When the parking brake light is flashing, it is important to make sure that the parking brake is properly engaged and that the vehicle is properly parked. If the parking brake is not properly engaged, the vehicle may roll away and cause an accident.
If the parking brake light is flashing and you are unsure of how to release the parking brake, you should consult your vehicle's owner's manual. You should also consult a mechanic if the parking brake light stays illuminated after engaging the parking brake.