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<blockquote data-quote="barnyard" data-source="post: 2359186" data-attributes="member: 13921"><p>I have the tractor brake set and the hand valve down. When I walk around the trailer, I open both valves on the back of the trailer. If there is no air, there will not be air for the rear of the set. Having the hand valve down also activates the brake lights, so that I can see that on a pretrip.</p><p></p><p>If there was air when I was pretripping the front and there is not at the back box of a set, I know that either the dolly or the back box is defective.</p><p></p><p>I do the same on a post trip. With the hand valve down, the brake lights are on. I also check the air on the rear box on the post trip. Just a quick turn on and off, not even the whole way, just enough to hear the air.</p><p></p><p>If you do not have the hand valve down, there is no way to check that.</p></blockquote><p></p>
[QUOTE="barnyard, post: 2359186, member: 13921"] I have the tractor brake set and the hand valve down. When I walk around the trailer, I open both valves on the back of the trailer. If there is no air, there will not be air for the rear of the set. Having the hand valve down also activates the brake lights, so that I can see that on a pretrip. If there was air when I was pretripping the front and there is not at the back box of a set, I know that either the dolly or the back box is defective. I do the same on a post trip. With the hand valve down, the brake lights are on. I also check the air on the rear box on the post trip. Just a quick turn on and off, not even the whole way, just enough to hear the air. If you do not have the hand valve down, there is no way to check that. [/QUOTE]
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