Join Date: Feb 2002
Location: Monroe, Connecticut
I will assume that the PB system that you have is stock. Meaning that the PRO VALVE is GM issue. I had the same problem. You will have to get a small C-clamp and clamp down the little "nub" on the back side of the PRO valve. This will release the ball bearing inside the PRO valve thus, letting you bleed the air out. I was confused at the time also since the "nub" on the back of the PRO valve looks to be casted into the piece and not a moveable part. But, it works. Let me know if you want pics. Hope this helps.
1969, X-44, Export Model, Hugger Orange, Std. Int., BC Rear(soon to be a BT 12 bolt), PDB, GMPP 350HO, M22 Supercase, SSM Lift Bars, AirGap, Holley 750, FlowMaster American Thunder Exhaust, FlowTech Headers