A faulty brake master cylinder reservoir filter can cause the brake system indicator to illuminate after a cold start and then go off. Replacement of the reservoir filter will commonly fix this problem.Google+
Car Problem Reports
Honda Prelude Faulty Master Cylinder Resevoir Filter Can Cause Brake Light After Cold Start
Honda Prelude Problem
Average Mileage: 98,500 mi (84,000 mi - 113,000 mi)
Visitor, 2001 Honda Prelude, 84,000 mi
Brake light on and emergency brake NOT being used. Happens most frequently when the temperature is cold.
Dealer repaired....but light still on.