Question about 1990 Ford Thunderbird

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No brake lights at all

I replaced the brake pressure switch, and the fuse is good.

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You probably have a Short in your wiring under the carpet by the Driver door running back to your lights

Posted on Jun 22, 2009

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Lumina troubleshooting


Check fuse.
Check if center light works.
Check for power at light sockets.
Check brake light switch.
Manipulate the turn signal lever.


- To check the brake light fuse, open the passenger door and remove the fuse panel cover that is located around the corner from the glove compartment. On the back side of the fuse panel cover there should be a fuse location chart. The brake light fuse is #23, located in the socket that is dead-center among the mini fuses. I believe it is supposed to be a 15A fuse. Confirm the condition of the brake light fuse and replace if necessary. If the fuse fails again, determine and correct the cause.
- Also, see if the center brake light is working properly. If it is, then the brake light switch is working. If the center light is not working, the brake light switch is suspect. That switch is a spring-loaded plunger switch that is of the "normally closed" variety. In this application the switch is usually held open by the brake pedal arm, except when he pedal is depressed. Then the spring within the switch holds the contacts closed so that the brake lights will operate.
That switch is located under the instrument panel. Look for a push-button switch that is contacting the brake pedal lever. If the car has cruise control there will be two switches, one above the other. I believe that the lower of the two is the brake light switch.
- With the brake pedal depressed, see if you have power and ground at the brake light sockets. One good way to confirm that is to remove a brake light bulb and connect a 12v. test light across the contacts in the socket.
- An operating center brake light combined with no power to the 12v+ terminals at the left and right brake light sockets could indicate a defect within the turn signal switch. If you get to the point where you suspect a defect there, try applying rearward pressure on the turn signal lever and see if the brake lights work then. If that procedure confirms that the defect is within the turn signal switch, you can replace the turn signal switch. Or you could try my trick which cost me less than a dollar and has worked for years.
See attached photo.

Spacer (piece of rubber tubing?) is used to apply rearward pressure on turn signal lever. I have not disassembled the switch assembly, but evidence suggests that electrical contacts inside the switch depend on the mechanism being positioned properly. If the internal positioning device failed (perhaps the lever was pushed forward) then an external device can be made to hold the lever and switches in proper location.
If you attempt this repair, consider applying some lubricant as deemed necessary.
Good luck.

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Aug 30, 2014 | 1998 Chevrolet Lumina

1 Answer

All the elecrical cuts out while acclerating. Lights, heater motor, emmissions light comes on. Once I get to speed everything goes back to normal. Ehgine has just started misfiring, seems to cut th


Here is something that might be related to your issue, carefully inspect fuse box under dash, driver side. See if it is wet/moist with oily liquid on fuse side and wire side behind. If it is, its brake fluid from the brake master pressure switch that has failed causing brake fluid to be pushed thru the wiring all the way to the fuse box , shorting out the electrical system. The repair would require replacing the brake master pressure switch with an updated pigtail (supplied with new switch), and replacing the complete fuse box assembly, and I would recommend cutting and splicing new wiring from the brake pressure switch to the fuse box.

Dec 27, 2013 | 1998 Ford F150 Regular Cab

1 Answer

All my lights work except my brake lights, fuses are good and changed all bulbs and brake switch and still no brake lights.


You haven't mentioned what type of car? No matter, the brake lights have no fuse. They're hot all the time. If you have a line tester (one of the little lighted ones) check for power at the brake light switch. It could be on the brake pedal or a pressure sensor screwed into the master cylinder. The turn signals (on most cars) are the brake lights so the wires and lights are all ok. Your trouble has to be in the brake light switch or the power going to it.

Nov 16, 2013 | Cars & Trucks

1 Answer

Brake lights wont work when pressure is applied


brake switch needs adjustment if it works with slight pressure on the pedal readjust it where it needs to be..

