[Closed] Front end juddering under braking.....forks service?

Warped/bent disc rotor? Seems more likely than a fork problem to me.

What forks, discs,brakes?

I had the same issue, super light rotors with big cut-outs?

I had similar with worn pads on deore brakes mixed with avid rotors. When the pads wore down enough they touched on the outer edge of the wavy rotor due to a slight overhang.

I had aztec wavy rotors and it destroyed my revs.

Fox floats and slx brakes and discs. Have checked the pads and there is plenty of pad left however they have been on for ages! I means ages which seems a little odd!

contaminated pads and disk possibly

I had this occur and it turned out that the calliper was not far enough out so pads were catching on rotor arm.

Some washers to move calliper further out sorted this out.

HTH

I had this with a ashima rotor. I only run round pizza discs on the front now.

Is your headset tight?

Put the front brake on and rock the bike. Hold onto the caliper, stanchions, headset. See if you can feel any movement

Headset definitely tight. Will have a go at changing the pads and giving the rotors a clean and see of that helps much. Will probably get the forks serviced anyway as I've done a fair few miles without changing the seals or anything and they feel quite sticky.

if its a full suss, it could be your bushes on rear shock. it may feel like its coming from the front end, but that could be a cause of it.

Its pretty common and well documented on fox 32's. I never noticed it until I got some 34's. I have 3 bikes with fox 32's. One 2009 set with a quick release on a lightweight xc bike with 100mm travel, these are the worst and do it all the time. I have a quick release set of 2009 120mm travel and they only do it when coming to a long slow stop. The 140mm 2014's with a 15mm maxle I have don't do it at all.
Its not something I notice when riding and if I do its soon forgotten. Just carry on riding.
Or if it bothers you that much and currently have a quick release and an adaptable hub you may be able to fit a bolt through axle like a dt swiss rws.

If your forks need a service then send them away anyway and see if that fixes it once it's back? I have some Fox 32s which I thought were a bit juddery. Turned out it was the headset, but Mojo were kind enough to replace the upper assembly under warranty.

My £5 is on the headset.

Loosen and reset it, then rock-check it at 90 degrees as well as fore-aft.

Turned out it was the headset, but Mojo were kind enough to replace the upper assembly under warranty

and unless your stanchions are (quite visibly) shagged then surely it's the bushings in the [i]lowers[/i] that would cause fork judder...?

As almost everyone has already said it is most likely a brake issue rather than the forks. Partially rotor warping, partially the pads catching on odd parts of the rotor when worn as far as I could tell.

I had this with XTR brakes and Ashima rotors (Magura Durin Forks). New pads and better quality Hope rotors have completely remedied the issue. It seems the cheapy, light rotors work well for a while then go all juddery.

so mojo replaced a perfectly good set of uppers? Sure there wasn't a problem you hadn't noticed that they fixed while they had it?

Nothing I noticed. However, the work note it came back with said they'd replaced the steerer unit. It had different decals on it too. Performance was much better and I've not noticed any problems since.

I do agree that it's probably the brakes in this case.

I run Ashima airotors on one of my bikes and whilst it causes a pulse in the lever it doesn't cause the forks to visibly judder.

so mojo replaced a perfectly good set of uppers?

Why not, done under warranty Fox pick up the tab, it's not like anyones going to argue about it?

Only time I have had this was due to inconsistency of wear on brake pads (not sure why - one different batch maybe)

Swapped my pads from the back and the judder stopped, left them on the back till they wore out.

Check your disc rotor is fastened on tight, I had similar juddering and turned out that the locking on my centrelock disc needed nipping up, id imagine that slightly loose bolts on a 6 bolt rotor would have the same effect.