Bendix brake valve question

[Hammerhead]

(08-29-2016 )Rawze Wrote:  

(08-29-2016 )PuroCumminsPower Wrote:  I replaced the Bendix E8P brake valve on my 09 PROSTAR it would leak from where air comes out after you release brake. The new one is still leaking. I read that it can be caused by other parts putting pressure into brake valve. Anybody ever have this problem?

The parking brake chambers can leak air into the service brake lines and vice versa,... I would start there.

This was my first thought as well. With your wheels chocked to prevent the truck from rolling, release the parking brakes. With the truck shut off so it's quiet, crawl under the truck and listen for air movement. If you can't hear a small leak, one at a time remove the service line from each brake pot. You probably have one with an internal leak allowing air from the charged parking brake side into the service side, which escapes out of the released valve.