w900 parking brake valve leaking?

chalk your wheels, release your brakes, and clamp off each brake hose with hose clamp pliars one by one until the leak stops

 

It definitely sounds like a brake chamber. If you can hear air at the valve when the brakes are released then you should be able to hear the air leak by doing a walk around. Chock the wheels, shut the engine off (make sure your air tanks are full), release your brakes then slowly walk around the truck and trailer. You should be able to narrow it down pretty quick.

If you have trouble hearing it, have somebody press the brake pedal while you do the walk around.

 

Chock your wheels, If you chalk them like I said to do your truck will still roll, you will just have a multicolor tire!

 

Block the wheels put the trck in gear with the engine off, release the brakes and walk quickly to see whats leaking, prob a chamber.? could be a stuck open valve going to the chamber, mines stuck like that on and off.

 

DO NOT drive until you solve issue .last thing a guy wants is to be in middle of a intersection or tollbooth when brakes dynomite because leak got worse . not to mention out of service if caught by dot