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Rear disc brake fluctuating!

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Dave M
Scooby Slapper



Joined: 03 May 2013
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PostPosted: 16:33 - 21 Aug 2014    Post subject: Rear disc brake fluctuating! Reply with quote
Hi all,

Bike passed MOT with 1 advisory. It says rear brake fluctuating? What could be the cause and fix for this? I can feel it when braking. Pedal moves up and down while applying the brake but brakes ok. Hope this makes sense. Cheers.
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raesewell
Traffic Copper



Joined: 22 Oct 2012
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PostPosted: 16:42 - 21 Aug 2014    Post subject: Reply with quote
Sounds like it could be a warped disc
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Howling TerrorOutOfOffice
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Joined: 05 Dec 2008
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PostPosted: 17:28 - 21 Aug 2014    Post subject: Reply with quote
Get the rear wheel off the ground and hold a pencil against the swingarm. Spin the wheel and see how much the disc is out of true.
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Dave M
Scooby Slapper



Joined: 03 May 2013
Karma :
PostPosted: 17:31 - 21 Aug 2014    Post subject: Reply with quote
HT wrote:
Get the rear wheel off the ground and hold a pencil against the swingarm. Spin the wheel and see how much the disc is out of true.


I will give this a try! Might not be too bad considering it passed MOT? Cheers.
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 17:39 - 21 Aug 2014    Post subject: Reply with quote
Usually either a warped disc or corrosion between the disc and the hub. Can be other thngs too but less likely.

Normally means a new disc and pads.
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I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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