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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 > ******************************* > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > ~ Shameless link for search engines: http://listarchive.type3.org ~ > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > >