when I worked at a indy shop I had a dual disc setup that drove me crazy. It acted like it had air in the lines no matter what I did. I rebuilt the master, I put new lines on it,I replaced the master cyl. I back bled it like you did. I even tied the handlever with tywraps all night, even repositioned all the parts so there could be no high air spots. Finally I bled it one last time, then pulled the calipers off and stuck a flat bar in between the pads that was thinner than the stock rotors but was strong enough to be able to pry them apart. I pumped the master cyl till the pads held the metal bars tight. Then I pryed the the pistons back in the calipers far enough to easily slip them back on the rotors put everything back together and pumped the master cyl till the pads were in the regular position. Problem solved, good luck.Ya gotta wonder why they locked up in the first place.
Ridin and wrenchin on Milwaukee vibrators since 1971
Posted on Jun 7, 2012, 2:01 PM from IP address 188.8.131.52