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2007 CH Foot valve

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I have a 2007 ch and the trailer seams to be doing most of the stopping. The trailer is older and does not have abs. When bob tailing it seams to stop ok but when hooked up to the trailer I can feel its the trailer doing most of the stopping. My first guess is the foot valve but I'm not positive so I don't want just start changing parts. Thanks for any help.

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We had alot of rear brake problems on some of the last CXN's and CHN's. Something in the rear relay valve/ABS modulator valves was going bad. At the time you could buy all 3 valves assembled together and made for a easy install. All 3 were bolted together on the crossmember in front of the front drive axle like the pic shows. 

Air brake.jpg

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Well that doesn't look cheap! How do I test it to make sure its that and not something else?

 

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