Front end judder

[Bob Andrew]

Yes Chief, noticed after came back from 700mile ride out over 3days up north, lots of single track miles and varying weather conditions hot, cold,wet,hail.
Contacted dealer y'day and Triumph have declined cos the run out figures weren't sent, so Triumph Glasgow sending the figures and hopefully that will be that.
I'll keep you all posted bow I get on. 

[Chief]

If you're feeling brave I have trued up discs in the past  using an adjustable spanner and some gentle force.   Juddering  brakes are irritating for me.
That was after a track day on a  Zx6r a few years back.  Good luck with yours.

[Bob Andrew]

Worth a try 👍 I'll wait and see how we get on with Triumph, it is annoying though, when you want to do some spirited riding, that's when it shows up big time

[twotigers]

Hi, this maybe a bit way off, but are you sure it's the brakes and not the suspension, while braking, juddering, it is very harsh on the Tridents at the front..

[Bob Andrew]

Yes 2T it is possible.
What We know so far is this started around 10mths old and 3500miles.
Brake calipers I had off and pistons move freely, calipers sliding easily on pins, applied more grease.
Checked run out and 0.22mm Rhs and 0.19mm on Lhs on last check before taking into Triumph Glasgow 2weeks ago.
Thats around .001" old money from Triumph's limit.
Also pulled fuse to ABS to try and rule the unit out, judder still present, although not sure the workings of the ABS unit internals could contribute to this fault without power to it?
Regarding forks (you 2T did a conversion👍) could possibly be something wrong internally, I guess what I'm saying is the run out on the discs looks like the likely suspect, although it would be interesting to see what a new 660's readings are
Short of Triumph fitting a new front end and ABS I will have to go along with Triumph Glasgow's recommendation at this stage.
To give you an idea on a scale to 1 to 10 it feels around an 8, yes it is bad! and a mate who reckons it's really bad !
Thanks for the input and I will keep you all posted
 

[Chief]

If it is discs run out you should feel it at the lever. If its suspension related its equally unpleasant but a quite different feel.

[Bob Andrew]

Hi, OK Triumph Glasgow  :047:fitted two new front discs and pads today, and after 80miles the old (well new) bikes back
Yes it's was as previously mentioned front brake disc warp.
Few pointers didn't feel at lever (like previous bikes) but this could be down to the severity of the judder from the front .
Anyhow all perfect and what a difference, thanks for all the advice.
Will measure and post the readings of the new front disc run out over the next few days
Hopefully no future issues 

[3cyl2cam]

Good to know they sorted it. 👍

[Bob Andrew]

Ok brakes working perfect, After around 130miles of scrubbing in the new disc and pads 
Readings obtained .017mm both discs, bit surprised thought it would be less with new discs but anyway all good and hopefully last we will hear anything untoward in the future.

[Cwaig]

I had a warped rear disc last year before the 1st service - runout was 0.5mm to 0.6mm. Being that far out, you could really feel it (and hear it, even if the pedal wasn't pressed). In my case Triumph warranty replaced it as well and 4000 miles later it's still fine.