[ollykiwi3]

right oh, time for the guys who work in the braking industry to chime in..
I have skimmed the stub axle, skimmed the disc, skimmed the disc mount flange face and put it all together. went for a cruise, still have the same problem. bled the hell out of the system, but still no improvement.
put it up on stands and ran it while underneath.
slight movement of rotors, but both about the same.
the only thing i can see thats different, is AFTER applying brakes, one caliper piston(one piston on one caliper) seems to retract slightly further than the opposing one after releasing the pedal. if i grab the pad and move it, its easier to move than the opposing one, meaning it is further away from the disc than the other.
If i grab the pads on the other caliper they are harder to move(havent retracted very far)
I think whats happening is with a little trailing brake(approaching stop sign etc), one pad is not doing quite as much as the other, which tends to make it skim on the rotor a little, causing the vibration.

If i push on the pedal, i can go through the vibe.

If a piston has air in it, would it retract more or less??
What about a rolled seal??

thanks
All the pistons and seals are new. what could cause a piston to retract more.