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Date:         Wed, 11 Mar 2009 23:12:21 -0700
Reply-To:     David Kao <dtkao0205@YAHOO.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Kao <dtkao0205@YAHOO.COM>
Subject:      Re: home made pressure bleeder
Comments: To: Jonathan Farrugia <jfarrugi@umich.edu>
In-Reply-To:  <Pine.LNX.4.64.0903120132460.26869@goldenaxe.gpcc.itd.umich.edu>
Content-Type: text/plain; charset=us-ascii

That's a good point. Keep in mind that whenever air is compressed there is always moisture in the compressed air. This applies to all home made and Motive bleeders discussed so far. So the one I am going to make actually will have the advantage of having dry compressed air from the compressor, if I do install a dryer. Any idea where I may find a compressor dryer that won't make me go bankrupt?

David

--- On Wed, 3/11/09, Jonathan Farrugia <jfarrugi@umich.edu> wrote:

> From: Jonathan Farrugia <jfarrugi@umich.edu> > Subject: Re: home made pressure bleeder > To: "David Kao" <dtkao0205@YAHOO.COM> > Cc: "Vanagon Mailing List" <vanagon@GERRY.VANAGON.COM> > Date: Wednesday, March 11, 2009, 10:43 PM > two considerations that i can think of. > > 1. you should consider a good dryer for the compressed air > if you don't > already have one. > > 2. brake fluid is an alcohol designed to absorb > atmospheric water. this > is the reason that you change brake fluid. the boiling > point of the mix > becomes lower after it absorbs atmospheric water. not to > mention the > corrosion it causes in the system. normally when you open > brake fluid > unless you have another job coming up in the immediate > future you should > use the contents of the unopened can and disguard the > remainder. that is > because it is going to gain atmospheric water after the > seal has been > broken even though it is just sitting on the shelf. > therefore there > should be some consideration of whether you want to leave > brake fluid in > the bleeder bottle you create or dump it after each > bleeding session. > > http://en.wikipedia.org/wiki/Brake_fluid > > jonathan > > On Wed, 11 Mar 2009, David Kao wrote: > > > I am going to build a power bleeder that is slightly > different > > from all mentioned so far. Since I have a small > compressor with > > an air tank of about 10 or maybe 20 gallons I will use > it as > > a pressurized air source. I will have a bottle made of > hard plastic > > transparent and about 2 liter capacity. There will be > two hose > > fittings on the cap. One connected to the compressed > air source. The > > other connected to the cap of the brake fluid > reservoir cap with a > > fitting on it too. > > > > Internal to the 2 liter bottle one of the fittings > will have a hose > > reaching the bottom of the bottle but the other does > not have a > > hose inside. This 2nd one will be connected externally > to the > > compressor. The 2 liter bottle will be filled with > fresh brake fluid. > > > > The air compressor will be set to 10 or 12 PSI and > holds it there. > > I hope this bleeder is easier to use because I will > not have to > > empty the (pressurized bleeder) after bleeding. The 2 > liter bottle > > will keep the remaining brake fluid in it after > bleeding. The > > compressor will be free from brake fluids. I can drain > down the > > pressure of the air tank before disconnecting the > bleeder. > > > > I do have to visit Home Depot for hose fittings. The > cost will be > > less than $10 I think since I already have the small > compressor. > > > > Has anyone tried this? Will this work? I hope so. > > > > David > > > > > > --- On Wed, 3/11/09, Bob Mac > <yakandhike@COMCAST.NET> wrote: > > > >> From: Bob Mac <yakandhike@COMCAST.NET> > >> Subject: home made pressure bleeder > >> To: vanagon@GERRY.VANAGON.COM > >> Date: Wednesday, March 11, 2009, 6:17 PM > >> Has anybody tried the vacuum bleeder sold by > harbor freight. > >> It's only $19.95 and seems like a simple > operation. No > >> worry about blowing seals and everything is done > right at > >> the wheel, except filling the res. Just curious > > > > > >


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