I seem to recall another thread with a complaint of a similar noise on hard braking. In that case it was worn engine/trans mounts that allowed the engine to shift forward and the fan was hitting something. Anyway, you might inspect the fan area WITH THE ENGINE OFF!! and see if there is any evidence of rubbing. And if I am right then you must send me beer.

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra