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Brake light switch usually pushes into bracket until the switch plunger hits the back of the brake pedal and is fully depressed, then turn the switch to lock it in place. Next, connect the wiring plug. The point is, it must be depressed when the brake pedal is up, as it turns on the lights as you push the pedal down and its plunger is released.
While I'm not overly familiar with Mercedes, I'd assume that it still has a brake light switch located on the bar of the brake pedal itself. This switch is typically just a "plunger" style switch, where when you push the pedal down as if applying the brakes, the plunger extends outward turning the brake lights on. When the pedal is released, as if letting off the brakes, the plunger is depressed causing the lights to shut off. If that plunger gets stuck in a depressed position, the lights will remain off at all times. Check that first, along with the brake light fuse and/or relay. Good luck.
Check fuse.Diagram on fuse box.If it's ok then check brake light switch.Look up at brake pedal lever and you'll see it.Press brake pedal and check if brake switch plunger is moving.Similar to a fridge light switch
disconnect the wires from the brake pedal switch, put an ohm meter across the connectors and move the plunger in and out. if there is a short one way and an open the other way, the switch is good. if there is no change in resistance, based on the plunger position, then the switch is bad.
You need to crawl under the dash and look up at the top of the brake pedal arm. you will see a switch with a plunger and 2 wires that is attached to the brake frame so the plunger moves when the brake pedal is pressed. That is the brake switch.
Assuming there is nothing wrong with the Brakes, and that the Brake Pedal does not have the "play" you describe: There is a Push Brake Light Switch located up behind the Brake Pedal Arm. It is a Push actuated with a Plunger being pushed in activating the Brake Lights. Follow the Brake Pedal Arm up into behind the Dash. The Switch is adjustable and removable. There are two nuts on this Switch, holding and securing the Switch to a bracket. The Switch itself screws in/out of the bracket after the nuts have been loosened. Unplug the Switch. The nuts need to be loosened. The Switch in your case will need to be unscrewed out of the bracket moving the Plunger away from the Brake Pedal Arm. In some cases this Plunger is already all the way OUT (with it plugged back in) and the Brake Lights will stay on. In this case the Switch has to be replaced. It will also need to be replaced if the plunger is stuck in the "in" position. The Plunger is retrned to the "out" position by a spring, which maybe malfunctioning. WITH a helper looking at the Brake Lights and the Switch plugged back in: Adjust (screw out) the Switch in the Bracket so that the Brake lights to go out. Again if the adjustment does not solve it, remove and replace this Switch. Once that adjustment is complete, turn the locking nuts on the Switch - securing it in place. This Switch is available at Autozone Part #80172 for about $15.
Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!
The brake light switch is at fault. Get a new one and replace it. The location is at the brake pedal area mounted on a bracket with a plunger stud that rest on the brake pedal's arm the pad is attached to
Go to the Brake Light Switch located on the rear side of the Brake Pedal Arm.
Test this Switch by pushing the plunger in and check to see if you have Brake Lights. If you do have brake lights then the switch is good. Most of these plungers can be adjusted out or in to make a good connection. with the Brake Pedal Arm to activate the brakes.
If you do not have brake lights when you depress the plunger:
Remove the switch from the support arm.
Disconnect the electrical connection.
Check for Voltage.
If you have Voltage: replace the Switch.
If you do not have Voltage then recheck the Fuses and Relays.
Let me know if this worked or if you have additional information or questions. Feel free to contact me at FixYa.com!
hi assume all brake lights including high level light ? are not working ? 1st check is the fuse ? if it is ok? then next check is the brake stop light switch located at the pedal just near the top of pedal the switch is normaly adjustable and screws into the pedal boxframe that pedals fit /pivot to the switch operates on plunger method ie when pedal pressed the small plunger moves out and puts lights on then when pedal released plunger is pushed back lights off the switch is plastic and has a plug with 2 wires attached to test if plug is defective ? unplug wires from switch then using either a paper clip or piece of wire ? connect /join both wires in plug then sitch ign on if lights work ? switch is defective simple diy to replace cost here in uk for switch approx £4 hope this helps ?