Well...
My rear brake hasn't been working well over the last few weeks... So I used some Isopropyl alcohol on the disc to clean it, loads of black stuff came off...
So I rode the bike down the street, braked and there is a huge vibration coming from the back... So huge my feet and knees felt numb while braking!
WTF is going on!?
Bike in question...

My Mountain Bike by MilkieKula, on Flickr
180mm Rear Disc, Avid Juicy 7's..
Yes I know, ditch the Juicy's and replace 180mm with 160mm.. 160mm will be going on tonight.. Anymore sensible options!?
BTW I've got to sort this for tomorrow... Going to see Jedi!
...lastminute.com !

