Load sensing proprtioning valve

[atsrmf]

I have a 1987 Gulfstream 27' El Capitan. I bought it recently, and discovered that the load sensing proportioning valve has been disabled and does not function. I am getting no brake fluid pressure past the valve, but have it up to the valve. The driveline is a Ford 460 with a C-6 automatic.
Is this valve serviceable? Does anyone have a diagram of one in service? It seems the actuating lever is missing. I am tempted to put a manual valve in with a knob that adjusts the pressure versus the load sensing feature. My guess is this valve isn't available anymore. Any help would be appreciated.

[atsrmf]

I ended up buying a new valve, I found one on EBay. The part is no longer available, and this was the only one I could find. I paid dearly, but what price can you put on good brakes? I still need the linkage, does anyone know of a motorhome junkyard or know someone who sells used parts? The linkage is much more simple that the valve.

[Executive45]

Personally, I wouldn't replace it with a manual one. Messing with the brake system could have dire consequences for you and others on the road. There was a reason the mfg designed your system that way. Your coach isn't so old that replacement parts can't be found. Google is your friend. If not, visit a reputable brake shop and ask them....Dennis

[Jim]

Is this part of the braking system? If so, there's a long history of manufacturers molding a casting number into the part when it's a brake part. Where your missing actuating lever was might have been previously attached to one of those parts.

So look for a casting number, than google it.

[MountainAir05]

Autozone list some. My 99 does not have it.