I have a 1993 Barth 25' Regal with a 7.4 gas and a P32 chassis that has the RPO code JF9 Braking system Including Hydro boost. I have a leaking control valve I believe is the emergency brake control valve. all I can find that looks like it online is a GM 15654261  -  Valve Asm - Park Brake which converts to a Bendix 106479 But that says "air brake systems" Any Guru's out there that has info or knows a thread on this?

Good morning morning, if memory serves the J9 brake system uses a pump mounted on the firewall with the other hardware down below. Before changing any parts remove any covers to expose the parts. Spray everything with a good cleaner and wash it off. After it’s dry have someone work the shifter from park to reverse, the engine does not need to be running, it is standalone system. Determine where the leak is coming from. The pressure switches in these systems are leakers when they fail so rule that out first. I have never had to replace that valve but there’s always a first time. The valve internals should be easily resealed by disassembling and replacing the o-rings barring any unlikely wear on the spool valve itself. Good luck

Update - The auto/hand control valve GM15654261 checked by the vin # is obsolete. some sites say that the Bendix #106479 is the same but it is not as per Bendix because of the mounting holes. According to Bendix the Proper part is #065416 @ $332.91 from my local Heavy truck parts center. I will be finding out later.

Billyt53 is the pressure switch on the control valve?

Upon furthger inspection I found the leak was from a blown out seal/gasket at the bottom of the unit. Now I wait for the new part to get here.

Upon closer inspection I found a seal blown out at a cover nut on the bottom of the unit. Now I wait for the new part to get here.