1967 Ford Mustang Repair Question
on your model with the stock system it doesn't have a low brake pressure warning.Your original proportioning valve will only put hte light on to tell you there has been a failure on one side of the system. it sounds about right for what you are doing, but if i remember correctly there is also a metering vlaveprior to the calipers. Just make sure you use the correct master cylinder as there is a pressure valve for the rear brakes. Run the brake lines from the master to the proportioningvalve correctly as well. In the master cylinder one side is for front and other for rear. the drum brake has a small valve that NEEDS to be there as drum brakes ahave pressure on them all the time so they will work correctly. So don't go by bowl frontor rear. You have to find the bowl that has a check valve init.
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