brake piston removal

Ernest Montague afm199 at
Mon Nov 5 05:39:35 PST 2007

at this point I would look for a system on ebay, yurs  is probably 
totally corroded.

On Nov 4, 2007, at 11:23 PM, Donlon McGovern wrote:

> It sounds like you have accumulated water in your brake fluid, hence 
> the cloudy, creamy texture. Good thing you are disassembling them. If 
> I were doing it I would bleed all the old fluid out of the system with 
> clean fluid and get all the creamy stuff out. Then, once you have 
> removed the caliper assemblies you should be able to just squeeze the 
> brake lever and push the pucks out enough to pull them out by hand. 
> You will probably have to replace the rubber seals and use a fine 
> abrasive emery paper to gently scrub the cylinders if they are rusty. 
> But, if they are just cruddy, a good brake cleaning fluid should flush 
> the crud out. With the seals back in place you should be able to push 
> the pucks back in but you might need a stiff section of thin board to 
> get them flat with the surface of the caliper assembly. Mount them 
> back, squeeze the brake lever to reseat the pads and then bleed again 
> until you get all the air bubbles out. There may be other suggestions 
> from Zoran or Jim Stewart or any other listers that have done this far 
> more often than me. I'd say you biggest problem is not bleeding your 
> brakes often enough to purge water out of the system. Remember, brake 
> fluid is hydroscopic, it absorbs dihydrogen oxide (fancy name for 
> water).
> dm
> ----- Original Message ----- From: "David kerr"
> So, this is the first time I've disassembled the brakes on my '99 
> SV650x. So far I have discovered that the brake  "fluid" was white and 
> the cinsistancy of room temperature sour cream. What causes this?
> I've also discovered that one or two of the seals are pushed out and 
> showing next to the pistons.
> 2nd Question: How in the world do you remove the brake pistons without 
> the use of compressed air from the back as the service manual 
> suggests. I obviously don't want to scratch, scar or squeeze the 
> pistons, so what's the trick?
> Lastly, any tips on cleaning and replacing the same pistons?
> Thanks,
> David

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