Registered Forum User
GTL
Bikes: ST4s ABS
Posts: 480
Join Date: Aug 2003
Location: Tayside, Scotland
If the disc is so badly warped that you can see it I'm surprised you haven't felt a vibration through the pedal.
It's no big deal to change it yourself. Once you've got the wheel out it is only held on by 4 allen screws but these will be loctited in. So make sure you have a good fitting key , preferably of the sort which fits your socket set wrench. It won't hurt to heat the heads gently with a small gas torch before you start. This breaks down the loctite.
When fitting the new disc make sure that the mating surfaces are perfectly clean so that the disc fits with no run-out. Remember to degrease the disc with petrol and always fit new pads with a new disc.
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