My 2p worth.
Firstly, greasing the pad retaining pin will have absolutely zero effect. The retaining pin on the calipers as used on all 749 & 999 does not directly affect the pads, the pin only keeps the sprung pad retainer in place.
Secondly, I know someone that this front brake locking has happened to. Unfortunately he wasn't so lucky, happened on track, front locked solid and spat him off at 80 + mph! The cause was something to do with a tiny little grub screw on the lever. It had either come out or worked loose and backed out/in, whatever, the result was as above. I think you have to remove the lever to find it.
Don't have a 749/999 master in front of me so can't give any more details I'm afraid and it doesn't seem to be listed as a seperate part in the Duc parts book.
So, guys, check your levers!
Neil.
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