I received the (Hawk) pads from Porterfield within a couple days. I decided to start with the LF that was grinding. I removed the bridge and the inner pad was worn down whereas the outer was about 5/16" thick. I removed the pads and noticed the grooves in the calipers where the pads sit were especially gunked up on the inners. Brake cleaner and some brushing and scraping and caliper grease were used. I moved the old outer pad to the inner and installed a new pad on the outer. Not my preferred long term situation but I wanted to drive a couple days to see how my cleaning affects the brake function. Immediately I noticed an improvement and no chattering. I plan on having the rotors turned in a couple days and replace the rest of the pads and inspect the LF inner pad.

__________________
2001 x5 3.0 (sold with broken motor), 1990 e30 M3, 1991 318is, 2002 325i, 2008 335i Dinan stage 3 6 speed,