When was the last time the brakes were bled?
If you are going to take the wheels off. Try carefully pushing the brake pucks back into the calipers. Try to do this several times.
I used to work with a factory trained Porsche tech who always did this on all four corners at major maintenances, whether brake pads were need or not. He said it cleaned and lubed the pucks.
It might temporarily helped a stuck puck.
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)