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Back brake question - 10/8/2008 10:28:54 AM

bicklebok

Posts: 106
Joined: 7/7/2008
From: Montgomery, AL USA
Status: offline

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!

_____________________________

Ronnie Daniels in Montgomery, AL
1993 CBR 1000 F
2005 Kawasaki Vulcan 750

Post #: 1

RE: Back brake question - 10/8/2008 11:13:23 AM

Shadow

Posts: 3408
Joined: 12/21/2007
From: Pinetown, South Africa
Status: offline

I think you need to rebleed the system Ronnie.
It''s in the manual.

(in reply to bicklebok)

Post #: 2

RE: Back brake question - 10/8/2008 12:58:47 PM

tobiahr

Posts: 61
Joined: 8/6/2008
From: Austin, TX
Status: offline

the manual

http://myweb.tiscali.co.uk/midlife/images/Honda_CBR1000F_Service_Manual.pdf

Thanks to shadow for the original link

(in reply to Shadow)

Post #: 3

RE: Back brake question - 10/8/2008 1:08:03 PM

MarkR

Posts: 975
Joined: 8/20/2005
From: Gold Coast, Australia
Status: offline

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.

(in reply to tobiahr)

Post #: 4

RE: Back brake question - 10/8/2008 2:21:09 PM

CBRclassic

Posts: 2464
Joined: 8/20/2008
From: Melbourne Australia
Status: online

quote:

ORIGINAL: bicklebok

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!

Another love affair begins!! ... ain''t it just grand

Yer , you are correct mate .... CBR1000''''S are like the better woman in this world .... once you get used to the little extra weight and handling ....they are the greatest !!

Brake bleeding can be a rather slow process... the manual as Pete says will explain it all ..or nearly all

A rule of thumb with bleeding ..start closest to the master cylinder and work away towards the further-est point...

< Message edited by CBRclassic -- 10/8/2008 2:22:30 PM >

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(in reply to bicklebok)

Post #: 5

RE: Back brake question - 10/12/2008 12:16:00 PM

bicklebok

Posts: 106
Joined: 7/7/2008
From: Montgomery, AL USA
Status: offline

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?

_____________________________

Ronnie Daniels in Montgomery, AL
1993 CBR 1000 F
2005 Kawasaki Vulcan 750

(in reply to CBRclassic)

Post #: 6

RE: Back brake question - 10/12/2008 5:10:47 PM

kdawg6262

Posts: 8
Joined: 2/12/2008
Status: offline

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.

(in reply to bicklebok)

Post #: 7

RE: Back brake question - 10/13/2008 12:39:25 PM

bicklebok

Posts: 106
Joined: 7/7/2008
From: Montgomery, AL USA
Status: offline

If i need to rebuild or replace the master cylinder, does anyone know where is the best place to buy? Ronayers wants $209 US

_____________________________

Ronnie Daniels in Montgomery, AL
1993 CBR 1000 F
2005 Kawasaki Vulcan 750

(in reply to kdawg6262)

Post #: 8

RE: Back brake question - 10/13/2008 8:47:34 PM

Shadow

Posts: 3408
Joined: 12/21/2007
From: Pinetown, South Africa
Status: offline

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.

(in reply to bicklebok)

Post #: 9

RE: Back brake question - 10/14/2008 4:09:38 AM

Trips

Posts: 801
Joined: 3/31/2005
From: Perth (Western Australia)
Status: offline

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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Post #: 10

RE: Back brake question - 10/14/2008 5:38:51 PM

bicklebok

Posts: 106
Joined: 7/7/2008
From: Montgomery, AL USA
Status: offline

Shadow 1,

MR Cycles has the kit reasonable. I will rebleed this weekend and if that doesnt work i will order the kit.

_____________________________

Ronnie Daniels in Montgomery, AL
1993 CBR 1000 F
2005 Kawasaki Vulcan 750

(in reply to Trips)

Post #: 11

RE: Back brake question - 10/14/2008 9:54:29 PM

Stray Cat

Posts: 365
Joined: 6/5/2006
Status: offline

quote:

ORIGINAL: bicklebok

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!

There is a specific way and order to bleed the linked brakes. It involves closing the diverter valve up by the front caliper, (so the fluid doesn''t flow to the front if you press on the rear brake pedal, and also you need to bleed the center valve as well. I can''t remember the exact sequence, but the manual will tell you.

Also you really need to use a Mity Vac or similar device instead of just pulling or stepping on the brake levers.

I can almost guarantee that if you follow the method in the manual and use a Mity Vac you will have happy brakes again!

(in reply to bicklebok)

Post #: 12