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Old 12-28-2015, 10:03 PM   #1
Swade
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HELP! Rear brake 2009 CBR600rr

Hey y'all,

So ever since I bought my bike the rear brake never had the greatest feel it felt very soft and never felt like it engaged properly, almost like there a good bit of air in the line. So I tried to bleed it following the common steps, open the reservoir, top it off, put a piece of hosing on the bleed nipple and have it flow into a bottle, start pumping to build pressure, hold down the pedal and crack open then bleeder valve, then close bleeder and release the pedal. It worked well a couple times until eventually when I open the bleeder nothing happened, no air no fluid, nada.

What should I do? This is my main mode of transport and would really like to get this fixed right away if possible
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Old 12-28-2015, 10:24 PM   #2
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Well the good news is that you don't need to panic as you can get by without the rear brake. Second, I think you might need to remove the caliper, pop out the piston/s and clean everything very well. Snag a pair of new seals, reassemble and bleed again. In some cases, you might even be able to re-use the old seals if they aren't too bad, but I'd recommend you put new seals in there if you've already got it apart. It sounds like there's something g blocking the oil passages.
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Old 12-28-2015, 10:56 PM   #3
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Who uses their rear brake?
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Old 12-28-2015, 10:58 PM   #4
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Quote:
Originally Posted by 40acres View Post
Well the good news is that you don't need to panic as you can get by without the rear brake. Second, I think you might need to remove the caliper, pop out the piston/s and clean everything very well. Snag a pair of new seals, reassemble and bleed again. In some cases, you might even be able to re-use the old seals if they aren't too bad, but I'd recommend you put new seals in there if you've already got it apart. It sounds like there's something g blocking the oil passages.
I know I can get by with my front only and engine braking but I guess its a peace of mind thing having the rear as well. Not that I have no issue replacing the seals but I just am not competent in doing so, bleeding brakes and changing pads yes, but disassembling the caliper not so much :$ The only idea I have now is to take it to Wild West
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Old 12-28-2015, 10:59 PM   #5
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Who uses their rear brake?
This guy lol I use both front and rear together since my accident a few months back, just feels weird not having it
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Old 12-29-2015, 10:37 AM   #6
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Does anyone know a place that would be open near the Katy area to help me with my rear brake? Or would anyone be willing to help me out? I called Wild West and because the previous owner relocated the reservoir and is aftermarket they said they cant work on it because of a liability issue :/
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Old 12-29-2015, 11:01 AM   #7
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take a pic of the reservoir? it is just a clear tube?

You just need to get a vacuum bleeder and I bet it fixes your issue.....
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Old 12-29-2015, 11:30 AM   #8
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I am at work at the moment so I cant take a picture. and I probably should just invest in one, probably just a line full of air right now
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Old 12-29-2015, 11:51 AM   #9
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Bleed the brakes by opening the banjo bolts just a little. Pump the brake, hold the lever down and loosen the banjo bolt just a enough to force fluid out. I've done this many times and it works. Air get stuck there for some reason and provides mushy feeling.
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Old 12-29-2015, 01:26 PM   #10
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Quote:
Originally Posted by signpimp View Post
Bleed the brakes by opening the banjo bolts just a little. Pump the brake, hold the lever down and loosen the banjo bolt just a enough to force fluid out. I've done this many times and it works. Air get stuck there for some reason and provides mushy feeling.
It's true, air can get trapped at the banjo fitting but, if you're getting no fluid or air at the bleeder, keep trying.
Bleed it and bleed it. You're only moving a few drops at a time so, it may take a while.

If, after you're sure you've done all you can that way, it still doesn't feel right, THEN try the banjo bolt idea. Be extra careful that you don't allow air to be sucked back into the system.
It's very easy to accidently have that happen when messing with banjo fittings.
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Old 12-29-2015, 02:06 PM   #11
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Quote:
Originally Posted by signpimp View Post
Bleed the brakes by opening the banjo bolts just a little. Pump the brake, hold the lever down and loosen the banjo bolt just a enough to force fluid out. I've done this many times and it works. Air get stuck there for some reason and provides mushy feeling.
I should have explained a little better. To keep air from getting into the banjo bolt, maintain the pressure on the brake lever (as you are slowly opening the bolt) and close the banjo bolt before releasing the lever. This will prevent air from going back in. You will also get a lot more fluid (with a little air hopefully) coming out of the banjo fitting, just top off your reservoir. I've done this many times and it works. After doing both banjo bolts, go back and check the regular bleeder again.
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Old 12-29-2015, 02:29 PM   #12
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UPDATE: So I went home for lunch and rode the bike around a bit and then came back and noticed the rear master cylinder is covered in fluid. So I am guessing this is a seal issue? Do I just get a new seal kit and get it fixed? I called a couple places and 2 of them said "Just get a new master cylinder for $130"
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Old 12-29-2015, 04:12 PM   #13
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*ignore this, picture looked bad*
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Old 12-29-2015, 04:13 PM   #14
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HELP! Rear brake 2009 CBR600rr
Here is a blow up diagram of the master cylinder assembly for easier reference, from what I gathered from the 2 shops that called they said all I would really need is the #4 which is the whole assembly
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Old 12-29-2015, 04:31 PM   #15
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Old 12-29-2015, 04:33 PM   #16
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Old 12-29-2015, 05:26 PM   #17
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Thanks! I jumped on it so hopefully this will do the trick!
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