CBR 1000F "Hurricane" 1987-1996 CBR 1000F

Brake chatter

  #1  
Old 08-07-2018, 09:11 AM
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Default Brake chatter

Just got done bleeding all my brake lines on my 93 cbr1000. Brakes seem to be fine until I reach a slow speed. At that point the brakes feel like they are chattering/pulsating, making the handlebars vibrate. I can not feel this while driving highway speeds only when I slowing down to a stop... Any idea's what this could be??
 
  #2  
Old 08-07-2018, 02:03 PM
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Condition of pads/rotors? Give 'em a visual if you haven't already
 
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Old 08-09-2018, 08:44 AM
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Warped disc.
A few ways to prove this but your description is classic of this issue.
 
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Old 08-15-2018, 04:02 PM
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Originally Posted by Ducati View Post
I can not feel this while driving highway speeds only when I slowing down to a stop.
If the bike were sitting for a while, the rotors may have picked of some carbon from the pads causing a hard spot. If the rotors are not warped, they may feel smooth at speed but pulsate when going slower.

 
  #5  
Old 08-20-2018, 10:47 AM
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Well found out the issue, seems when I reinstalled the front tire the pads stayed on the outside of the rotor....dahhhh no clue how I did that but that is fixed. Now seems I've lost rear brakes. Pump the foot pedal pressure comes up, get of for IDK 30 sec maybe then depress again and pedal all the way down. So I rebuilt the rear master cylinder bleed them and well hmmm same result. the rear caliper during the first bleeding I coiuld not get any flow out of the fwd most bleeder but the pads appeared to be working correctly. So I guess I'm gonna go and rebuild the caliper , not a big deal and will hurt to do so. If you guys have any idea what else it could be please feel free to chime in.
 
  #6  
Old 08-20-2018, 11:51 AM
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Are you bleeding the LBS the proper way?

Here's a LINK on 'How-To'.
 
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Old 08-20-2018, 11:58 AM
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“Well found out the issue, seems when I reinstalled the front tire the pads stayed on the outside of the rotor....dahhhh”
jeez mate lol
 
  #8  
Old 08-21-2018, 10:38 AM
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yup following the same bleed procedure
 
  #9  
Old 08-28-2018, 10:54 AM
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well finally got the brakes squared away, after rebuilding the rear master and the rear caliper, turns out there was a thick goo in the brake line. it was bad enough the when fluid began to flow it would come to a dead stop. We'd have to remove the drain line clean it then attach back to the bleed fitting. In all the yrs I have worked don both 4 and 2 wheels I have never ran into anything like that! Dirty ya but thick goo...nope. guess the folks who owned it before me never ever bleed the system..Thanks for all the help out there!
 
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