Proportioning valve question for disc brake conversion

French demon said

Is the Chrysler original proportioning valve ajustable?
It seems to me that my rear brakes lock before my front disks.

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Are you sure you have a proportioning valve and not a distribution block? If you have a proportioning valve they are rebuildable. Here is where to get the kit

1970 - 1976 Mopar Combination Brake Valve Seal Kit | Muscle Car Research LLC