I have a 2016 Pete 389 that I'm having an issue with.
If you try use the trailer brake spike…it hardly puts any application to the trailer.
We tried it on multiple trailers and it's the same on all… so it's gotta be a truck problem.
There's no audible air leaks when applying the hand valve or foot valve.
I was wondering if it could be a tractor protection valve? Mine is a tp5 style valve and Peterbilt wants over $800 for it….so I don't want to change it for no reason.
Any ideas how…
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