Brake/parking light problem?

I have a ford fiesta 1.2l year made 1999 recently i have noticed that my brake light comes on while driving it dosent affect the driving of the car i thought it may be the brake fluid but its fine over min but under max what els could this be?

Added (1). the light is on the dash bord (handbrake) not out side lights

Added (2). would i be able to check brake pads ect with out removing wheel

Brake light switch at the top of the brake pedal arm. It may be faulty or need adjustment.

If the brakes are working as they normally do it's either the sensor in the brake fluid reservoir turning the light on or the emergency brake was used and the cables didn't allow the brake to turn off all the way. Try unplugging the reservoir sensor and then start the motor and see if the light goes out. The light will be on if you just turn the key to the on position so you need to start the motor to make sure that unplugging the reservoir sensor turns the light off. I wouldn't even bother plugging the reservoir sensor back in if unplugging it turns the light off. It's not really doing anything that matters. If the brake fluid gets low it's because the brake pads need replacing and people hear the grinding before the reservoir sensor light goes on.

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