When I had my PPI done they also said to have the brake fluid flushed. Your explanation gives a good reason for doing it. HOWEVER, I would like to point out that my 14 year old Miata with 130,000 miles on it never had the fluid flushed and never had a brake problem. I can say the same for my 16 year old Mercedes (one of the original ABS cars). As a matter of fact, this Porsche is the first car I ever owned that I have heard the recommendation to change the brake fluid so frequently. Why do Porsche's need this more often than other cars?
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Originally Posted by MNBoxster
But, in addition to becoming moisture laden, Brake Fluid (primarily Glycol esters) will react with the metal in the system, Copper in the Brake Lines in particular. This reaction leaches Copper Ions from the metal which will react with the Oxygen and attack the Ferrous parts. ABS increases this effect because
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