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Old 08-21-2012, 08:34 AM   #1
Dumptruck
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Tech Help Brakes and Chain

I picked up an 05 SV650s with 4300 miles on it thats been sitting for 5ish years. The front brake master cylinder piston was stuck so I pulled it out and cleaned it all up and it works just fine now. I drained and cleaned the fluid reservoir and put in some fresh DOT4 and started the bleeding procedure. At first everything was going fine....pump the brake 6ish times till I had some pressure and hold, open the bleed screw let the old fluid and bubbles out, close the screw, release the lever, repeat. I did the short side first which is a no no but for the issue I am having now that should not matter. After a few times going through the process of bleeding the brakes now I cannot get any pressure on the lever. A couple of times I hade to pump the lever like 25 times to get pressure but I figured that is just because I let out alot of fluid. Finally I pumped it like 50 times and I could not get any pressure so I gave up and walked away to leave it for another day. About an hour later I went back and pulled the lever and I had pressure. So I bled the brake and tried pumping again but got nothing again. I gave up.

What would cause this? I see no leaking fluid and the reservoir level is not dropping so I do not understand how I cannot get pressure.

I'm not sure what to think about the chain. I know it's dirty and needs to be cleaned and lubed but does it need to be replaced? It is not stretched, I already checked that and its within limits. Can it be saved or does it need to be replaced? I'm not sure if this can be determined bu the pictures or not.....
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Last edited by Dumptruck; 08-21-2012 at 08:34 AM. Reason: Spelling
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Old 08-21-2012, 08:48 AM   #2
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Chain looks pretty bad IMO
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Old 08-21-2012, 08:56 AM   #3
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I would replace the chain
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Old 08-21-2012, 09:37 AM   #4
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Probably should get a rebuild kit and redo the front MC.
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Old 08-21-2012, 09:44 AM   #5
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Quote:
Originally Posted by mx6er View Post
Probably should get a rebuild kit and redo the front MC.
I was thinking that would be my next step but I wanted to reach out for some suggestions.
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Old 08-21-2012, 09:56 AM   #6
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Chain is toast. If you ride it like that the rust will quickly tear up the o-rings.

Brakes, if you are not leaking anywhere, maybe you have some air in the resivoir or around the brake lever. Having pressure after letting is sit would point me in that direction.
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Old 08-21-2012, 09:59 AM   #7
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Be safe and replace the chain. Not something you want to deal with far away from your home or a shop. Or the chance come flying off and tear into your calf.

As for the m/c, if your positive you rebuilt it right, you may just have too much air in the line. Try to get your hands on a bleeder kit to help. If you don't have any leaks, sounds like you need more fluid in the line. Just make sure to keep the reservoir full while pumping & bleeding.
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Old 08-21-2012, 03:56 PM   #8
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Probably air in the lines or you have a gummed up MC and it's time for a rebuild/clean.
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Old 08-21-2012, 11:35 PM   #9
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Update!

I got a vacuum bleeder and bled both sides. It was going great for a little while then pretty much nothing but air came out. I thought that I bled all the fluid out and there was a problem with the MC but to my suprise when I pulled th lever and I had pressure. I was shocked. So for grins I bled one side the old fashioned way to see what would happen and fluid came out. I closed the bleed screw and pumped the lever a few times and i could not get pressure. I put the vacuum bleeder back on it for a minuet and the pressure came back. I'm really confused now. I even putted around on my street and tested the front brake a bunch of times and it stopped fine and had good handle pressure. I did get my hands on a MC rebuild kit so I think I will try that tomorrow. The mechanics of how I'm drawing nothing but air with the vacuum bleeder but yet I have lever pressure boggles my mind.

Question about the vacuum bleeder....
I should be able to put it on the nipple, open the bled screw and pull fluid straight from the MC right? No pumping of the lever involved correct?

Last edited by Dumptruck; 08-21-2012 at 11:37 PM. Reason: Grammer
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Old 08-22-2012, 03:46 PM   #10
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Insert tubing over bleeder nipple.
Pump the vacuum bleeder to create negative pressure. ~15 psi i guess?
Crack open bleeder.
Let it draw it all out till there's no vacuum.
close bleeder nipple.
top off reservoir with brake fluild
repeat.

Make sure your bleeder isn't gummed up. never seen it happen before though.
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Old 08-22-2012, 04:22 PM   #11
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Quote:
Originally Posted by cuong-nutz View Post
Insert tubing over bleeder nipple.
Pump the vacuum bleeder to create negative pressure. ~15 psi i guess?
Crack open bleeder.
Let it draw it all out till there's no vacuum.
close bleeder nipple.
top off reservoir with brake fluild
repeat.

Make sure your bleeder isn't gummed up. never seen it happen before though.
Yep, I did it right. I thought so, I youtubed a bunch of mityvac vids so I didn't think I screwed it up. I have no I idea how I was sucking nothing but air yet I still hand lever pressure and working brakes.
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Old 08-22-2012, 04:32 PM   #12
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Maybe you don't have a good seal on the nipple?
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Old 08-22-2012, 09:28 PM   #13
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Thumbs up

Rebuilt the master cylinder and she is as good as new now. Chain and tires are next then she should be rideable.

Thanks for the help guys.
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Old 08-22-2012, 09:38 PM   #14
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By the way this is what I used as a vacuum for bleeding the brakes and it worked like a champ. $3 for 2 at the tractor supply store. Living in the sticks pays off sometimes.

http://www.tractorsupply.com/produce...k-of-2-1019805
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Old 08-22-2012, 10:34 PM   #15
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Good to hear!
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Old 08-22-2012, 10:36 PM   #16
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thats a pretty good idea lol
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