Proportioning valve location

Better than what we found on my son's 'Cuda last week.... someone previously had used a single MC distribution block and rear prop valve......That combines the front and rear MC halves into 1 system, and then pressure relieves the whole system with the prop valve!#-o

That will be addressed after the initial break-in while setting in the garage....

For the OP:
- Make sure the front brakes are fully bled especially at the MC, and so that you are not being fooled.
- When you put that prop valve in the rear system, it can be a bit touchy and take a number of tries to get it set right so put it in a place where you can easily get to it. Especially if you have a large front to rear mismatch in braking power. The fender well area is a great spot; just plumb in some extra line IMO, and keep it below the MC.
- Be aware that the setting of the prop valve will produce good balance around one range of brake pedal pressures. For example, if you reduce the rears too much at light pedal pressures, the fronts will tend to lock under heavy pedal pressures; not good in the wet. If the front to rear mismatch is too much, you'll never get the balance good over a range of pedal pressures with a prop valve.

At that point, some remedial work is needed, like smaller or narrower rear drums, or better, yet, smaller rear wheel cylinders like AJ used, or use front brake pads with a higher coefficient of friction. Getting the brake balance close to begin with is the best solution. I don't use these prop valves anymore if I can help it, for this very reason.