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Help; getting air out of brake lines...
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Lightbulb Help; getting air out of brake lines... - July 24, 2012, 12:30 PM

My gsxr600 has been sitting for about 1.5 months.

I started it up and it runs flawlessly, but when I squeeze the brake lever, I get close to zero pressure. I presume this is because of air getting in the lines.

Here is what I tried to do;

I open up the reservoir cup,
I squeeze the lever 10 times, then unscrew the bleeder valve until a little brake fluid seeps out. Then I close the bleeder valve, pump the brake some more, and reopen the bleeder valve.

I did the caliper valve first, then I did the bleeder valve near the lever...

But none of this helped one bit. I am clearly missing something in this process, but I am not sure what and searching around Google is not helping...

Anyone?
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July 24, 2012, 12:35 PM

pump lever.. squeeze and hold.. open valve.. close valve.. release lever and pump.. repeat..


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July 24, 2012, 12:37 PM

Try and bleed the master cylinder first, then the calipers. My 750 is very hard to get all the air out of the system, too.


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July 24, 2012, 12:37 PM

right you want to work from top to bottom..


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July 24, 2012, 12:37 PM

^ this... Getting a brake bleeder pump is the best way really.. the cheap plastic hand versions work fine.

But ultimately, what cuban said works


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July 24, 2012, 12:42 PM



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July 24, 2012, 01:00 PM

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July 24, 2012, 01:55 PM

anyone thinking that it's strange for the brake to get all that air in after sitting for only a month and a half????

Unless your GSXR is a prototype from 1984, a modern sportsbike doesn't just do that. There is something else going on, possibly making it harder/impossible for you to bleed it.

Need more info.


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July 24, 2012, 02:26 PM

Thanks guys, holding the lever in as I loosen the bleeder valve did the trick. Somehow, I have never done this before.
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July 24, 2012, 02:30 PM

Quote:
Originally Posted by Leoallafila View Post
anyone thinking that it's strange for the brake to get all that air in after sitting for only a month and a half????

Unless your GSXR is a prototype from 1984, a modern sportsbike doesn't just do that. There is something else going on, possibly making it harder/impossible for you to bleed it.

Need more info.
My 2004 gsxr has about 50K miles on it.

I am supposed to rebuild the master cylinder with new gaskets to fix the issue. I don't know if it is air coming in per se, or the pressure escaping... Until I rebuild/replace the master cylinder, even if I let the bike sit for a week or two, there is a noticeable difference in brake feel.
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July 24, 2012, 02:40 PM

Your rubber lines also wear and after time they do not hold the pressure as well as they used to.. they tend to stretch instead of hold the pressure like they should..

put some braided lines on there and it will be golden.


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July 24, 2012, 03:45 PM

Quote:
Originally Posted by Witold View Post
My 2004 gsxr has about 50K miles on it.

I am supposed to rebuild the master cylinder with new gaskets to fix the issue. I don't know if it is air coming in per se, or the pressure escaping... Until I rebuild/replace the master cylinder, even if I let the bike sit for a week or two, there is a noticeable difference in brake feel.
Do yourself a favor and do it ASAP: brakes are not something to risk having a failure on. It's very easy too. Could also be a good time to updgrade to a better MC.


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1998 Pegaso 650
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2004 BMW R1150R
2005 Aprilia RSVR Factory
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2002 Yamaha FZ1
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1991 Suzuki GSX-1100R
1991 Honda Africa Twin 750
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July 24, 2012, 04:04 PM

You're right, I'm actually paranoid enough that I would rather have a shop do things like installing SS lines for me, etc.
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