Your leak is most likely coming from your trunk.

I had the same problem with my 5th Gen.

Water gets in from either your tail lights (gasket was bad in my case) or your trunk seal, or maybe your sunroof drain tubes are clogged (not sure if your 92 has a sunroof or not). Check the bottom of your trunk where the spare tire is, I'd be willing to bet money that you have water there. Water pools in the trunk and then sloshes forward when you hit the brakes