Rear brake pistons sticking?

[4everFJ]

ALL disc brake caliper seals have that taper. 

Nope, that is not the case. The ones in my FZR calipers are square.

[racerrad8]

Here is a new set for the stock FJ caliper.

Robert

[CutterBill]

ALL disc brake caliper seals have that taper. 

Ignore that comment.  It was made by my evil twin.   

Honestly, I must have been thinking of something else, but for the life of me, don't know what that could be.  Senility setting in...
Bill

[wirehairs]

So, I replaced the rear M/C piston with the original one, and all is good and braking is fine.  Since the original rubber pieces were in good condition, I didn't want to wait for a proper rebuild kit from RPM.  I'll do it over the long winter here. 

But here's the problem: my front pads are still dragging a bit on my disks.  I've moved a LOT of fluid through the new lines and have taken a few 2 mile rides and then bled some more, hoping to dislodge some last bubbles or something, but they are still dragging.  I can move the wheel with my hand with little force, but I don't feel they should be dragging at all.  Again, all new M/C kit and all new caliper seals on those front brakes.  Happy to make a video if needed.

Thoughts and solutions? 

[Pat Conlon]

With my HH pads on R-1 calipers, a tiny bit of drag is common. I can hear a hiss as I spin the front wheel.