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14 votes
14 votes
You are driving a combination vehicle when the service air line develops a leak. what do you expect to happen?

User Eoriu
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1 Answer

13 votes
13 votes

Answer:

You expect the trailer brakes to come on and:

A The tractor protection valve to close.

You expect the trailer brakes to come on and: A The tractor protection valve to close. The pressure loss could be caused by a trailer breaking loose, thus tearing apart the emergency air hose. Or it could be caused by a hose, metal tubing, or other part breaking, letting the air out.

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User Pragnesh Vaghela
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