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Any ideas?
Might be the fork deflecting. Or it might be the somewhat basic TRP rotor. Try a different rotor to see if that changes things.
Also might be poorly bedded in. But that's usually accompanied with a honking noise...
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I had a very similar problem with a HY/RD and found that the pads were contacting the arms of the rotor. Switching from a svelt Shimano to a more agricultural 6-bolt TRP rotor made a world of difference. I expect a washer or two under the mount might also do the trick.
Howard
mr_tom
@lemonade
So recently I fitted a Surly Disc Trucker fork and TRP Hy Rd to my Pompino. It works reasonably well, apart from under hard braking there is a nasty shaking/juddering/clattering that feels and sounds totally wrong. It sounds/feels like something is shaking back and forth several times per wheel rotation - but only happens under hard braking and it stops when you ease off. I've tried recentering the brake, tightening all the bolts, adjusting the headset, and using a better QR but it won't go away.
I took it to a good bike shop this morning, who said it's to be expected using a powerful brake on a thin steel fork. I'm very doubtful about that though.
Any ideas?