Brake pedal valve

[Coco620]

(09-16-2018 )dhirocz Wrote:  How does it act bobtail vs with a trailer?

Air pressure with the foot brake applied lower when this happens?

You could have a bad chamber backfeeding out the exhaust. For me, it only did it when I was bobtail...my tractor protection valve was at fault.

I also noticed when I started replacing valves the other ones in the circuit started acting up...I said the hell with it and replaced them all.

Also, you aren't using aftermarket valves, are you?

Seems to be the same bobtail, Yes I used an aftermarket valve