Hot Rods Need Brakeline Advice

Just put Disc Conversion on my 50 Plymouth. The rear axle is a Ford 8.8 Drum setup. Disc calipers are GM. My Plan was to put a proportioning valve onto the back axle and branch off with a pressure valve into each Brake Cylinder. That would be 2 pressure valves, one for each wheel In the Front, go to a tee from the Master cylinder and into each rubber hose line connection. Of Course the Master Cylinder would be a Drum Disc type. Would this approach work, and what size lines should I run? Im looking at 2500lbs of car and 450 HP. As long as I have your attention, maybe you could direct me to a new brake pedal conversion and Power Booster to be mounted on the Firewall, Thanks Fella's and have a nice upcoming Holiday, Stan

 

Your saying 2 pressure valves for the front? You shouldn't need any if your mounting the booster and master on the firewall. But with stock location, a 2lb for the rear brakes and a 10 lb for the front. That's 2 in total.

 

Just 2 pressure valves in Rear Brake line, 1 for each wheel, and a proportioning valve before these connections, None in Front Brake Line

 

2 psi residual pressure valves are for disc, 10 psi for drum. 4 wheel disc would have a single 2 psi to front and one to rear near master with proportioning valve to rear after residual pressure valve.

 

This info from MBM Brake Boosters
http://www.mbmbrakeboosters.com/

DISC BRAKES FRONT AND DRUMS REAR WITH MASTER ON FIREWALL



A disc/drum combination valve (PV2) is the easiest way to properly balance your braking system. The combination valve is two valves in one. It provides metering to the front which prevents nose dive and proportioning to the rear which prevents rear wheel lock up. We also recommend the addition of a 10 lb residual valve (RPV10) to the rear drum brakes.

 

As has been said, one residual valve per master cylinder circuit. 2lb. for disc. 10lb. for drum.

For a firewall mounted setup, you could leave off the front one, but with an under floor setup, it is a must, to prevent drainback.

The line size does not matter.

I know of no ready-made firewall booster/master/pedal system for this car.

You'd have to look for a universal one.