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It's in post #12 above. Haldex RN31BC

http://www.ryderfleetproducts.com/haldex-midland-rn31bc/repair-kit-for-tractor-protection-valve-p-u55-rn31bc

My leak was when the brakes were being held, like at a traffic light. You could hear the air venting over the running truck and watch the air gauge drop.

Sorry about those 2 random sideways pictures.

The wife was driving Shrek this weekend with yours truly riding shotgun (a normal scenario). We noticed that the air was bleeding down pretty fast at long traffic lights as the brakes were held, so I had a look when we got home. I found that air was venting pretty heavily out of the front...