Hello,
Thank you for all your replies!
I've done some further research on the web about the corrosiviness (does this word exist in english?!? whatever... I think you get the picture
) of Brake Fluid.
As far as I could understand, DOT3, DOT4 and DOT5.1 brake fluids are polyglycol based and consequently corrosive to paint. The DOT5 on the other hand is sylicon based, and does not present problems of corrosion when in contact with painted surfaces (but may present other drawbacks such as spongy feel on the brake pedal).
My question is: Is it possible that my PORSCHE dealer is using DOT5 brake fluid in my Boxster?
I would find it very strange, since it seems that DOT5 fluids are a lot more expensive than the other DOT3/4, and even 5.1, more common fluids, and that it would demand a complete and throughful bleeding and cleaning of the entire brake system since no mixture between these two class of brake fluids is advisable! I also read that some of the rubber sealants of the braking system may not be sylicon compatible and may start to degrade while in contact with DOT5 fluids...
On the other hand, DOT5 fluids seem not to be regarded as regular brake fluids, apparently being only used on specific situations where corrosion can be a major problem (e.g. Military vehicles that are parked for long periods of time, or in car museums or collections).
I got this information from several sources in the web, and so I'm not sure if I got the whole and correct picture...
Any comments?
Once again thank you for your time!
Best Regards,
Gustavo
Corrosive or not Corrosive? This is the question!
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