You may have a bad power brake vacuum operated booster.
Perhaps a vacuum leak, Check all hoses
Most likely it is either the brake light switch, under the dashboard, connected to the brake pedal or the turn signal switch inside the steering column.
In this order only. Turn engine off. Depress parking brake. Turn engine on. Lights will turn off. To turn lights back on relase parking brake.
To reset the brake light on a BMW 645Ci, first, turn the ignition to the "On" position without starting the engine. Press the accelerator pedal three times in quick succession, then turn the ignition off. Start the car again, and the brake light should be reset. If the light remains on, check the brake fluid level and the brake light bulbs for any issues.
To reset the brake wear light on a 1999 Porsche Boxster, first ensure that the brake pads have been replaced and the wear sensors are properly connected. Then, turn the ignition key to the "On" position without starting the engine. Press the brake pedal several times to allow the system to recognize the new sensors. Finally, turn off the ignition and start the engine to confirm that the brake wear light has been reset.
Check the brake light switch, it's under the dashboard, connected to the brake pedal.
To reset the brake service light on a 2005 VW Polo 1.2, turn the ignition on without starting the engine. Press the accelerator pedal fully three times and then turn the ignition off. Start the engine, and the brake service light should be reset. If the light remains on, you may need to check for any underlying issues with the braking system.
To reset the parking brake warning on a Toyota Avensis, first ensure the parking brake is fully released. Then, turn the ignition to the "ON" position without starting the engine. Press the brake pedal and hold it, then press the parking brake switch down and hold it for a few seconds until the warning light turns off. If the light persists, consult the vehicle's manual or a professional mechanic for further assistance.
To reset the brake wear indicator on a Mercedes 320 CDI, first, turn the ignition to the "ON" position without starting the engine. Then, press the gas pedal three times within 10 seconds. After that, turn the ignition off and then back on. The brake wear indicator should now be reset.
To start a Mercedes C200, ensure the vehicle is in park (for automatic transmission) or neutral (for manual transmission). Insert the key into the ignition or, if equipped with keyless entry, have the key fob inside the car. Press the brake pedal and turn the key or press the start/stop button to start the engine. Once the engine is running, you can release the brake and shift into gear.
With the engine off, press hard on the brake pedal. Turn the engine on and the pedal should depress slightly but no more than an inch or two. If your brakes either drag or stick on, or sometimes the pedal goes real hard under foot it means your servo is shot!
I have the same problem- press on the brake, no brake lights. Press on the brake and pull back on turn signal/high beams lever, brake lights turn on! Jiggle the lever, brake lights turn on, but left turn signal does not work. I have replaced the switch that is down near the brake pedal and that is not the problem. I think you may need to replace the whole turn signal/high beams/cruise control switch....or at least that's what I'm going to try.