DoT standards are a "performance standard". They lay down the minimums and
maximums and the product has to meet those requirements. They do not specify
what it has to be made from.
Dave
Alan Richer/CAM/Lotus wrote:
> >Your brake system will be happy with any brake fluid that is rated DOT4.
> >Most auto parts store carries at least one brand of DOT4 fluid.
>
> I am very sorry to disagree but not all DOT4 fluids are the same. I have
> personally had hydraulic system failures from using a fluid that while DOT4
> was not Castrol - it promptly dissolved all my seals.Pyroil was the name -
> and I haven't used any other than Castrol since.
>
> Natural rubber seals (Girling and he like) require a fluid different from
> the standard American and European synthetic rubber seals. Specifically,
> the seals can't contain mineral-oil products else the rubber swells and
> dissolves.
>
> DOT ratings are for boiling, NOT chemical composition.
>
> ajr
This archive was generated by hypermail 2b30 : Mon May 07 2001 - 20:47:34 EDT