Brakes failed and unable to recreate the problem, what to do?

[anson]

I drove my 97 boxster out of the parking lot at a slow speed, about 10 mph. I pressed on the brakes, the ABS pulsated the pedal and my foot pushed the pedal to the floor. I pulled the emergency brakes and the car stopped. When the cars at the cross way passed, I tested the brakes again and again and was unable to recreate the problem.

The dealership whom I had a tune up with 6 months ago couldn't recreate the problem nor find any leaks with the car--no ABS error logs in the computer, no brake fluid leaks.

They suggested several possibilities:
1. Did I press the clutch instead of the brake. (Nope, they're miles apart; it is unlikely.)
2. Perhaps a problem ABS computer, a bad master cylinder, or bad lines. (There is no sign of brake fluid leaks on the cylinder or lines and the dealer claims they have never seen a case where there was a bad abs computer)

Thus, if they had to change anything, they would change the master brake cylinder, even though there is no visible sign of problems with it.

Has anyone had this problem with thier car? I feel I am throwing money at the problem without being able to verify the cause? Would you just drive it at safe distances and try to recreate the problem and if it doesn't happen again, second guess yourself by assuming that you pressed the clutch?

Thanks,

J