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

Back brake question

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Old Oct 8, 2008 | 12:28 PM
  #1  
bicklebok's Avatar
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Default Back brake question

One of the first things I did on my 93 Hurricane with 45k miles when i bought it a few months ago was to change the brake pads and flush out all brake fluid with new. I bled the rear brake caliper and the one on front linked to the rear brakes. About 2 months later my rear brake started leaking down when i first apply pressure and i have to pump it a couple of times to get a full pedal. I read somewhere on the forum that there is another bleeder screw on the valve under the seat, but i have never bled it. Could this be causing the problem? And which order to I bleed in? Its not leaking brake fluid by the way.

Thanks everyone!

By the way, I absolutley love my bike!! I have put about 6k miles on it with no problems. Took me a little while to get used to the weight and handling, but once i did, it sure is great!
 
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Old Oct 8, 2008 | 01:13 PM
  #2  
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Default RE: Back brake question

I think you need to rebleed the system Ronnie.
It's in the manual.
 
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Old Oct 8, 2008 | 02:58 PM
  #3  
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Default RE: Back brake question

the manual
http://myweb.tiscali.co.uk/midlife/i...ice_Manual.pdf

Thanks to shadow for the original link
 
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Old Oct 8, 2008 | 03:08 PM
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Default RE: Back brake question

I change the pads myself once and afterwards when I disc got hot, the brkes got soft.
It was a stuck pistion and had to be cleaned and fuild changed.
 
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Old Oct 12, 2008 | 02:16 PM
  #6  
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Default RE: Back brake question

I think it may be the mater cylinder that has gone bad. I have to pump the brake pedal to get a full pedal. It didnt do that when I first flushed the brake fluid, changed the pads, and bled the system. It recently started this problem about 2 months after the service. Anyone have any thoughts on that?
 
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Old Oct 12, 2008 | 07:10 PM
  #7  
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Default RE: Back brake question

sounds like you might just need to rebuild the master cylinder, new piston and seal. as for bleeding the brakes, you want to startfrom the farthest from the master and work you way forward.
 
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Old Oct 13, 2008 | 02:39 PM
  #8  
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Default RE: Back brake question

If i need to rebuild or replace the master cylinder, does anyone know where is the best place to buy? Ronayers wants $209 US
 
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Old Oct 13, 2008 | 10:47 PM
  #9  
Shadow's Avatar
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From: Mud hut, Zululand
Default RE: Back brake question

You can probably buy a good secondhand one on e-Bay, or replacement rubber refurbishing kits are available.
Try www.mrcycles.com and look at the prices there.
 
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Old Oct 14, 2008 | 06:09 AM
  #10  
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Default RE: Back brake question

Its pretty rare you need to rplace the master cyl. Usually a seal kit will do the job. Plenty of kits on Ebay
 
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