Brake system questions

[Useful Idiot]

Greetings all,I have a 1948 Austin Panel Van.Its time to plumb all the brake lines.I know I need a 2 lb RESIDUAL PRESSURE VALVE in the Front brake lines.I know I need a 10lb RPV in the rear line.I have a Standard Brass PV2 Prop valve.Do I need to use an ADJUSTABLE Prop Valve IN PLACE of the Standard PV2 Valve or do I ADD the Adjustable Prop Valve to my brake system and KEEP the standard Brass PV2 prop valve in the system and use BOTH TYPES of Prop Valves TOGETHER in the brake system?Should I put the RPVs in the lines BETWEEN the M/Cyl and the and Prop valves or elsewhere.What can anyone tell me?Thanks

 

[FishFry]

If you have all drums, you need a 10lb residual valve in each line (at least when your MC is under floor) plus a adjustable proportional for the rear.

Frank