Ill try and keep this simple

had some drilled and grooved front disks and some red stuff pads, disks chewed pads and MOT was due so just replaced for stock disks and pads. MOT passed YAY
Sanded down the red stuff pads (just taking the top layer off) As there was less meat on the red stuff I didnt need to push the piston on the caliper back or anything, but they feel a little spongy now - should they have to be bled to feel like they should?