19-07-13, 08:04 AM
(18-07-13, 11:05 PM)darrsi link Wrote: "....incompetent drivers giving the bike a nudge when parking...."Well, not really. Cars are heavier than a pram. :rolleyes
[size=1em]Bit random, and as likely as being bent by a pram or shopping trolley!!![/size]
[size=1em]And at the moment there is no real evidence to suggest a new disc is needed at all yet, not until he's done a few tests anyway?[/size]
The OP has measured the disc runout and it's out of spec. Which is evidence.
Generally a sticking piston causes the disc to warp i.e. become dish-shaped, because the force is applied evenly around the disc. When that happens the brakes become very spongy, yet there will probably be no runout. Fizzy's disc is bent, which is more likely to have been caused by external force.