front wheel slewing under braking - thoughts?

shefbiker
shefbiker Posts: 255
edited September 2009 in MTB workshop & tech
Hi
I've got a rigid alloy front fork with disks which, following a good crash, has a slight dent about the size of a thumb print on the inside of the left hand leg which has the disk mount on it.

Basically, under braking the wheel slews slightly to the left, and i've noticed that it's the left hand end of the QR moving slightly downwards on the drop-out surface. It doesn't matter how hard i do the QR, or which make of QR i use, it still happens. The QR remains tight throughout, but when I release it, the forks drop back onto the QR proving that the QR has slipped.

My theory is that the fork leg is actually ever so slightly bent (although you can't actually see it), and hence the drop-out surface will be slightly out of alignment. The force on the QR from the disks is massive, and hence the movement.

Does that sound feasible/probable? The only solution seems to be new forks...

Thanks

Tim

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