I have had the old brake flex lines go bad by closing up internally, they start trapping fluid in the calipers, they let the fluid pass thru when you press the peddle, but restrict the return fluid that is not under the same pressure. It go so bad they would not let any fluid return. And I had to bleed off the pressure to release the brakes. This was on the front disc's only. I would test it by raising the car, have someone repeatedly apply the brakes until they start to lock up, then bleed off the pressure and see if they release.
It the hoses are original I would replace them, cheap and easy. Good luck I hope it is that easy
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Jeff R
60 Jaguar Mark 2, 3.8L Automatic
67 Sprint Firebird 230 OHC-6 4-Speed A/C
1971 Fiat 130 Coupe 3.2L SOHC V6, ZF 5-speed
78 Catlina Safari, Pontiac 400 powered
77 Astre Formula, 215 Buick V-8 T-5
73 Lemans Safari, 400 4bbl 4-speed
71 Catalina Enforcer, 455 4bbl
05 Dodge Magnum 3.5L SOHC V6
06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed!
2012 F-150 Echo Boost (My local Ford Dealer SUX!!!)
2020 Dodge Charger Scat pack (recovered)
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