I would just add the following...
In using compressed air... I just wrap a rag around the dangerous end, folded
over a couple times, with some slack... and hold it the rags tightly around
the sides... and let it "shoot" into that... thereby stopping within a few
inches of the bore... This may have been what you had in mind... but I
would hate to see people trying to aim their master cyclinder at a pile of
rags several feet away, etc...
BE EXTREMELY careful about this... it does come out as a projectile... but it
is easily stopped by rags... I've only managed to hurt myself doing this, over
the years, when I accidently allowed a finger or part of my hand wrap around
the dangerous end... hence...shooting myself... fortunately... it's always
just been one of those wounds that the TV guys get... it grazed me.... no
damage.
SECONDLY.... I have often found that it breaks free simply by giving the
cyclinder a good strike downward on a piece of wood. ...while this very
often does the trick for loosening it... I usually still find I can't withdraw
it... so... once again... a little air pressure seems to be the way to go.
--Justin
Malcolm Walker wrote:
> On Thu, 27 Aug 1998, Jerry wrote:
>
> > Help! I know this question probably just got asked. I trying to
> > rebuild the brake master cylinder. I removed the circlip and valve from
> > the assembly but the piston but is stuck and I can't get it to budge.
> > Any ideas on how to solve this?
>
> This here's something I will add to the FAQ. Anyway, here's some
> pointers:
>
> -scrape all the guck out of the bore using a popsicle stick, or similar
> implement
> -fashion a fitting using a grease nipple and a brake fitting; use grease
> gun to provide back pressure to force piston out
> -Use air compressor to force piston out, may require different fittings as
> above (WARNING: Do not point the bore at anything valuable, especially
> yourself!) Best thing to do is to clamp the master cylinder into a vise
> (or onto bench) and "shoot" the piston into a pile of rags
> -If it still won't budge, soak it in brake fluid / mineral spirits /
> penetrant, try again
> -apply a little heat (submerge master in hot water) ...open flames are
> NOT recommended. You could melt the rubber bits and fuse the piston into
> the bore. You also could catch the brake fluid / penentrant / grease on
> fire.
> -see if the piston will move into the bore. If it can, you may be able to
> use the inner spring (if there is one), and use the spring force to push
> the piston out.
> -whack the back of the cylinder using a *soft* faced hammer, piece of
> wood, forehead, whatever.
> -Last resort: Drill a hole in piston, and use EZ-out or self tapping
> screw to pull free.
>
> If anyone would like to offer suggestions, elaborations, they would be
> most welcome. I will update the FAQ asap.
>
> -Malcolm
> * There is a FAQ for this list! Its temporary home is:
> http://www3.bc.sympatico.ca/walker/triumph/trfaq.htm
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