We used to run into this all the time. Here's what works....remove the switch from the proportioning valve. Lay a rag over the hole. From in the car stomp the brake pedal hard. Replace the switch and flush the area around the p valve with water to prevent brake fluid from marring painted surfaces. You may have to bleed after that. This will reset valve.
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1978 Black & Gold T/A [complete 70 Ram Air III (carb to pan) PQ and 12 bolt], fully loaded, deluxe, WS6, T-Top car - 1972 Formula 455HO Ram Air numbers matching Julep Green - 1971 T/A 455, 320 CFM Eheads, RP cam, Doug's headers, Fuel injection, TKX 5 Spd. 12 Bolt 3.73, 4 wheel disc. All A/C cars
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