You will need compressed air, and you could have soaked the master cylinder in water. DOT 3 absorbs water and your cylinder has set long enough to dry out completely.
Do the following;
remove all the bolts and fittings, then soak the cylinder, water works fast, I never tried Diesel (your comment below) all I can see it doing is causing the seals to swell up making it harder to remove the pistons.
After soaking it for a while, take it from the water and put back some of the fittings and use bolts to close up the cylinder leaving one hole open at the closed end. (caution - don't screw the bolts in so hard that they touch the pistons or go into the cylinder preventing the pistons from moving out of the cylinder. Also, be careful to use the right threads so you don't strip any of them.) now, point the open end of the master cylinder toward the bucket of water and use air from your compressor to move the pistons out. If they only come out part way the first try, push them back and try again. When they come out there will be a bit of water displaced into the air, so use some caution with the air pressure.
Bill
> -----Original Message-----
> From:
> 2cylinderhondas@yahoogroups.com [mailto:2cylinderhondas@yahoogroups.com] > On > Behalf Of > Ronnie Davis > Sent:
> Friday, July 10, 2009 7:10
> PM
> To:
> 2cylinderhondas@yahoogroups.com
> Subject:
> RE:
> [2cylinderhondas] Re: brake mastercylender
> I have already tried to bounce it back hitting it on a 2x4. Didnt > budge. It was rustred pretty bad. What does it cost to have it rebuilt? Thanks > RCD
> To: 2cylinderhondas@ yahoogroups. com
> From:
> tralfaz42@yahoo. com
> Date: Fri, 10 Jul 2009 18:29:57 -0700
> Subject:
> Re: [2cylinderhondas] Re: brake mastercylender
> There's an easy trick to get the piston back out. Get a soft piece > of wood, and slam the MC into it, like a hammer. The inertia of the > piston will get it to back out.
> Now if the MC is corroded, there are
> several shops that can bore and sleeve the cylinder in brass (look in > Hemmings, I use Sierra Specialties) . It is an effective repair, > better than new.
> Bruce D.
> Santa Clara CA
> From:
> Ronnie Davis
>
> To:
> 2cylinderhondas@ yahoogroups. com
> Sent:
> Friday, July 10, 2009 8:08:29
> AM
> Subject:
> RE:
> [2cylinderhondas] Re: brake mastercylender
> My cylender is Stuck. I soaked it in Deisel for a week and thought it would > loosen up. It did just loose enough to let me drive the cylender in and not > loose enough to get back out, so I have a master cylender that I cant get to > work. Thanks RCD
> To: 2cylinderhondas@ yahoogroups. com
> From: 600miles@peoplepc. com
> Date:
> Fri, 10 Jul 2009 14:45:49 +0000
> Subject: [2cylinderhondas] Re: brake
> mastercylender
> Yours is missing? Yours is bad?
> -- In
> 2cylinderhondas@
> yahoogroups. com
> , "Ronnie c Davis"
> wrote:
> > I need a mastercylender for a 72 N600 can any body help
> me. RCD
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