copper brake pipes

["jsadowski" <jsadowski@xxxxxxx>]

Copper tubing is very soft & a panic stop may be all it takes to rupture a line

John

----- Original Message -----

From: Leo Jormanainen

To: mailing-list@xxxxxxxxxxxxxxxx

Sent: Friday, May 31, 2002 8:08 AM

Subject: Re: IML: copper brake pipes

Hi,

It doesn't need any calculations, copper tubing in any brake system
is dangerous and illegal here in Canada.

Leo
QCI





At 09:52 AM 31/05/2002 -0500, you wrote:
>At 02:52 AM 5/31/2002 -0400, you wrote:
>>I
>>have never had a copper pipe rupture and I have had plenty. Is this risk
>>particular to heavy U.S. cars? If so I will ensure that the replacement pipes
>>are steel.
>>
>>Tony V.
>
>Tony, I am not sure if Imperials have particularly higher brake line
>pressures than your usual car in Britain.  I think that the higher brake
>forces are achieved by using larger calipers, brake cylinders, and master
>cylinders rather than higher pressure.  Also, drum equipped cars like
>yours have inherently lower line pressures.  I would guess the shop manual
>will help with the question of how high pressure is built up inside the
>brake system.  If I recall, on a 68 (disk brakes) the pressure can reach
>1200 psi.  Now, does copper have sufficient strength?  Well, some of these
>pipes (flexible hoses) are actually rubber, so if rubber can take the
>pressure, then copper should too.  Of course, the rubber hoses are of much
>higher thickness than the steel lines to limit expansion.  Then again, we
>do not know how thick wall the copper lines used in the UK are.  They
>might be of thicker wall than the steel lines used in the US.
>
>Calculating the stresses in a pipe based on pressure, pipe ID and wall
>thickness is not difficult.  If you can provide me this information, and
>the copper alloy used (I can hopefully find info on the strength of the
>material) I may be able to do some rough calculations and tell you if the
>material selection is improper.  My guess though is that if they use it in
>a large scale over there, it should be fine.  Here in the US, often the
>"safety" regulations go beyond sense...
>D^2
>
>
>
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