Mushy Front Brake Syndrome - I may be on to something (turns out not)...

Journeyman said:

I hope you're right. You listed different diameters. Maybe if one of those bikes that the kit goes to matches the bikes using the same calipers as the Rocket it might be more likely to be the right size. Here's the chart of matching calipers...

If you get a rebuild kit and it fits I, for one, would sure like to know.

If you put in your bike on the Brembo website and go to calipers, there's a link to "compatible vehicles" and it lists Aprilia, Ducati, and Triumph. Should be a kit for one of these out there. Put in your year in case there is a difference (doubt it) for newer bikes. Here's what I see....

Front Brake/Clutch Master Cylinder Rebuild Kit?

Measure pucks and order seals, 30mm probably but seals for calipers as mentioned calipers are available.

www.r3owners.net

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Journeyman said:

Update on this great idea of mine.... well, not so great. it has returned to its previous state. Here's what I think is happening......
I’ve heard it explained that tying up the lever overnight forces the air bubbles into smaller (atomized?) particles that are less compressible, but they soon gather back. I was hoping that by opening the MC before releasing the lever it would let that air escape, but it really hasn’t worked. It’s not like it forces the big bubbles to the top, but just disperses them into super small molecules. That's why when I open the valve to bleed the MC I didn't get any bubbles. Oh, well, guess it's time to rebuild the calipers and, eventually, either buy a new MC or find a rebuild kit from another bike with similar internals (not sure it exists).

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TURBO200R4 said:

this is what i think not necessary what a professional or other people might think.
as far as putting a weight on the pedal while setting i thought that test might show up a leak so it is good to know that did not happen.
i think that most of the time what i post is a test and not a fix. on most things you have to run a lot of test b4 you find a fix.
let me explain about my theory is that once the brake is bleed and you have a good firm brake then maybe it might stay good over a long term parking if you hang a weight on it.
i did not expect it to bleed the rear master cylinder.
until someone with the brake problem bleeds their brakes to achieve a good brake and then hangs a weight on it and let it sit for a good while i will not have the answer that i want. now this is not a fix but if this works it might help the guys that store their bike over the winter.

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