regular brakes still work, but ABS needs service
The trailer has no brakes

Answer: C — Regular brakes still work, but ABS needs service

The correct answer is shown above. Try the full quiz for additional practice.

Practice more: Iowa CDL Combination Vehicles Test Practice Questions - Iowa Commercial Driver License Combination Vehicles Test Exam →