front wheel judder/shudder

and no, it's not a new bike-dance before you ask
front end seems to shudder/vibrate real badly when I apply the front brake on the XC bike - wheel/axle seems fine/tight, callipers/pads are fine, headset seems ok.... any ideas?
I reckon that bike is wrecked, all them fancy red bits have caused catastrophic judder/shudder on the front end, find the nearest goober and sell it to him quickly.....

Did you make sure the disc is tight on the hub??
thanks lads, but I think Damo is right, the red stuff has wrecked it - I thrown it in the skip
Is the shudder like

"da,da,da,dada,dada,dada,dada,dada,da"

or

"der,da,dah,der,da,dah,der,da,dah,der,da,dah,der,d a,dah,.."

Very different problems, but a good set of ear muffs will cure both.

I had a odd noise trailbuilding on Sunday...

"da da, da da, da dadadadadadaddada, boom!", but I think it was the old ticker.
Have you checked your arms ?? it might be your arms.... have you checked them ?


Grease your front disc.... do it, then tell me the problem isn't solved
Bushings ?

I had that kind of problem with a Stumpjumper Fergal. After scratching my head for a couple of days I eventually tracked problem down to a little wear and movement in my rear shock bushing.
It make the bike feel like the Head set is loose.
No chance its the anti lock braking kicking in ? Have you accidentally turned on the traction control :-)
Any chance the frame is Cracked? Stan had some howling brakes at the Mega, and after chaning pads/disc and going through everything else, he found a crack at the brake mount.
oh nice one Darragh - like thanks a lot man, putting the willies up me that my bike is cracked just days before the XC Nationals - yeah well nice try, but you're not gonna faze me, you'll need to try a lot harder than that, and if even hear a hint of someone mumbling "cracked frame" on the start line - well....can-opener and a can o' whupass.....say no more ;-)
That howling wasn't Stan's brakes it was his breathing. And infinitely preferable to a doomed hissing sound... ;-)