@vladsc50 , The brake light in the instrument cluster will light up when the balance of pressure from the front brake system to the rear brake system. In the lines leading from the master cylinder, there is a pressure differential valve.
PRESSURE DIFFERENTIAL VALVE
The pressure differential switch is connected to the brake warning light. The switch is actuated by movement of the switch valve. The switch monitors fluid pressure in the separate front/rear brake hydraulic circuits. A decrease or loss of fluid pressure in either hydraulic circuit will cause the switch valve to shuttle to the low pressure side. The movement of the switch valve lights the brake warning lamp.
Once the pressure equals out the switch will return to normal. This will probably require bleeding the front and back brake hydraulic circuits. Be careful not to let the fluid in the master cylinder run out when bleeding, as that will introduce air into the system at the very beginning and will be very difficult to remove. When you are done bleeding the light should go out. If not, the pressure differential valve may need replacing. Hope this helps.
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Have you checked the handbrake?
von S W
Have you checked your fluid level, as that is what the brake light usually represents in older cars.
Sorry for the long reply but it turns out I fixed it by accidentally pressing the brakes too hard and then the BRAKE light in the dashboard shut off. Now whenever I start my car the light turns off.
Thank you guys for the help. I'll keep your answers as future references jist in case. Thanks again.
I have a 1996 Toyota T100
My dash brake light was on, constantly, since I replaced my front disk brakes completely - all new parts!
I fixed the problem by remembering a stupid fix I had read about a few years ago!
Believe it or not... it was due to my brake's master cylinder reservoir being filled up to the MAX line! REALLY?!
So I drew out the brake fluid from the reservoir until it was half way between the MAX line and the MIN fill line. Problem solved!
The brake light will also come on and remain on if your emergency brake cable is stretch out. If you readjust it or install new emergency brake cable then the light will go off.