Air Lines, Springs, and Connectors for Sliding Axle Drive Van

I ran into this recently on my 2017 Great Dane reefer trailer. You can get the bulk hose and fittings that connect the relay valves to the brake chambers at Truck Pro or the like. Cut the hose to the exact length and the fitting is a clamshell contraption that's not too hard to figure out. Same with the hangers and springs, sold at any decent truck parts dealer.

However, the hoses connecting the hard lines to the chassis had oddball sizes and fittings and I ended up getting them from the Great Dane dealer. They were actually priced reasonably, which was a surprise. Less than $70 for the pair if I recall. I did have to pick them up at the warehouse for same day. They weren't in stock at the dealer.

 

That one had developed some leaks at the fittings in sub freezing temps from aged rubber, no doubt. Then like two weeks after changing out the hoses, an air spring decided to start leaking too. I bought my trailers new and all the rubber air parts were the same age, so they all got replaced at the same time. The other trailer is a year newer, and will get done before the snow flies this winter. Probably wouldn't hurt to carry a couple pair of fittings and some hose if it offers some peace of mind. You could either cut the end off an old hose and screw a fitting in the fresh end to buy some time, or just make a whole new hose right there on the spot. None of mine ever failed catastrophically, and took 5+ years to start seeping at the fittings, so I'm not toting spares myself.

The fittings on the hoses to the brake chambers are basically a threaded barb and a 2 piece interlocking collar with a locking sleeve that pushes on over it. You put the collar on the hose end and lock it, put some grease on the barb and twist it into the hose. It compresses the rubber when it goes in to form the seal. The brass piece fits an allen wrench used to thread it into the hose. The fitting kits come with the wrench included.