I had to replace the rear brake line on my xx brake since I got a new frame and the hose routing was different. I did this then gave the brake a bleed. First time I have bled a disc brake but I think I am somewhat mechanically inclined and can read directions but I know how tricky this procedure can be sometimes. Anyway, finished with the bleed and put new pads in. Put wheel back in frame then centered the caliper on the rotor and tightened. I lightly squeeze the lever till it engages the rotor. Brake action seems to feel good and strong when I pull hard on the lever. The only problem is that the rotor is rubbing a fair amount. I know they are new pads but they should not be stopping the wheel after 3-4 revolutions. HELP. What should I do next? Bleed again? I took the pads out and pushed the pistons back in with a box end wrench and tried again but it is the same thing. I have read on the forum about centering the pistons but I am not sure how to do this or what this means. Do you think there is too much oil in the system? ANY HELP would be great. Thanks in advance.