It turned out the coupling for the trailer lights was all corroded. It didn't work to just clean it, we had to entirely disconnect it. Works fine now.
Most brake light switches ratchet into position and self-adjust. To reset the adjustment, press the brake pedal part way down & pull the switch out toward the pedal until it clicks several times.
To reset the brake warning light on a Porsche 928, first check and ensure that the brake fluid level is adequate and that the brake system is functioning properly. If the fluid level is correct and there are no issues, turn the ignition to the "on" position without starting the engine. Then, press the brake pedal several times; this should reset the warning light. If the light remains on, it may indicate a deeper issue that requires professional diagnosis.
My 1992 Honda Accord Brake Lamp came on several times after I had the Master Cylinder replaced. Turns out the fluid had gotten low. Once I refilled the fluid level, the light stopped coming on.
Your brake light switch is out of adjustment. Don't know what vehicle you have but most brake light switches are located on the brake peddle lever just above the brake peddle pad.
I don't know the why, but just spray the connection with electrical cleaner. I had this same problem w/right brake light on my '98. I had to clean the connection several times in a couple of years, then it stopped. Haven't had a problem with it in years now.
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.
most times if brake lights are stuck on you have a bad brake light switch on pedal under dash
It is possible that one of the bulbs is shorting out. Try replacing the brake light bulbs, if that doesn't work, troubleshoot the brake light switch.
Probably because of a BAD ground. If you have 12 Volts to the light, then the light isn't grounded properly. yes sir bad ground
There is a brake light switch on the back side of the brake pedal some times they stick with wear inspect that first.
It could be the turn signal switch.
The brake light fuse could be open,in that case you may have a short some where. The brake light switch or wiring could be defective. Some times when an autostart is wired in to the brake light switch the wire is weakened and breaks. The brake light switch operates a small solenoid which disengages a latch to allow the shift lever to be moved. Hope this helps