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For a Porsche, depending on which dealer you go to, they flush the brake fluid every 20,000 miles or two years.
For illustration only, here are the factory recommended service intervals for a Porsche Cayman S:
Engine Oil Every 10,000 miles or 1 year
Spark Plugs (Turbo Models) Every 30,000 miles or 3 years
Spark Plugs (6 and 8 cal / GTS Models) Every 40,000 miles or 4 years
Pollen Filter and Air Filter Every 40,000 miles or 4 years
Coolant Every 40,000 miles or 4 years
Brake Fluid Every 20,000 miles or 2 years
Brake fluid absorbs water from the air, and it turns to jelly. On a car with small brake servos and orifices for stability management and anti-lock, that would be very bad. Also dirt gets into the system via brake seals. Water can also cause rust and corrosion, also very bad.
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