A little more involved but, crack ableeder loose and see if the brakes release. If so it's a hydraulic problem.
Get it to do it again, crack the rear line loose at the master. Do brakes release? If so problem it s master or booster related. If not then hose, line or p valve related. Duplicate symptoms and crack line at various places, note the results. This seems to be a good approach. I will try and report back. The proportioning valve is stock and original but the MC is aftermarket...
1970 Superbird 440 Six BBL, 4-Speed, Dana, FJ5
1969 Daytona Charger 440 4-Speed, Dana, EV2
1971 340 Challenger Conv. Flemington Speedway Pace Car, FC7
1970 340 Six Pack Callenger T/A 4-speed T8 Tan
1971 340 Challenger RT Formal Roof, EV2 w/ V2 Stripe & Orange Houndstooth
1969 Talladega Torino, 428CJ
1969 Gurney Special Cyclone Spoiler II, 351 Cleveland
"Id rather have a bottle in front of me than a frontal lobotomy" Ben Franklin 1755
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