knott4me:Overtightened? I very much doubt it.In fact,there was no tightening torques quoted anywhere in the magura manual,(2006),it just said “fit the brake according to the manufacturers instructions”.
The brakes I fitted are Hope mono m4,203mm rotor,small amount of blue loctite on the fixing bolts,(standard length bolts supplied with the brake),& just nipped up.
When the cracks appeared,my lbs & I came to the conclusion that the bolts weren’t long enough,i.e.once they had passed through the thickness of the caliper,(direct fit to the post,no adaptor required),there wasn’t sufficient thread length going into the post,so with the braking force trying to rotate the caliper forwards,in efect pulling the post mounts upwards,caused the cracking.
When the forks returned from Magura,longer bolts were fitted,but 4 months later…..cracked again!
Oh,the above was just one example of a long list of problems I suffered with these forks.