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Re: [T3] Brake caliper pump


Neat!  that pin coming out means youve really built an effective setup now.

Keith

Keith Park

Top Notch Restorations
topnotch@nycap.rr.com
71 Squareback
65 Notchback
65 Squareback
87 Golf
88 Rx7 10th Anniversary

----- Original Message ----- 
From: "Jim Adney" <jadney@vwtype3.org>
To: <type3@vwtype3.org>
Sent: Saturday, July 31, 2004 11:45 PM
Subject: [T3] Brake caliper pump


> I finally managed to finish one of my long term projects, and it actually
> works.
>
> I use water pressure to push the pistons out of brake calipers. Our water
> pressure here in my basement is ~100 psi, which is enough for this job if
the
> calipers are in pretty good shape, but so often they are not and I spend
hours
> coaxing the suckers apart. Plus, in one corner of the basement I probably
have
> a dozen calipers that I haven't been able to budge since they sat in
someone's
> barn for too long.
>
> What I've needed was a way to boost the water pressure here by a factor of
3 to
> 5 so that I could be assured of success with minimal difficulty. I had
tried
> converting a grease gun, but that leaked too much and didn't have enough
> displacement, so I made my own hand pumped master cylinder.
>
> It uses old VW ATe MC internal parts and has an aluminum housing that I
can
> take apart fairly easily when I'm done, so that things don't tend to
corrode.
> I'm still using the grease gun handle from the Mark I pump, so that
purchase
> was not entirely wasted.
>
> Tonight I finally got everything plumbed together and assembled, and I
took
> apart 3 calipers that I had thought were completely hopeless. I don't
actually
> know yet if there are any parts here that I will be able to use in the
future,
> but at least I now know that this job will be a lot easier.
>
> One of the pistons was so tightly rusted to its compensating pin that it
pulled
> the pin out of the caliper body when the piston finally came loose.
>
> I still need to make a better fixture to plug the hole where the first
piston
> came out, but I have a couple of ideas about that, and maybe the one I
already
> have will be good enough for most calipers..
>
> Just had to share....  ;-)
>
> -- 
> *******************************
> Jim Adney, jadney@vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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