Just to clarify... by suggesting examining a piece of Aeroquip line in the
note below, I meant a piece of raw hose which does not have a hose end on
the end being examined. Unless you make your own hoses you may not have
access to this. If you go down to a supplier of SS/teflon hose and hose ends
you will be able to check it out there.
I think the reason the outer SS does not abrade the inner teflon layer is
that the two layers are a pretty close fit over the length of the hose. But
they are not bonded to each other, at least not hoses I used for my oil
pressure gauge line and clutch flex line (Aeroquip TFE Racing hose in sizes
-3 and -4). If you read the directions for installing reusable hose ends on
the high pressure hoses you will see that there is no real magic to
assembling the hoses. At least not the hoses with reusable ends. The
pre-made hoses have "crimped" ends which require a special machine to form
the crimp. For the reusable hose ends all you need are: hacksaw (!),
electrical tape, vise and the appropriate standard sized wrenches. Look in
any Aeroquip, Earl's, Goodridge catalog or the Pegasus catalog if you have
one of those for more info.
--- Peter Zaborski CF58310UO ---
> From: Peter Zaborski [mailto:peterz@merak.com]
> Sent: Monday, May 10, 1999 10:25 AM
>
> > From: kehrlich@dyax.com [mailto:kehrlich@dyax.com]
> > Sent: Monday, May 10, 1999 9:52 AM
> >
> > ...a few people are militantly against SS hoses because
> > road grit, dirt, salt ( if you are out in the winter) allegedly
> > gets through the braiding as it flexes with the normal
> > suspension travel. This stuff then acts abrasively internally
> > against the thin rubber or teflon hose beneath such that
> > you can end up with a perfectly clean looking hose on
> > the outside that is or is about to be leaking internally.
>
> I am not sure what the militants from the high mileage list
> are referring to here. Here is my layman's take on this
> matter. Examining a piece of Aeroquip TFE Racing hose
> you will observe that it consists of two layers. Inside is
> the teflon "tube" which forms the fluid containment layer.
> Outside is the SS "sheath" which forms the outer protective
> layer. If the teflon layer is leaking, I cannot see how the SS
> layer can contain the fluid. Especially brake fluid which is
> at pressures greater than 1000psi. Thus any leakage
> should be evident in a visual inspection of the hose.
>
> Of course I am assuming the car is not driven in an
> environment where the hoses are so covered with road grit
> , dirt and salt as to make a visual inspection useless.
>
> Note: I am not an authority on SS/teflon lines. I have them
> on my car for the brakes, oil pressure line and clutch hose.
> I keep them clean and inspect regularly.
>
> --- Peter Zaborski CF58310UO ---
>
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