Quote:
Originally Posted by Rotmilky
Well, I replaced the ABS with a used one from a wrecked 2001 base. It had the same part number as mine (it's a 2001 S), so I figured it'd work. Installed it this morning, bled the brakes (and bled and bled and bled...there's a lot of air in the ABS to get out). Took her for a test drive and the brake pedal is back to normal. Woohoo! Nice to have normal brakes again.
Lucky thing there are a lot of used ABS units out there at a reasonable price (I paid $70). A new one from Porsche is about $3000.
So, if anyone happens across this thread in the future and has a similar issue. If a replacement master cylinder doesn't fix the brake fade, take a look at the ABS.
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I know this is an old post. But I'm going down this same path. A new master cylinder didn't fix it I'm going to do the ABS pump next. Another symptom is the rear pads wore faster than the fronts after some track use.