I replaced the pads in my XTR brakes, put in what I took out which were J04C Shimano metal pads. Cleaned up everything with isopropyl alcohol, including a wipe down of the rotor and pads. Did a little bedding in and off to the trails. They were fine for the first 1 or 2 rides, since then they howl like crazy when applied. I blamed it on the humidity, but I'm realizing that isn't really the case. Any ideas on how I can quiet these things down? I've read about people baking them to remove contaminants, sanding them, soaking them in brake clean etc. I've checked the caliper alignment and just this afternoon sanded them lightly and cleaned them up AGAIN. This only happens with the front brakes, the rears are perfectly silent. What's my next step to quiet them down???? The good part is that every hiker I've approached hears me coming and every wild animal in the woods runs away as I approach. The bad is they are annoying both to me and anybody I'm riding with. Stopping power seems fine.