Hey all 4 of my Brakes are sticking on a little but i can turn the wheel by hand.

This made my new drilled and slotted rotors dark grey colour. I recently did a brake job and checked & greased the slider pins which also were reasonably free moving,i was also able to squeeze the pistons all the way back into the calipers to fit in the new pads.
I did notice the slider with the plastic tip on it was much more difficult to push in,so i was considering changing all slider pins and cleaning out the holes on the calipers. Or is my problem somewhere else?

My last set were the same dull color,i thought normal because they are old and the fronts were warped. Really don't want to ruin $700 of brake parts premature.

 

I never squeeze the old brake fluid back into the caliper. It's the most worn/heated fluid in your system.
Try bleeding all four brakes, removing enough to eliminate most of the Old fluid near the calipers.
This might relieve some caliper pressure when pedal isn't depressed.

 

Thanks will try that !

 

Grey coloration of the rotors is normal. It's the development of a light transfer layer of friction material onto the surface in order to develop full braking effectiveness.