My 2001 996TT while upgraded for track duty is still my everyday driver. Every time I drive on the track I experience ABS & PSM failure. This happens when I go across curbs under power which induces severe inside wheel hop, but never on the street. I usually drive with PSM off, but there are still electronic nannies in operation, and I really like having ABS. It re-sets when I re-start the car.
Has anyone else experienced this, and is there a solution?

BTW: I managed to squeeze 275/35-18 Hoosier R7's in the front on Cayman rear 10" rims. Perfect fit inside and outside with lightly rolled front fenders, but fender liners are taking a beating so I raised the car a bit (easy with PSS 9's). The 275's are in reality not much wider than the 255's, but the 275's are the same diameter as the 315/30 rear tires.

 

Apparently its a worn brake master cylinder.

I have the same problem but haven't got around to replacing it yet as it only happens on the track, and i don't track that often as usually at sea.

There is an old thread here that ratifies my claim.

Cheers,
Tim

 

Disconnect the connector to the PSM pump. It's right under the brake master cylinder. Your ABS will remain operational.

 

Thank you. I will try this!

 

It's a pain at the track, even with my short experience tracking the car. I was going to do what John suggested as well and disconnect the PSM all together.

 

Just install a simple on/off switch in the front trunk in line to the PSM connector. Then it's easy to fully shut PSM off when at the track..

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