So this is how I did the repairs, just so if any one should have problems with brake lines connecting to the PV, the fitting could be seized in the valve & removing could cause thread damage. You need a 6 point 10mm line wrench. Unable to find one, I picked up a 6pt 10mm wrench & sawed a 1/4" section from the round end, just enough to slip over the brake line. This tool is essential. All brake lines were disconnected from the valve, the valve removed & all threads inspected & damaged threads repaired with a tap. From my experience, once a section of brake line is punctured due to rust, all brake lines must be replaced. The 2 rear from side to side, the 2 lines that run from front to rear, & the section that connects PV to front hose. Replacing the rear brake I found one of the cylinders leaking. Unable to find the part I purchased a comparable unit, removed the old seals & replaced with new ones. I cleaned the inside of the cylinder & used fine (400-800) sandpaper to polish. We have to be inventive now, as parts are being discontinued, becoming more & more difficult to find. Oh yes, make sure your hand brake is working properly & the brake line is in good shape. It has saved me more than once.