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Juddering when slowing down

steelosteelo Posts: 542
edited April 2013 in MTB workshop & tech
Hi all,

As i'm rolling along a trail, if I apply the front brake to slow to a stop as I get down to about 6-7mph the bike begins to judder quite violently. If I maintain the speed (obviously with the brake off) the judder continues.

I want to stop the juddering, any ideas where I can start looking? I've not experienced this with hydraulic discs before but I haven't ridden my bike for a while due to herniating 2 discs in my neck last Feb.

Cheers for any help.
Specialized Rockhopper '07
Trek Fuel EX8 '09


  • nicklousenicklouse Posts: 50,675 Lives Here
    lose headset?
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • BikeSwanBikeSwan Posts: 260
    I had the same issue. It turned out the headset was lose. I tightened the headset and it almost went away, it's not completely gone but it's not as bad as it was.
  • estampidaestampida Posts: 1,008
    check all bolts

    clean the brake disk, and change the pads (pads get contaminated with brake fluid and cannot be saved, chuck em)

    cheap reliable pads from
  • Chunkers1980Chunkers1980 Posts: 8,035
    If that's the case why would the judder continue?
  • cooldadcooldad Posts: 32,599
    estampida wrote:
    (pads get contaminated with brake fluid and cannot be saved, chuck em)
    Where exactly does the brake fluid come from, unless your calipers are fubared?
    I don't do smileys.

    There is no secret ingredient - Kung Fu Panda

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  • pesky_jonespesky_jones Posts: 2,890
    Have you got large holes in the rotor? Sometimes this is the cause.
  • swod1swod1 Posts: 1,639
    Put the front brake on and rock the bike forward/back, any play in the headset you will notice for sure.

    I had this a couple of weeks ago and re tightened the star bolt and stem bolts and the problem went away.
  • steelosteelo Posts: 542
    There was a small amount of play in the headset so its all tightened up now and the juddering appears to have gone. Proper test needed though so if it's still there tomorrow eve then I'll be looking for another solution!

    Specialized Rockhopper '07
    Trek Fuel EX8 '09
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