anybody else have this problem
06-03-2009, 05:35 PM
#1
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Thread Starter
Join Date: Nov 2006
Location: ST.LOUIS
Posts: 114
anybody else have this problem
bike-05 636
problem-front brakes
heres the deal, when doing a stoppie session brakes and master feel great.
its when i stop to take a 5 10 min break, when i get back on the bike i have hardley any lever. it will only go back to normal by riding around fast applying the brakes. hate having to ask for help but im going nuts.
ss lines
motul fluid
damn near new stock pads
no air in lines
master seemed to be ok when tested.
wondering if anyone has had this problem?
and what it turned out to be.
just wanted to ask before i get another master that i might not need.
problem-front brakes
heres the deal, when doing a stoppie session brakes and master feel great.
its when i stop to take a 5 10 min break, when i get back on the bike i have hardley any lever. it will only go back to normal by riding around fast applying the brakes. hate having to ask for help but im going nuts.
ss lines
motul fluid
damn near new stock pads
no air in lines
master seemed to be ok when tested.
wondering if anyone has had this problem?
and what it turned out to be.
just wanted to ask before i get another master that i might not need.
06-03-2009, 05:42 PM
#3
also known as OMR
Join Date: Jul 2006
Location: OMR INDUSTRIES in west palm beach florida
Posts: 79,288
Re: anybody else have this problem
do you have the res mounted lower than the master ?
are there any kinks in your line to the master from the res ?
have you changed your fluid lately ?
are there any kinks in your line to the master from the res ?
have you changed your fluid lately ?
06-03-2009, 05:45 PM
#4
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Join Date: Nov 2006
Location: ST.LOUIS
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06-03-2009, 05:50 PM
#6
also known as OMR
Join Date: Jul 2006
Location: OMR INDUSTRIES in west palm beach florida
Posts: 79,288
Re: anybody else have this problem
my first guess was you were boiling your fluid but normally that would get softer as you ride and get better after it cooled off ..
06-03-2009, 05:50 PM
#7
it is what it is
Join Date: Jun 2009
Location: Los Angeles, CA
Posts: 493
Re: anybody else have this problem
Samething happened to me when the brake lever got pushed in after a crash. Went nuts trying to figure it out. In the end found out it was the master cylinder. I swapped it with a new one and the problem went away and it's been fine ever since. I took apart the master and cleaned it. the piston in the cylinder has a grove and that grove releases pressure so that it doesn't stay locked up. Well, the crash must have damaged either the cylinder wall or something because it didn't hold the pressure in and gradually started getting spongier and spongier after use. Not sure if this is the case for you but that was my story.
Last edited by serious; 06-03-2009 at 05:54 PM.
06-03-2009, 05:57 PM
#8
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06-03-2009, 05:59 PM
#9
also known as OMR
Join Date: Jul 2006
Location: OMR INDUSTRIES in west palm beach florida
Posts: 79,288
06-03-2009, 06:01 PM
#10
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Thread Starter
Join Date: Nov 2006
Location: ST.LOUIS
Posts: 114
Re: anybody else have this problem
Samething happened to me when the brake lever got pushed in after a crash. Went nuts trying to figure it out. In the end found out it was the master cylinder. I swapped it with a new one and the problem went away and it's been fine ever since. I took apart the master and cleaned it. the piston in the cylinder has a grove and that grove releases pressure so that it doesn't stay locked up. Well, the crash must have damaged either the cylinder wall or something because it didn't hold the pressure in and gradually started getting spongier and spongier after use. Not sure if this is the case for you but that was my story.
thank you. im gonna swap out masters and see if that fixes the prob
06-03-2009, 06:10 PM
#11
it is what it is
Join Date: Jun 2009
Location: Los Angeles, CA
Posts: 493
Re: anybody else have this problem
06-03-2009, 06:19 PM
#12
Re: anybody else have this problem
Sounds like a bad master to me.. Had the same problem before
06-03-2009, 09:09 PM
#13
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Join Date: May 2004
Location: Georgia
Posts: 362
Re: anybody else have this problem
I'm probably leaning towards boiled fluid or master also.
Certainly sounds like air being introduced into the top end of your brake system. Make sure you replace that banjo crush washers if you decide to swap masters. They are commonly overlooked and I found them to be the source of air problems multiple times.
Certainly sounds like air being introduced into the top end of your brake system. Make sure you replace that banjo crush washers if you decide to swap masters. They are commonly overlooked and I found them to be the source of air problems multiple times.
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