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Old 04-11-2014, 03:15 PM   #1
jonz OP
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Joined: Aug 2004
Location: CA dez (it's a dry heat)/West Yellowstone,MT
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Rear brake issue on 950SE

Howdy gang,
It's happened a couple times now. My rear brake goes away. I bleed it. It works for several thousand miles and then goes away again. No fluid leaks or loss.

Is something failing or need to be rebuilt?

Thanks in advance for any help.
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Old 04-11-2014, 03:25 PM   #2
bigkuri
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Well... my take is if you bleed it and it works, then goes away - you need a master and/or calliper piston seal rebuild. Check the hose as well.

Job done :)

Not much else it can be
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Old 04-11-2014, 03:26 PM   #3
twwhitey
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Overheating? Any chance you might be ever so slightly depressing the pedal? A buddy of mine cooked his rear brake in similar fashion on a long downhill in death valley a few weeks ago - they came back after cooling off.

I've also had the rear brake on my SE go away when riding from sea level in SD to Big Bear (like 8,500') one day. I thought I might have some air in the system or something and I'd need to bleed out the system when I got home but it seemed to recover once we left Big Bear and decended the next day. Oddly enough they've been fine ever since.
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Old 04-12-2014, 12:08 AM   #4
Hodgo
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Id guess that your big fat clod hopper is resting on the brake lever & you don't know it.

It doesn't take much to cook the rear brake on the SE.

Don't ask me how I know this.
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Old 04-12-2014, 02:29 AM   #5
Lc8grrr
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I have the same problem with losing the rear brake, and no I'm not resting my foot on it. I have my lever set fairly high so it is reachable when standing. I lift my foot to get on it whilst sitting. It only fades after hard use ie when chasing an XR650R through a twisty dirt back track last monday. Didn't fade again for the rest of the weeks ride. I was going to change the fluid before I went but didn't. This could be some of the problem. Not enough cooling from the drilled rotor, anyone tried a slotted one? Fluid capacity too small for the size of the bike? Not an issue on a sports bike as you hardly use the rear brake.
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Old 06-28-2014, 07:48 PM   #6
River6822
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Brake Fluid

I had a similar problem until I completely flushed and refilled from a brand new sealed bottle of fluid. Brake fluid can absorb moisture. (Hygroscopic)

I made the mistake of buying a quart sized bottle and it took forever to use up.
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Old 06-28-2014, 08:36 PM   #7
oldfuddy
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Heat Shield

master may or may not need a rebuild… they are just too small for the bike…

I got tired of bleeding every few months… I installed a Galfer rotor and pads and spark plug boot heat sock/shield (keeps exhaust from heating up fluid in line) that deflects up to 1200 degrees F and I run Motul RBF600 high-temp racing fluid… don't know it it will fix your issue, but after years and years of messing with the SE rear brake I've been 14K miles now without a rear brake issue...
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Old 06-28-2014, 08:50 PM   #8
Chuckracer
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All three of my 950's needed the rear brake bled every so often.
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Old 06-28-2014, 11:14 PM   #9
David37
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I have to bleed the rear brake on my SE every 5-6 months to maintain a firm brake pedal.
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Old 06-29-2014, 05:26 AM   #10
charlie264
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Clean and grease the calliper pins (not pad pins), make sure the rubber boots are not split, remove any muck around and clean pistons. Sticking calliper or pistons will add unwanted heat. The brakes reset from the natural wobble of the disc, fractions. Brake fluid is hygroscopic, any moisture will boil easily causing brake fade, higher altitude will lower the temp at which it boils.

If the fluid is clean, and still brake fade then its getting too hot, sticking pistons etc. Or your riding is beyond the capability of the brakes cooling effect, only option is to use higher temperature fluid. As suggested race fluid, Brembo, its not cheap.

I can only get the rear peddle to feel right by reverse bleeding from the calliper.... I must invest in a vacuum kit.
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Old 06-29-2014, 09:10 AM   #11
midfat
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Same for my 950SE. It's great for a few months, then start going away pretty quickly. I've never been able to find any hint of a leak. It just seems to have a six month shelf life. Doesn't appear to be an isolated issue.
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