RTman10 wrote:
Just a small point. Did you use new securing bolts. BMW state they are one time use only.
No I re-used the bolts that where there as they had recently been changed by BMW when the recall on the rear hub was done.
They are supposed to have a small amount of thread lock on and this why it's recomended that you gently heat each one prior to undoing them to try and release the thread lock but these seemed to have none on them for some reason ?
So I just cleaned them up with some wire wool, put a dab of medium thread lock on each then fitted using the two stage torque method as recomended.
As for the "Wavy Style", Yes they are indeed but if you look at the actual friction material, not the pad itself, theres actually very little in it so to speak interms of lost contact.
I've had the Wavy Disks on a few bikes, granted I've never used the Viper disk before but as a design, yes it's a bit of gimmick and visually it adds something a little different but I've never noticed any negative effect in the braking. In fact you always tend to have a better feel through the lever as your running on a fresh faced disk rather than something that has thinned and become scored or slightly distorted.
I replaced mine as it was measured at 4.35mm and the minimum recomended by BMW is 4.5mm. Mine had also become quite scored so there was a noticeable improvement once changed.
At point of change it was on the original disk with the bike having covered just over 38k which isnt too bad.
Replacement Rear Disk & Pads.