Diesel RVs: Re: [diesel_mercedes] Re: reverse bleeders

When I was a young'un we had pressurized brake bleeders.
Would they move brake fluid through the lines fast enough to force out the air bubbles on those down-lower cylinders?

Otherwise, I do like nate - I flush out the dirty fluid the usual way and then if I can I back bleed to force the bubbles uphill. That requires 2 people though.

But I also have a bleeder hose with a check valve near the wheel cylinder so that I can bleed them single handed. the hose is 15 feet long and clear so I can see when the fluid is clean and I can see any and all bubbles as they return to the master cylinder. (Yes once it's clean I let it go back to the master cylinder.)

When the bubbles stop I figure that is as good as I can get. Even though I'm still sure from the feel that there are bubbles in the system. there always seems to be a little too much sponginess in the pedal for me. When there are no bubbles it will be rock hard when it does stop. I used to be able to do that when I was in high school and working at gas stations. Not so much since then.

Bogy.

--- On Mon, 4/15/13, Larry <dittmer.larry@yahoo.com> wrote:

> That is a common practice with
> airplanes and some farm machinery where the master cylinder
> is way above the wheels. When you pump fluid in the
> wheel cylinders, you push the bubbles up into the master
> cylinder, the same direction that they tend to float.
> It can take a lot of fluid to push bubbles down from the
> master cylinder to the wheel cylinders when the wheels are 6
> feet down on a combine harvester.
>
> The down side of this method is that you can push dirt from
> the wheel cylinders up to the master cylinder. That
> can be a very bad thing, because master cylinders and the
> other stuff up there is much more complex than a wheel
> cylinder. On my Mercedes I bleed the brakes pumping
> from the master cylinder to get clean fluid into the wheel
> cylinders as well as get rid of bubbles.
>
> Larry
>
>
> --- In diesel_mercedes@yahoogroups.com,
> <corvallis@...> wrote:
> >
> > You got Mechanics and you got Designers. They don't
> mix.
> >
> > _____
> >
> > From: diesel_mercedes@yahoogroups.com
> > [mailto:diesel_mercedes@yahoogroups.com]
> On Behalf Of Nate
> > Sent: Monday, April 15, 2013 6:03 AM
> > To: diesel_mercedes@yahoogroups.com
> > Subject: [diesel_mercedes] Re: So. Cal. Car Show Sunday
> 4/14
> >
> >
> >
> > Yeah ;
> >
> > Not enough space to switch the hose else I'da done that
> 20 years ago .
> >
> > At the car show I met an old Friend who's English and
> was working on BMC
> > Products back when Mets were new , he suggested taking
> the drums off and
> > popping out the upper cylinder;s piston *just* enough
> to let the air burp
> > out then re assemble , he says that's how he's done it
> for over 50 years....
> >
> > Sigh .
> >
> > Sometimes being a Mechanic means doing things in a
> reverse order .
> >
> > When new , the cars were back filled with brake fluid
> from the bottom
> > mounted bleeder screws ~ seems counter intuitive to me
> but I don't make cars
> > , I just fix 'em decades later .
> >
> > -Nate
> >
> > ====================================================
> >
> >
> > Bill wrote :
> > >
> > > I saw a similar situation .somewhere. The previous
> owner switched the
> > > bleeder valve and the inlet hose, and it was
> working when I saw it.
> > >
> > > I have bled a 'hose higher', not a Metropolitan,
> by loosening the inlet
> > hose
> > > and using it as the "bleeder valve." Bill
> > >
> > >
> > >
> > > _____
> > >
> > > From: diesel_mercedes@yahoogroups.com
> > <mailto:diesel_mercedes%40yahoogroups.com>
> > > [mailto:diesel_mercedes@yahoogroups.com
> > <mailto:diesel_mercedes%40yahoogroups.com> ] On
> Behalf Of Nate
> > > Sent: Monday, April 15, 2013 5:46 AM
> > > To: diesel_mercedes@yahoogroups.com
> > <mailto:diesel_mercedes%40yahoogroups.com>
> > > Subject: [diesel_mercedes] Re: So. Cal. Car Show
> Sunday 4/14
> > >
> > >
> > >
> > > Because BMC wisely (?) decided to place the front
> brake bleeder screws 5"
> > > _below_ the hose connection so they're near
> impossible to bleed out .
> > >
> > > Still no joy , sigh .
> > >
> > > Usually there's a few (like three) Mets there ,
> this year not one .
> > >
> > > The show was TERRIFIC .
> > >
> > > -Nate
> > >
> > >
> ================================================================
> > >
> > >
> > > Bill wrote :
> > > >
> > > > Why not the Metropolitan? It's British. Bill
> in Oregon
> > > >
> > > >
> > > >
> > > > _____
> > > >
> > > >
> > >
> >
>
>
>
>
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