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brake light switches are in one of 2 places that I am aware of.. one is up above the brake pedal on the back of the mounting rod..the other is on the lines or near the master cylinder..if its on the pedal.. check the spring for return play and look to see if the switch mount(usually plastic) is broken..this will cause the lights to stay on..if its to be parked for a while disconnect the battery negative..keep from making the battery go dead..
Climb under the dash and look on the back of the brake pedal, brakelight switch will be on the back of the brake pedal arm halfway up the arm.
Look around in the floorboard and look for some fragments of rubber. If you see some fragments of rubber then the little piece of rubber that is attached to the back of the brake arm has probably fallen off. If the rubber piece breaks and falls off then the brakelight switch will stay on because it will be touching bare metal and grounding the switch making it stay on all the time.
And that seems to make sense because when you pulled back on the pedal the brakelights went off. Because you pulled the pedal back until it was not making contact with the switch anymore.
And the tach problem is unrelated. And im not sure about whats wrong with the tachometer. But I would suspect the vehicle speed sensor is faulty.
Your Brake Light Switch is Faulty or Damaged, You'll locate your Brake Light switch under the Drivers side dash,Attached to your Brake Pedal arm.
Its not an expensive Part Probally not over $10.00,
It has a couple wires running to it and is normally mounted on a small bracket, and has a nuts or a Clip holding it on to the Brake pedal arm.
This should get your Brake Lights out when your not pushing the brake pedal, While your under Dash ALSO make sure the Brake pedal return spring is Attached to the Brake pedal arm and is Pulling the brake pedal UP when its released.
Please let me know how my Solution helped you,By Voting on the Solutions i've given you.
the brake light switch has either moved out of the bracket just above the brake light pedal or the brake light switch itself is faulty.
look just above the brake pedal, there should be a switch on a bracket so that when you press the brake pedal the spring plunger piece of the switch moves out and the lights come on. make sure the plunger goes in when the brake pedal goes back to normal position.if the lights stay on when the plunger is pushed in the switch is faulty and needs changing, quite common. hope this helps
There's a little switch attached to your brake pedal, (In my old 9000 it was about halfway up above the pedal itself, haven't had that problem with my 9-3.... yet;) that can get gummed up and stick, making intermittent contact and also holding the lights on without pressure.
I just got up in there and cleaned it out really well with some WD-40. That seemed to exorcise the evil brake spirits pretty decently.