Proportioning Valve Question

[Banana]

I have the Power Disk Brakes. Vehicle build April 1970.

Not knowing better at the time, I installed the proportioning valve under the frame rail with the post-January combined unit. So in effect I have 2 proportioning valves.

Brake system works, but after finding out what I'm supposed to have (just the combined unit), I'm concerned I may be compromising the system.

Feedback and recommendations to remove the second proportioning valve please. Thanks

[MoparCarGuy]

The factory service manual is rather confusing on the downstream proportioning valve. Here is the factory TSB introducing the new valve (after January 1, 1970).
Also, the service manual info showing the new Combination (Tee and Metering) Valve AND the downstream Proportioning Valve. The last diagram is one I made so that all of the fitting sizes and input/outputs are identified.

[MoparCarGuy]

Did you test for early rear wheel lockup?
Here is Wilwood's procedure when using an adjustable proportioning valve. Most of it applies even without an adjustable valve.

"For safety and performance, the rear brakes should never lock before the front brakes. Otherwise, an out of control situation could occur.
1. Begin with the valve in the full proportioned (least pressure) position by turning the knob all the way out (counter-clockwise rotation).
2. In a safe location, make several hard stops from 30 MPH observing the function of the rear brakes. If the rear brakes do not lock up before the front, gradually
increase the rear line pressure by rotating the valve clockwise (two turns each time). then you are good-to-go.
3. Continue these adjustments until the maximum amount of rear brake pressure can be achieved, and no wheel rear lock is observed.
4. Test the vehicle again at 50 MPH and make any additional adjustments as needed."

AND Wilwood's generic testing/conditions to know the brakes are working properly.

[Banana]

Amazing info MCG. Thanks very much. Brake system absolutely critical. Probably the #1 safety system (steering might be #2) we have on these classics and they must be restored/built correctly and maintained continuously.

Really appreciate your extensive knowledge and info.