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 CR-V Faulty Master Cylinder Resevoir Filter Can Cause Brake Light After Cold Start
Honda CR-V Problem
Average Mileage: 131,727 mi (80,000 mi - 190,000 mi)
Visitor, 2001 Honda CR-V, 115,000 mi
brake light comes on intermittently.
Visitor, 2001 Honda CR-V, 120,000 mi
During cold weather brake light is lit on start up and goes off after 10-15 minutes of driving.
Visitor, 2000 Honda CR-V, 80,000 mi
brake light on upon morning start then off after several minutes. auto shop ruled out everything else.
Visitor, 2001 Honda CR-V, 123,000 mi
Brake light stays on, even though the hand brake is off(down). It goes off once the car has warmed up.
Visitor, 2001 Honda CR-V
I have this same light problem
Visitor, 1999 Honda CR-V, 102,000 mi
when car has started the brake light stays on til i start driving then goes off
Visitor, 2001 Honda CR-V, 175,000 mi
Brake light comes during cold weather start, then goes off, never happens in warm weather.