After driving for about 30 minutes,my rear brakes start tightening up and eventually lock up.The pedal gets hard.Once they sit for about an hour,they will free up.I've replaced the mastercylinder,checked the wheel cylinders,replaced the rubber lines and unadjusted the brakes. The only thing left are the metal lines,which are original,but look in good shape from the outside.Has anyone had this problem ?
Thanks,
Tom
