A couple of years ago, on the night before a big ride up to Spruce Pine on the Blueridge Pkwy, I was giving the B12 a once over and decided to add new pads. The originals ahd about 23K on them. Pulled the calipers and gave them a spray clean, backed the pistons, and added the pads. I then took a ride on my 2 mile "loop" to check them. The right side was noticeably hot compared to the left. This was before I degassed the pads. I wouldn't have gotten 10 miles. I tossed back the originals as I needed sleep.
When I returned from the trip, I pulled the calipers and removed the pistons for a cleaning. I noticed nothing - very clean. Put it back together with the new pads and the problem was gone. Who knew?
Clean 'em and bleed 'em and you should be OK.
Marc/Atl