Vincents comments are interesting and they reminded me of trouble I had on two seperate occasions with my 365 GT4. The brakes would lock on and my mechanic at great cost had the cylinders reconditioned only to find it made no difference. The problem turned out to be the flexible rubber hoses swelling on the inside. This would allow the master cylinder to put the brakes on under pressure but would not allow the fluid to return . Problem solved. The car has Disc Brakes but drums have heavy return springs so blocked hoses may not create the problem you have. Has any one had this problem on a drum brake car, I havnt. Food for thought.
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