TheSDTrucker Posted October 26, 2018 Share Posted October 26, 2018 I crawled under a trailer today to get an idea of what the air line plumbing looks like on a trailer. I am having trouble distinguishing which line does what. I noticed there are two different sizes. Which one would be the hose for the red gladhand and which one would be for the blue gladhand? Quote Link to comment Share on other sites More sharing options...
dad vader Posted November 16, 2018 Share Posted November 16, 2018 The smaller hose(usually 3/8 inch nylon hose) is for the spring/parking brake system. The larger hose(usually 1/2 inch) is for the service side They both go to some kind of relay valve which applies tank air to the systems. Quote Link to comment Share on other sites More sharing options...
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