🔗Arizona Combination Vehicles — Question 1 of 10
Why should you lock the tractor glad hands to each other (or dummy couplers) when you are not towing a trailer?
Answer: A
It will keep dirt or water out of the lines.
Locking the tractor glad hands with each other when not pulling a trailer is the best way to avoid contamination from getting to the coupler and air supply system.
Source: Arizona CDL Manual
All choices
- AIt will keep dirt or water out of the lines.
- BIf you did not, you could never build system pressure.
- CThe connected brake circuit becomes a backup air tank.
Arizona CDL Combination Vehicles Test Info
Questions on Exam
20
Passing Score
80%
Time Limit
Typically 30 minutes; varies by testing location
Age Requirements
Intrastate: 18+ · Interstate: 21+
Arizona MVD
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More CDL Combination Vehicles Practice Questions
- Glad hands are usually connecting which of these?
- After connecting the air lines but before backing under the trailer you should:
- The crack-the-whip effect is related to:
- Sudden turns or aggressive braking will have the greatest effect on which trailer?
- Which task is NOT performed during the tractor protection valve test?