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Check the brake switch under the pedal. The other switch you can check is the one controlled by the emergency brake lever. And also check to make sure that the brake fluid is up to specs or the light will go on.
That would eventually cause the battery to go dead.
I'd suggest you charge the battery and try temporarily removing the wires from the brake light switch. See if the problem continues. Do not run the vehicle on the road without functional brake lights. UNSAFE, and ILLEGAL.
WHEN YOU SEE BOTH LIGHTS AT THE SAME TIME YOU ARE HAVING BRAKE FAILURE EITHER MASTER CYLINDER FAILING OR ABS BRAKE MODULATOR FAILING.CHECK BRAKE FLUID LEVEL IN BRAKE MASTERCYLINDER. IF BRAKE FLUID LEVEL OKAY. I HAVE SEEN CASES WHERE ALTERNATOR FAILING CAUSING BATTERY VOLTS TO DROP AT 11.8 VOLTS CHECK BATTERY VOLTS AT BATTERY WHILE ENGINE RUNNING SHOULD BE 13.5 TO 14.5 VOLTS AT BATTERY WITH ENGINE RUNNING.IF BATTERY POWER IS OKAY.MORE LIKELY BRAKE MASTERCYLINDER AND ABS MODULATOR COULD BE FAILING. TAKE VECHICLE TO A GARAGE LET THEM CODE SCAN TO SEE WHAT CAUSING ABS AND BRAKE LIGHT TO COME ON.CODE SCANNING WILL SAVE YOU TIME AND MONEY.
if u have an electric trailer brake controller fitted try disconnecting it as sometimes the battery feed to the unit can randomly backfeed the brake circuit causing your symptoms
Try pulling your brake pedal up and see if that causes the brake lights to turn off. The problem is most likely a bad brake switch that fits up under your dash and is attached to your pedal, it may not be releasing right and causing your lights to stay on. Hope this helps. Let me know how it goes and I will see if I can help some more if needed...
door pins may be bad, you doors may also be sagging at the hinges causing a bad connection, your lights will dim when you brake because of a draw on the battery, but it sounds like your pin switches are bad
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