wolfman wrote:[ So I could pull the valve on the front system and retain it on the rears and see how it goes. Or should I remove both if I fit a proportioning valve on the rear,any recomendations on the best place to get one.
The residual pressure valves and the proportioning valve are two different matters. Totally unrelated.
The proportioning valve (and, as Dave said, an adjustable kind is the only way to go - OEM valves were the same part number for Darts and C-Bodies!) will enable you to limit the pressure transmitted to the rear brakes.
What this means is that it will help you avoid the lightning-fast 180° turn when you hit the brakes in an emergency under the rain.
Once you have fitted an adjustable proportioning valve, find a nice empty place qhere you can do emergency stops without hitting anything, impeding traffic or getting a ticket.
Proceed to do emergency stops from 40+ mph.
If the rear wheels lock up before the front ones, add a few turns to the proportiong valve screw (screwing in).
If it's not easy to guess which wheels lock first, you may need a friend standing by and looking at your car from the outside.
Your aim is to set it so the front wheels lock up just before the rears do.
Ideally, you could do that right after some rain, since a wet ground is the worst case (or do it on dry ground and add a few turns - I did it, I hate rain).
Once this is done properly, even under heavy rain, if you mash the brakes (or if you install a monster hydraulic brake booster like I did), the car will skid but stay straight. You will still need fresh pants
, but no bodywork.