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Originally Posted by Adam
That's not true, as the clutch disc and brake pads wear the fluid level in the master cylinder will go down and adding some quality dot 4 fluid is fine. Also, once a year flush is too often unless you are doing track work on a regular basis. For standard driving, a flush every two years is more than enough and what Porsche recammends.
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If you ever let your brake pads and rotors get worn to the point that you're adding a significant quantity of brake fluid, you should be worried about a lot more than your brake fluid level. The Boxster's master cylinder reservoir is HUGE as anyone who has done a fluid flush will tell you - it would take an obscene amount of pad wear to lower the level enough to require adding fluid. That said, obviously it should be checked regularly just like any of the fluids.
I would suggest to anyone who thinks that flushing the fluid once a year is sufficient (for year-round driven vehicles) to do a brake-fluid condition test after a year's use. You'll be surprised at how much water the fluid absorbs in normal use. With how expensive calipers are and how cheap and easy a fluid flush is, it's cheap insurance.
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