Re: [ST] Tech Info

[Neil Lindsey <NeilLindsey@xxxxxxx>]

sorry, I'm not buying

sounds more like a botched brake job

Neil


- ----- Original Message -----
From: "Colt45" <colt4530@xxxxxxxxxxx>
To: <ST@xxxxxxxxxxxxxx>
Sent: September 30, 2004 7:44 PM
Subject: Re: [ST] Tech Info


> I saw DOT 5 swell the caliper piston seals in a Yamaha RD350 to the
> point the brakes locked on the first application after it had been in
> the system for minutes.  The caliper seals are the rubber that is likely
> attacked.
>
> Neil Lindsey wrote:
>
> >OEM Sprint brakelines ARE stainless-steel braided lines.  They are just covered in
rubber
> >so you can't see the braiding.
> >
> >DOT5 brake fluid is silicone-based and DOT5 was originally designed for military
vehicles
> >which are often left unattended for long periods of time.  It doesn't attack rubber.
DOT5
> >fluid is also not hydroscopic (it does not absorb water and will not mix with water).
> >It's only major advantage is that it doesn't attack paint, unlike poly-glycol fluids.
> >DOT5 brake fluid also has higher dry and wet boiling points, which means that it is
better
> >suited for extreme temperature situations.  However, since it does not absorb water,
any
> >water (which is heavier than brake fluid) that inevitably gets into the system will
pool
> >at the lowest points (usually the calipers) and when that water boils it will affect
> >braking iin the same way that moisture in hydroscopic brake fluid does.  It will, over
> >time, also cause corrosion of caliper pistons.  Also, as it approaches its boiling
point,
> >DOT5 fluid will become slightly compressible -- hence a spongy brake feel.  Lastly,
> >silicone and poly-glycol fluids are incompatible and should therefore never be mixed.
So
> >if you really want to switch to DOT5, you'll need to disassemble and thoroughly clean
the
> >ENTIRE system.
> >
> >So the recommendation against using DOT5 is correct, but not for the reason given.
> >
> >Neil
> >
> >
> >
>
> --
> John Albright
> '02 RS
> '00 748 "Rosetta"
> Chattanooga
> C-RATs
>
>
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