1982 911 sc brake light on, replaced pressure switch but light still on. mechanic says its not the e-brake switch. then what???

Check the fuel pressure and flow, if the flow is low replace the fuel filter, if the pressure is low,check the fuel rail pressure regulator , if ok replace the pump. The throttle position switch may also cause this fault. The brake pedal works the stop light switch on most systems, make sure the pedal engages the switch when the pedal is at rest. Some cars have a in line pressure stop light switch , replace this if faulty .

If its a mechanical switch its on a bracket at the top of the brake pedal arm , if it is a pressure switch it located in the brake oil line near the master cylinder.

If your turn signals work but your brake lights do not, I would be looking at the actual brake light switch. It may be pressure operated or it may be a mechanical switch near the brake petal. I am not familiar with your particular veheicle. Your brake light has to have a switch and these are the only two types I am familiar with.

When you locate the switch, short out the two wires to see if the lights do come on. If they do, replace the switch.

Normally, in many vehicles, the actual filament of the turn signal is the same filament for the stop lights. Your actual tail lights MAY be in the same envelope (glass enclosure) as your brake filament, which doubles as your turn indicator.

I hope you find this information helpful. Thank you for your interest in FixYa.com

Hi, if it's not a fuse or the switch, it must be the wire or connector. Check first for power at the switch. If power is there, check for power at the connector SC-03 (with brake pedal depressed). Then the connector SC-08, etc.. Note, if your shifter is coming out of park, it is likely you have power to connector SC-08. Then the problem would be that connector itself. You can find that connector by tracing the wires from the center stop light. Please let me know if you have questions, and thanks for using FixYa.

When a vehicle's brake lights all go out at the same time, the culprit is usually the
"stoplight Switch" which is operated by depressing the brake pedal.

To replace a stoplight switch, first determine what type of switch you have.
If you have an electrical switch mounted to the brake pedal in the passenger compartment:

• Unscrew the switch.
• Unplug the wires.
• Replace with a new switch. Adjust as needed.
• Plug the wires back in.

If you have a hydraulic pressure switch that is mounted in the brake master cylinder:

• Mark and disconnect the wires.
• Unscrew the switch.
• Screw the replacement switch in.
• Reconnect the wires

Here's a picture of the "Stoplight Switch", aka Brake Light Switch - 1995 GMC K1500 Sierra



Brake lights (stoplights) are activated by a mechanical switch on the brake pedal.
To test a suspected bad stoplight switch, bypass it with a jumper wire. The stoplights should light when the wires are connected. Use the test light to see if there is power at one of the lights.

• If the lights come on when the wires are connected but not when the brakes are applied, replace the switch.
• If the stoplights operate without the key on, remove the stoplight fuse before removing the switch.
• If the new switch is adjustable, adjust it so that it is open when the pedal is released.lights should come on about 1/4" after the pedal is applied.

possible issues could be brake light switch not working, bulbs could be burnt, broken wire to rear lights

check brake switch above brake pedal. Try removing the connector to see if lights will go out. If yes, replace switch.

You may have a bad brake light switch the release actuator get power from brake light switch, step on brake pedal and have someone check for brake lights if they are not on then check fuses if fuses are all good replace the switch, hope this helps.

I have the same problem I suspect the circuiut that involves the criuse control as cruise will not disengage on tapping of the brakes and thence the brake lites are out again.

Brake lights are controlled by one of two means; a switch, normally located under the dashboard which is operated by the brake pedal suspension or a pressure sensitive switch that monitors the hydraulic fluid pressure of the braking system.
The first switch makes contact when the pedal is pushed, the second, when pressure rises in the braking system. .

Either way, the switch has probably failed or is the first type, the pedal is not returning all the way to its stop therefore leaving the mechanical switch in its 'on' mode.

Check for the mechanical switch first under the dash and press the brake pedal just with your hand while you are watching the suspension to see if when you let go of the pedal that it returns to its stop.
Once you let go of it, lift it to see if there is still a distance to the pedal stop.

I have seen this kind of switch get worn or sticky and prevent the pedal suspension from returning completely which will keep the brake lights on.

If you find no mechanical switch under the dash, locating a pressure switch is more difficult since it is likely under the hood and perhaps not easily seen.
You might need a Peugeot mechanic to locate it for you.