The Nitro Posted March 13, 2022 Share Posted March 13, 2022 I am working on getting my 2004 mack vision tipper ready for rego and I am hearing and seeing air leaking out of the boot on foot brake where it goes through firewall. Its leaking in the cabin side where pedal pushes on the valve. It leaks air when we press brake pedal lightly but seems to stop leaking if we push pedal hard. I can hear a feint leak from engine bay side when I lift little round rubber flap on brake valve but most of the air seems to leak into cab side of valve. it’s my first truck, Is this normal of not? I can’t hear any leaks there except when we push brake pedal. theres 8 ports on valve 4 up and 4 down theres a number on top of valve 5631 thanks Quote Link to comment Share on other sites More sharing options...
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