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Check the brake light switch on the brake pedal. Sounds like it slipped out of adjustment. When pedal is depressed, the button on switch will extend and be on to pass current to the bulbs.
Also, you need to figure out the tail lights: those two filament bulbs are for park lights and for brakes/turn signals. One filament is for the parks, the other filament is for both brake and turn signals. American cars have the brake lights wired through the turn signal switch- from the brake light switch on the brake pedal to the turn switch, and then out to the rear bulbs for brakes and, or turn signals.
If some of the lights work then you probably don't need to change the light assembly. My first guess would be a burnt out fuse. Look for the fuse box and remove the cover. Usually on the inside of the cover it will have a diagram for all the fuses and you can find the one for the brake lights. Some vehicles have relays that are fried and these may be under the hood. Just look for a black box which contains electrical relays and other fuses. The last thing I can think of is a switch that is right above the brake pedal. When you apply the brake a small plastic or metal extends and this is what makes your brake light come on. www.lightdeal.co.uk
Check the brake light switch on the brake pedal. It may need adjusting to allow brake lights to go off. The plunger on the switch needs to open when pedal is depressed, and close when pedal is released and in its normal position.
does the high mounted brake light work? the brake switch has 2 contacts one for the high mount (LT BLUE/BLACK) and one for the tail brake lights. The tail/brake light wire is LIGHT BLUE. the main connector between the brake light switch and the tail lights is C208 which is located behind the rear seat, left side. So if there is power coming out of the brake switch OK and no power at the tail lights, check that connector. Hope this helps.
have you checked for blown fuse under dash in fuse panel? if so, are brake light bulbs blown ? if not, check on brake pedal for bad brake light switch, it will be above the brake pedal on the arm assembly, look for a black switch that has wires running to it, it may only need adjustment. it has a plunger type switch, when it moves the brake lights come on, when it closes the circuit, the lights go off..hope this helps and thank you for choosing fixya.com!!
If you have a meter.... check the bulb socket for 12V DC with someone applying the brake or watch for a 12V DC pulse on the meter when the meter leads are on the socket contact with the emergency flashers on. (+) lead to socket contact and ( - ) lead to chassis ground. If you have the 12V DC on the socket contact then there is a problem with the chassis ground wire.
The brake light socket has 2 terminals. One is for the tail light 12V DC power when the headlights are on and the other one is 12V DC only when the brake lights are supposed to be on. (i.e pulse hazard or brake applied light on)
Also check the BRAKE light fuse in the fuse box located on the front of the left kick panel wall drivers side with a black cover. (4" x 2.5") There is also a fuse and relay box on the left side of the engine compartment. (4" x 7")
The wire color connected to your NEW brake switch that leaves the switch for the tail lights is the same color on the rear of the car and terminates at the tail light assy quick disconnect connector.
The alarm system usually uses the parking lights, not the brake lights so you'll have to test the brake light system. If your car did use the Brake lights absolutely,,, then your brake lights would be good & that would generally mean it's the fuse or the brake light switch.
I suggest that you check the fuse first with a 12 volt test light or multimeter, if it is good with current coming through, you'll need to test the brake light switch,, it's located just above the brake pedal, with the brakes applied you should be getting voltage at both terminals (my chart shows those wires as black/white) if so, then it must be the bulbs.
there are a few other options but this is the basic brake light system.
I had the same problem with my 2004 TL, and it was the brake light switch. It is very easy to replace. (10 min) I ordered one from Rockauto.com for only $6.95. To replace: Remove the black cover under the steering wheel, down by the fuses (held in place by rubber pins and clips - no screws) Locate the switch on the arm of the brake pedal. Unplug the switch, twist the old switch out and install the new one - it's simple!