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How Much Brake Fluid for at good purge? [message #120496]

Fri, 01 April 2011 08:51

Matt Colie

Messages: 8547
Registered: March 2007
Location: S.E. Michigan

Karma: 7

Senior Member

For reasons I will not bore you with, I may have soon have an opportunity to actually get started on my winter work list (and really hope to be ready for the season by September).

Brake system flush is not the list this year. I even read all of Gene's great sight and found nothing other than a reference that one person put 2 quarts in the power bleeder he built.

Is 2 enough? How much does one typically go through either power or vacuum bleeding.

I'm not sure which method I use yet. Vacuum works well on my cars because they are small and you don't empty the reservoir on any one wheel. I would have to build the rig for pressure bleeding, and that would add to the delay.

Matt

Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

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Re: [GMCnet] How Much Brake Fluid for at good purge? [message #120497 is a reply to message #120496]

Fri, 01 April 2011 08:57

James Hupy

Messages: 6806
Registered: May 2010

Karma: -62

Senior Member

Matt, 2 quarts should more than do it. The principal reason for using a
power bleeder is to thoroughly evacuate all the bubbles in the common line
that feeds the rear bogies. When you pedal bleed, or vacuum bleed, the loss
of a continous flow of fluid contributes to the problem. When there is a
larger volume of fluid, like there is when a pressure bleeder is used, there
is a steady stream of fluid under pressure that exits when the wheel
cylinder bleeder valve is opened and no back flow is possible, therefore
eliminating air from being sucked back through the bleeder valve.
Jim Hupy
Salem, OR
78 GMC Royale 403

On Fri, Apr 1, 2011 at 6:51 AM, Matt Colie <mcolie@chartermi.net> wrote:

>
>
> For reasons I will not bore you with, I may have soon have an opportunity
> to actually get started on my winter work list (and really hope to be ready
> for the season by September).
>
> Brake system flush is not the list this year. I even read all of Gene's
> great sight and found nothing other than a reference that one person put 2
> quarts in the power bleeder he built.
>
> Is 2 enough? How much does one typically go through either power or vacuum
> bleeding.
>
> I'm not sure which method I use yet. Vacuum works well on my cars because
> they are small and you don't empty the reservoir on any one wheel. I would
> have to build the rig for pressure bleeding, and that would add to the
> delay.
>
> Matt
>
> --
> Matt & Mary Colie
> '73 Glacier 23 Chaumiere (say show-me-air)
> SE Michigan - Twixt A2 and Detroit
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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Re: How Much Brake Fluid for at good purge? [message #120507 is a reply to message #120496]

Fri, 01 April 2011 11:47

lqqkatjon

Messages: 2324
Registered: October 2010
Location: St. Cloud, MN

Karma: 5

Senior Member

I will mention here that Jim Hupy sells a pressure bleeder at a fair price. you should contact Jim before building one yourself.

i say that because I feel bad that I did not get one from you, but I found that I had access to one through work for free.

I did pressure bleed my dune buggy, and my friends jeep, and now I will never mess with vacuum, or pedal bleeding again. I have been in the dark for so long it is sad i did not know about pressure bleeding in the past.

It saved me a ton of time on those cars too! my time would of paid for a pressure bleeder from Jim.

I am just waiting on some time to do the brake work on the gmc to pressure bleed that.

Jon Roche 75 palm beach EBL EFI, manny headers, Micro Level, rebuilt most of coach now. St. Cloud, MN http://lqqkatjon.blogspot.com/

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