How often should the clutch and brake fluid be replaced?

 

See the owners' manual. It's on page 148/149 in the manual for the '00. Probably differs by a couple of pages on the manuals for other years.

 

Depends on the usage. Brake fluid sees more heat than the clutch fluid.

 

Manufacturers that recommend the change generally specify every two years, although many don't even list the need. Some race teams flush every event. Many of us that track the car will use a bleed each time pads are changed (or when needed on the track) instead of a regular flush.

 

Fluid replacement intervals also depend on the humidity in your area. Since brake fluid is hygroscopic, it absorbs water over time, reducing its boiling point and increasing corrosion rate on brake components.

Here in humid south Florida, I use 2-year intervals on street-driven vehicles. If your car sees track duty, it's best to do more frequent changes, approximately every 6 months with regular bleeding as needed to avoid a soft pedal.

 

I find Motul needs to be flushed sooner than ATE. Motul handles the heat better, and I prefer the way the pedal feels. There is a noticable difference IMO. But as CoralDoc points out, the more hygroscopic fluid will demand more attention. I usually do a full bleed after a pad change or whenever the pedal feels imprecise.