CBR 600F3 1995 - 1998 CBR 600F3 Forum

Front master cylinder issue.

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Old Feb 13, 2014 | 05:08 AM
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paultttt74's Avatar
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Default Front master cylinder issue.

OK, I had to clean the braking system as I have had the bike just on a week and when I got it the front brake lever did not work as it pulled in and had no front brakes at all.
I bled the system and all seemed ok on stand until I went for a ride and noticed a real bad pull to the right that felt like it wanted to drop me when I was going around a right hand corner.
A little while into the ride up a hill in top gear it started to stall so to speak and had to drop down in gear and had no power at all.
When I came to a very slow speed I notice that the front brakes were locking and in fact they had locked and I was riding against the front brakes.
Actually felt like it was running out of fuel.
Called my wife and she came with an 8mm and popped the right bleeder and out flew some brake fluid and then I nursed her home.
When I pulled the front caliper apart(mainly the right) was full of a lovely golden baby crap material.
I then completely cleaned the calipers,lines and master reservoir of this garbage.
All back together and now I cannot get any fluid to leave the master at all.Take the banyo off and put my finger over the hole and I feel vacuum pulling but it will not push out fluid at all.
I have not overhauled the master cylinder but thought was working and now not.
In the process now of leaving it overnight with both bleeders opens and master full of fluid to see if it a air issue.
Maybe the crap in it was the only seal left to allow pressure to send fluid down I do not know.
Anyone else had this issue as really I have added new lines so to speak as they were empty of any fluid and now will not work as it should.
I have tried bleeding them as normal to no evail and do I need to overhaul the master???.
 
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Old Feb 13, 2014 | 08:07 AM
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get a syringe and a length of pipe fill the syringe with brake fluid and connect the pipe to syringe and bleed nipple and insert brake fluid do the same for both sides

get a friend to pump the brake lever whilst pushing fluid in, when the master cylinder has fluid above the low level then you are done and will have a completely air free brake system.

if still no brakes just buy a new M/C for the price overhaul kit is £60 or a radial master cylinder off a 2012 cbr1000rr is £120

make sure it is radial though otherwise its not really an upgrade
 
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Old Feb 26, 2014 | 07:38 PM
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Purchased a master cylinder rebuild kit and still no fluid flows out of master.
I have noticed that when I pump the brake I can see the piston moving but I see the seal and it is not allowing fluid to go into the chamber and then out to the lines?
It is the correct rebuild kit,2 x seals,spring,piston and rubber cover and cir clip.
Put together correctly and gets good pressure when I pull the brake lever but will not pull fluid.
Totally lost and ready to shoot the bike as I have had a gut full.
Got this bike registered with roadworthy and this crap happens.
So over it.
Apart from taking the master cylinder into the bike shop and having them look at it and charge me for nothing get a new master cylinder of a later bike for $300 and then have blown the $70 for the rebuild kit that I cannot return as I have used it.
 
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Old Feb 27, 2014 | 06:05 AM
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Originally Posted by paultttt74
Purchased a master cylinder rebuild kit and still no fluid flows out of master.
I have noticed that when I pump the brake I can see the piston moving but I see the seal and it is not allowing fluid to go into the chamber and then out to the lines?
It is the correct rebuild kit,2 x seals,spring,piston and rubber cover and cir clip.
Put together correctly and gets good pressure when I pull the brake lever but will not pull fluid.
Totally lost and ready to shoot the bike as I have had a gut full.
Got this bike registered with roadworthy and this crap happens.
So over it.
Apart from taking the master cylinder into the bike shop and having them look at it and charge me for nothing get a new master cylinder of a later bike for $300 and then have blown the $70 for the rebuild kit that I cannot return as I have used it.

told ya soooo i did say to buy a new m/c rather than a rebuild kit

sounds like a blockage have you tried pushing the brake fluid through the caliper like i said in my previous posts?

if it wont go in at the caliper its blocked and i would tear it all apart and used compressed air on the lines and caliper to try and unblock it, if not just buy a new master cylinder off a 1000cc bike and make sure its radial for better feel
 
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