Lubricate Loaded Calipers? Brakes dragging intermittently
So should the pad that sits against the piston should just slide freely inside the caliper without and lubrication? It certainly doesn't move freely so perhaps I do need to file down the edges....I thought some silicon brake grease might get me there as well. I'll try to figure out how to get that outer pad locked down by bending the tab. I really don't think my clearance between my booster push rod and MC is off because it's not locking up consistently.
This is my own opinion, so take it with a grain of salt if you wish.
Filing so the pad floats freely is going to make little difference unless it's literally jammed in there so tight you need to hit with something to get it out.
Just think about the forces involved here.
A sticky pad isn't going to be able to make any noticeable difference at all when you figure that it takes hundreds of pounds of pressure on those pads to stop the rotor.
(It's not like they have to travel to release, but just that the pressure is released)
I actually prefer that they are semi tight in the caliper so they don't rattle over bumps when not in use.
You are going to be looking for a part that jambs (like a caliper piston) or fluid not returning and letting the pressure off.
It could be the rod as suggested above, but if it is the rod it would have to be so close to releasing that the pedal bouncing back (sometimes) allows the piston in the master to clear the return port.
Again, all of the above is just my opinion from decades of professional and personal experience.