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Brake judder

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ruansdad27 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ruansdad27 Quote  Post ReplyReply Direct Link To This Post Topic: Brake judder
    Posted: 30 Aug 2018 at 18:50
Need help.

Hi all I have a 2004 Edwards and its sufferingh from brake judder especially when braking from higher speed.  Thinking it's warped discs I took the front wheel to Motoliners in Kent to get them straightened.  The guy checked it and said they were virtually perfect and only a thou out.  Can anyone help?
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wigginsjp View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote wigginsjp Quote  Post ReplyReply Direct Link To This Post Posted: 30 Aug 2018 at 19:12
I'd be surprised if you had warped them. Make sure the disc bobbins can rotate easily between thumb and forefinger and clean them out throughly. Also clean out the calipers so the pistons are nice and smooth running and lastly use some wet and dry and deglaze the pads plus some scotch brite on the discs themselves. 
If it still does it then you may be correct 
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greenman1966 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote greenman1966 Quote  Post ReplyReply Direct Link To This Post Posted: 30 Aug 2018 at 20:20
yeah, I had the same problem, changed brake pads. job done.
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IanG View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote IanG Quote  Post ReplyReply Direct Link To This Post Posted: 30 Aug 2018 at 20:49
Amazing the amount of people who don't bother de glazing the discs and removing the old pad deposits before changing pads Confused

No wonder there is all this talk of warped discs when in reality a good scrub on the surfaces with wet & dry or better yet a rotary carbide brush and freeing up the bobbins would cure a goodly proportion of complaints.

Still I suppose doing the job properly doesn't sell new kit and allow bragging rights down the club showing off new Brembo or BrakeTec trinkets Wink

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Looking forward to the next track day
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426hemi View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 426hemi Quote  Post ReplyReply Direct Link To This Post Posted: 30 Aug 2018 at 22:21
Originally posted by wigginsjp wigginsjp wrote:

I'd be surprised if you had warped them. Make sure the disc bobbins can rotate easily between thumb and forefinger and clean them out throughly. Also clean out the calipers so the pistons are nice and smooth running and lastly use some wet and dry and deglaze the pads plus some scotch brite on the discs themselves. 
If it still does it then you may be correct 

As said above this should cure your problems.
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ruansdad27 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ruansdad27 Quote  Post ReplyReply Direct Link To This Post Posted: 30 Aug 2018 at 22:21
Thanks for your comments, I will give it a go the weekend and let you know how I get on
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ruansdad27 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ruansdad27 Quote  Post ReplyReply Direct Link To This Post Posted: 31 Aug 2018 at 15:36
Right. I've had a look at the bobbins on the discs,  so you mean the round parts that join the rotor to the outer disc?  They are all solid and will not rotate,  what's the best way to free them up and clean them?  The bikes only done 8000 genuine miles so not been used a lot.
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426hemi View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 426hemi Quote  Post ReplyReply Direct Link To This Post Posted: 31 Aug 2018 at 15:43
Put a nut and bolt through and just tighten enough to grip the bobbin and spin it with a ratchet whilst spraying it with brake cleaner.
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Zax View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Zax Quote  Post ReplyReply Direct Link To This Post Posted: 31 Aug 2018 at 15:45
Break Cleaner , tooth brush ,  and a small bit of patience  to free them off.  ( a Mug of  Tea also helps )   I also have used a bit of wooden dowel with a pointed end to free off and spin the little buggers.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote badapple Quote  Post ReplyReply Direct Link To This Post Posted: 03 Sep 2018 at 10:12
I had VERY bad brake judder braking hard at the end of the snetterton straight a few weeks ago. Stripped the calipers down and cleaned everything bobbins moved freely and although I thought the pads we're low ther was plenty of meat left on them so I've put it all back as was and kept the pads in. Would a disc getting thin perhaps cause this mine are the oem and done around 20k ?
I started out with nothing and I've still got most of it left
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Post Options Post Options   Thanks (0) Thanks(0)   Quote IanG Quote  Post ReplyReply Direct Link To This Post Posted: 03 Sep 2018 at 12:10
Possible I suppose but I'd think it more likely to be an uneven pad deposit built up on the surface.

Have you tried thoroughly abrading the surfaces to remove any deposits? 
www.apriliaperformance.co.uk
www.apriliaforum.co.uk
www.apriliaownersclub.co.uk

Looking forward to the next track day
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Post Options Post Options   Thanks (0) Thanks(0)   Quote wigginsjp Quote  Post ReplyReply Direct Link To This Post Posted: 03 Sep 2018 at 19:17
Originally posted by 426hemi 426hemi wrote:

Put a nut and bolt through and just tighten enough to grip the bobbin and spin it with a ratchet whilst spraying it with brake cleaner.

That will free them. 
Almost certain this will be a light and day improvement. Also as mentioned deglaze pads and discs and they will be awesome once again 
www.apriliaperformance.co.uk
www.apriliaforum.co.uk
www.apriliaownersclub.co.uk
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Post Options Post Options   Thanks (0) Thanks(0)   Quote badapple Quote  Post ReplyReply Direct Link To This Post Posted: 03 Sep 2018 at 20:01
I did check all the bobbins and clean the discs with brake cleaner but perhaps not well enough. I'll have another look when I get a chance. 
I started out with nothing and I've still got most of it left
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