My brake light switch is not meeting my brake pedal causing my brake lights to be on all the time. the switch works fine the only way i can get it to work is by pulling my pedal up but as soon as i brake hard it clicks back into place causing my brake lights to stick on.
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Re: brake light switch not meeting brake pedal
Take another look at the switch ? it should be adjustable? disconnect the wires from switch then screw switch inwards towards pedal till plunger is pushed fully into switch? then reconnewct wires and try brake lights work correctly ?
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Look at the top of the brake pedal neck where it meets the switch. Either the switch is bad or there may be a small plastic pad where the switch meets the brake pedal. If that pad is cracked, crushed or missing...replace it(dealer item). Good luck.
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.
Definately a likely cause. The brake lights are controlled by a switch that is located next to the brake pedal. When you push the brake pedal, the switch moves and turns on the lights. If your brake pedal is loose or the switch is not aligned just right, it could cause your brake lights to fail intermittently.
The brake light sending unit under your pedal link sends a signal to the lamps to come on when you depress the pedal. Something is wrong where the pedal meets the unit. Apparently the switch works or the lights would not come on and go off, so either the switch needs to be adjusted to give you more clearance or the the brake pedal return spring is getting weak and not returning the pedal to the full upright position.
It could be the switch on your brake pedal or it could be a short in the brake wiring harness causing the brake light to stay on.I,m not sure but I would also check to see if those cars have a relay in the brake circuit.
The brake light switch is located under the dash - if you'll look at the brake pedal and follow it up until you see a plastic cylinder with an electrical connection - that should be the brake light switch - they are often difficult to remove (they are in a bad place and hard to get to - sometimes they are threaded as well - sometimes use a clip to hold them in) They have a push-button that contacts the pedal arm - When the brakes are off, the switch is "electrically open" and has no internal connection (no brake lights) when you push the brakes Switch is now "electrically closed", the switch button releases and the switch makes a connection internally to activate the lights - yours has either lost it's mounting and no longer contacts the pedal arm, keeping brake lights on - or has an internal short - keeping them on even when the switch is activated .....This often means that your brake lights do not work correctly (or rather stay lit at all times while you are driving) thus, a definite safety hazard - remove the wiring pigtail, remove and replace the switch and plug the wiring back in - have someone check that they are now working correctly - or use a mirror - (sometimes, on some vehicles there is a rubber plug that fits into the brake lever where it contacts the switch - this plug can fall out or break apart and cause the same problem, so when you get up under the dash to look for it, ensure the parts are there, and I usually activate the pedal with my hand and visually check the mechanicals to ensure proper operation and part presence....) The switch can also be mounted directly to the arm and moves with the pedal - or mounted on the car and is depressed by the pedal - I've seen it done several different ways so use your common sense and you'll be just fine...
some nissans have a rubber plug on the metal part of the brake pedal look under the dash where the the pedal arm meets the brake light switch if there is a hole ther the plug has fallen out to make sure find the brake switch and manually push the plunger on the switch in have an assitant see if the brake lights go off if they do you will need to replace the rubber insert there will be a hole in the brake pedal arm where it goes
When you depress the brake pedal, the brake pedal will move away from the brake light switch and cause a close circuit and the brake lamps light up. There is a rubber bunk on the pedal which pushes against the brake light switch to shut it off when you release the brake pedal. Most likely this rubber bunk has either fallen off or disintegrated leaving a hole in the brake pedal so there is nothing to push against the switch to shut it off. Look up the brake pedal until you see the brake light switch, then depress the brake pedal to see if the rubber bunk is still there. It is easy to replace. Or you can use some double sided adhesive tape and a coin and stick the coin over the hole in the brake pedal.