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Brake Stutter and possible Clutch Engage issue
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TNT
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Brake Stutter and possible Clutch Engage issue - July 25, 2012, 10:15 PM

08 R6 - New problem on a new (used) bike. Coming to a stop using front brake, the lever stutters and the front brake feels like it's skipping (locking then unlocking).

On my 07 R6, with the bike turned off, I could be in gear, pull in clutch, and wheel the bike around no problem. On this bike, it is off, I am in gear, pull in clutch, and it barely moves, sometimes makes a squeaking/griding sound.

This makes me think the clutch adjustment is off and it's never fully engaging even with the clutch pulled in. Would this also lead to the jerkiness in stopping? Maybe the brakes are fine but when I pull in clutch, the transmission is still partly in gear so the bike is trying to hop forward? I don't have problems when stopped though with the bike stalling.

Thoughts?

Thanks.
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July 26, 2012, 09:10 AM

Sounds like a warped rotor and a bad clutch adjustment. However if the clutch is doing something odd causing the bike to lurch as you apply the front brake then it will cause the bike to lurch when you only apply the rear brake.

So... come to a stop with the rear brake only and if your lurching problem is gone you know you have a warped/bent rotor.If not, them maybe clutch? It's a slipper clutch and I don't know anything about them really.


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July 26, 2012, 09:16 AM

Sounds like you have some oily residue on disk. If that is the case, I suggest cleaning the whole brake area with brake cleaner. Assuming your pads absorbed some of this stuff, take them off and sand them down manually till you see "clean" braking compound emerge.

As for the clutch, seems it's not fully disengaging, simply adjust it (if cable) or bleed it (if hydraulic)


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↓ dn ʎɐʍ sıɥʇ ↓
 
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July 26, 2012, 09:45 AM

Replace brake rotors and steel plates in the clutch (if not just replace the entire clutch pack).

Sounds like warped/built up rotors and warped steel plates.


-Ryan
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TNT
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July 26, 2012, 09:25 PM

Rode it today and I am now convinced its a warped rotor. I put on asv levers last night and now have a better feel and can tell at higher speeds there is a little pulsing. Does not seem to be a clutch problem at this point. Do rotors normally get replaced as a pair? It only seems to be the front left that is warped.
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July 27, 2012, 06:45 AM

I would replace both. Just like replacing brake pads.
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July 27, 2012, 06:53 AM

Yes, replace both.


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July 27, 2012, 08:06 AM

if it's pulsating it's def warped, change both. If the disk has enough material you could simply have them milled, but for what they cost new I wouldn't even bother, they are thin to begin with.


2011 Ducati Diavel Chromo (Current)
2007 BMW R1200GS Adventure (Current)
2006 BMW R1200ST
2003 BMW K1200GT (Current)
2004 Ducati 998s Final Edition (Current)
1997 Aprilia RS250
1998 BMW K1200RS
2000 Ducati 998
1998 Pegaso 650
1999 Ducati 996S
2004 BMW R1150R
2005 Aprilia RSVR Factory
2001 Triumph Tiger 955i
2002 Yamaha FZ1
2006 Buell Ulysses
1991 Suzuki GSX-1100R
1991 Honda Africa Twin 750
2008 Mobster Lefty Trophy pitbike
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