Feb 09, 2013 | 1999 GMC Yukon

1 Answer

Have a 1999 Chev. Suburban. Problem is with brake lights. Top panel (on roof) works but neither side panel works. Replaced circut boards in tail lights, new bulbs, and all fuses are good. What next?


WITH A GOOD FUSE TESTER, TEST ALL THE FUSES FUSEBOX UNDER THE HOOD & INSIDE THE VEHICLE. IF THE FUSES ARE ALL GOOD WITH THE TESTER YOU MUST HAVE A BAD BRAKE LIGHT SWITCH OR A BAD TURN SIGNAL SWITCH. THE BRAKE LIGHT CIRCUIT GOES UP THROUGH THE TURN SIGNAL SWITCH & THEN TO THE BRAKE LIGHTS. FIRST OF ALL IS THE BRAKE LIGHT SWITCH GOOD ? THE ORANGE WIRE FEEDS THE BRAKE LIGHT SWITCH, THE WHITE WIRE PUTS POWER TO THE TURN SIGNAL SWITCH, SO THE LIGHTS CAN BE USED AS TURN LIGHTS OR BRAKE LIGHTS. , PUT A TESTER IN THE WHITE WIRE & PRESS ON THE BRAKE PEDAL. IF THE TEST LIGHT LIGHTS UP, BRAKE LIGHT SWITCH IS GOOD, BY THE WAY THE BRAKE LIGHT FUSE MAY BE LABELED" STOP", THE FUSE LABELED" BRAKE" IS FOR THE ABS SYSTEM. TO CHECK THE TURN SIGNAL SWITCH FOR BRAKE LIGHTS, REMOVE THE PLASTIC COVER FROM UNDER THE STEERING WHEEL, PRESS ON THE BRAKE PEDAL, PUT THE TESTER IN THE SMALL YELLOW WIRE, THEN THE SMALL GREEN WIRE. IF THERE IS NO POWER IN EITHER WIRE, THE TURN SIGNAL SWITCH IS BAD.

Jan 11, 2011 | 1999 Chevrolet Suburban

3 Answers

I have a chevy colorado 2007. The "serv tpm" light


TPM THAT MEANS TEMPOMAT CRUISE CONTROL.CHECK TO SEE IF BRAKE LIGHTS WORK.IF NO CHECK BRAKE LIGHT SWITCH FUSE. IF FUSE OKAY BRAKE LIGHT SWITCH FAULTY OR YOU HAVE OPEN WIRE FROM BRAKE SWITCH TO FUSE BOX.SEE YOUR BRAKE SWITCH DEACTIVATES THE CRUISE CONTROL SYSTEM.PROBLEMS WITH BRAKE PEDAL POSITION SWITCH WILL SET OFF CRUISE CONTROL WARNING LIGHT.IF BRAKE SWITCH OKAY.THE DEALERSHIP HAS TO DIAGNOSIS AND FIX PROBLEM.

Dec 03, 2010 | 2007 Chevrolet Colorado (Extended Cab) New...

1 Answer

No brake lights! Fuse is fine, brakes work fine, bulbs are fine, all other lights work. Where do I find the pressure activated switch to the brake lights?


are you sure the fused is good , bulbe good
, - check in the trunk to see is the wire connector is disconnected. will if not , look wher the brakes peddle is , there is a switch there , disconnect the wire connetion and check to see if you have power at both side , now there must be power on one side , used a wire and bridge the connection , check and see it the brakes light is on . if on , then you know that the brakes switch is bad, reply

Aug 01, 2010 | 1995 Buick Regal

2 Answers

No brake lights but fuse is good. Wiring appears okay.


Isnt there a switch on the brake pedal inside under the dash? There should be power going in and out when depressing the brake pedal. If there is a pressure switch, then check it when the brake pedal is up and then depressed. it should have power on one side up, and both when depressed. One thing to keep in mind that I think it goes through the turn signal switch, so if blinkers work, that tells you the wiring is good to the lights, so concentrate on power getting to and out of the turn signal switch.

May 12, 2010 | 1999 Ford Super Duty F 450

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