[ROVERNET - UK] Brake hook-up

Paul Smith vmitps at netspace.net.au
Sun Apr 22 06:24:11 BST 2007

You assumed a volume that precludes surface tension effects.
The bubbles will move Down through a small volume.  Brake pipe bleeding
relies on this.  It works on the rear calipers.
The book Does show it, just not closeup, see P.70.25.02 in the P6B manual
fopr the bleed nipple, and 24L in the 2000 manual for showing the whole
system, with the caliper link pipe clearly exiting from Below the entry pipe
to the RH caliper.

One day I will measure the voltage on the headlights...

----- Original Message ----- 
From: "Fletcher" <gofanu at usachoice.net>
To: <rovernet at lyris.ccdata.com>
Sent: Sunday, April 22, 2007 2:45 PM
Subject: [ROVERNET - UK] Brake hook-up

> Guys-
> Odd that Rover doesn't show how to hook up the pipes, maybe they figure
> you can figure it out!
>  The simple fact is that it's just physics; regardless of how it "was"
> or is "supposed to be" -- there's only one thing that works. Any pocket
> that is closed at the top will hold air and therefore cannot be bled -
> there must be a top exit port.
> ***This means that fluid has to go in low and come out high.***
>  So, for a single bleed screw system with two cylinders, the fluid goes
> in low, exits high, enters the other side low, and exits high at the
> bleed screw.
> It is expected that all of these cars today have been apart and had many
> things changed, DO NOT assume that "how it was" is even close. Fittings
> can be very misleading; ports are commonly machined with tools that make
> one type of port that is suitable for multiple different fittings, and
> these things are not necessarily reversible. Bleed screw ports are the
> same thread and sometimes the same bottom configuration as the threaded
> hose or tube end ports. One common port is for the round nose long
> 3/8-24 hose end or male tube/bubble flare nut, but is more often used
> with a short 3/8 -24 copper gasket sealed hose, or banjo bolts with the
> same copper gaskets,  at caliper and other cylinder ports. There are
> similar and perhaps more common tapered end/double flare hoses, which
> will deform to round end in a round bottom port. . There are inverted
> flare pipe ends that use the same male nut as double or bubble flare
> fittings. This can confuse the hell out of you, but it can also be used
> to advantage when forced to make do - which again leads to mystery the
> next time round.
> There are in fact a few demented systems which do not follow these rules
> - though it's usually a case of the wrong but similar parts fitted, and
> they are a PITA to service; if you meet this particular Buddha in the
> road, definitely kill it.
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6:43 PM

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