I've mentioned this before some time back. I installed aftermarket levers and thought they were the problem. Should of checked alot sooner but I completely removed the brake lever and the front wheel dragged the same. I'm asking what should my next step be. Brake's? Right
Nothing really pulls the caliper piston back into place. The rubbers seals are about all there is. If they are really dirty it can contribute to their not returning as much as they should.
The pad never really leaves the disc surface. How much is yours dragging? Will your wheel spin around 3-4 times or 1/2 rotation?
Also if your wheel is not installed, perfectly it can cause one side to drag more than the other. It might be slightly bound up. I would test one caliper at a time and see if one drags more than the other. At that point you'll have better information to decide if you want to rebuild your calipers.
It might be as simple as your brake fluid is overfilled causing unnecessary pressure, or your caliper pistons not moving properly.
Possible that your rotors are warped but unlikely unless your rotors is no longer "floating" i.e the bobbins are seized which in that case would just need to be cleaned.
Try cleaning your brake caliper and do a thorough flush.
It will spin maybe 1 rotation. I removed the calipers they didn't look dirty. I was able to move the pistion back in on both then reinstalled them applied the brake lever a few times. I'm back to the same way
Before you blame the brakes, it would be a good idea to go through the steps, on the video. You can have a perfect brake system, but if the front wheel is not just where it should be, you can get drag. This video is excellent, and it shows just how to do this.
If it still drags, after the video steps, go from there.