[ROVERNET - UK] Brake hook-up

Fletcher gofanu at usachoice.net
Sun Apr 22 06:44:50 BST 2007

Dint either! I know it works on pipes, I was talking about large 
volumes, i.e. calipers; and that is implicit in my description of the 
interconnect pipe as "...exits high, enters the other side low...".
I got 24L --( "clearly" exiting from below the entry pipe)  -- is 
clearly a hell of a stretch! Given the effects of perspective, angles, 
and the like, I don't get any clear sense of the position in vertical 


Paul Smith wrote:

>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
>>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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