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A leak in the braking circuit is a likely cause.. Brake fluid leaking from a poorly tightened joint etc - will cause the level in the reservoir to fall - causing the sensor to trip the warning light.
brake light bulb out
No, it more commonly causes soft braking.
Because the e brake is hooked into your braking system and that system has a problem.
The vehicle does not monitor the amount of brake life you have left nor does the red BRAKE warning light indicate that pads and rotor need replacement. The red BRAKE warning indicator is meant to warn you when there is a dangerous hydraulic problem with your braking system. Take the vehicle to a professional, who know how to service an automotive braking system. On a vehicle with brake pad wear sensors, if the sensors are new, then you have a broken wire.
It is possible that a wheel speed sensor is bad. This will cause the anti lock braking to not read the wheel correctly which would be a brake problem that would cause a light.
Low brake fluid possible
Both are indications of trouble within the braking system. That's what warning lights are for. You will need to take the vehicle to a shop or the dealer to get the problem diagnosed.
Check your brake fluid level and your brake pads and or shoes for excessive wear. Or take it to the brake shop. Either way not a good thing.
Check your brake fluid level in the brake master cylinder in your engine compartment when it is low your brake warning light will come on
Brake pads up to 40k depending o how you drive and use your brakes. Rotors closer to 80k depending on your braking style. Listen for squeaking when braking, and pulsating while braking, as well as watch for your brake warning light coming on the dash. Any of this will tell you your brakes need servicing.
If you mean the warning light that shows BRAKE and has the exclamation mark underneath it that means either your parking brake is on or the brake fluid level in the brake master cylinder in your engine compartment is low