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Lincoln Mark Lt Brake Lamp Failure Switch

How to Diagnose Lincoln Mark LT Brake Lamp Failure Switch

Fixing the problem of your Lincoln Mark LT brake lamp failure switch seems simple and straightforward. If the brake lights don't come on when the brakes are applied, replace the switch. The question is, do you know how to diagnose the problem, and are you sure it is really the switch? The guide below will help you find the problem in a particular situation and identify what actions you need to take. Take note that the switch is the one that turns the brake lights on when you depress the brake pedal, hence you'll know you have a bad switch if any of these two happens:

Brake lights stay on

There are a few things that account for brake lights that don't go off. The most common is a bad brake lamp failure switch. Over time, the switch wears out and the contacts fail to disengage. When it does, the switch continues to supply power to the brake lights even when the brakes are not applied. To test if the switch still works, remove the switch and test if the plunger and switch are making contact. If the lights work, the switch is bad and needs to be replaced. Also check if the pedal and the plunger are properly aligned. Sometimes, one of these components may slip out of position, causing the switch to stay in the on position or not to return to full off position. If this is the case, you only need to realign them back in place.

Brake lights don't turn on

Other factors besides the brake light switch could be blamed why your brake lights won't turn on. Check if the light wiring is good, the bulbs are not busted, and the fuse is not burnt. Once you know that all are working properly, check the switch. Make sure that it is making a full contact with the plunger. If it does and the lights are still not working, remove the switch and test if there is a full circuit (like what you do if the brake lights stay on). If the brake lights turn on, the switch must be replaced.

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  • Lincoln Mark Lt Brake Lamp Failure Switch Replacement and Care Tips

    The Lincoln Mark LT brake lamp failure switch rarely fails and has a long service life of at least 100,000 miles. While it has nothing to do with your brakes, it plays an important role of keeping the driver of the vehicles behind you warned that you are either slowing down or making a full stop, thereby preventing potential rear-end collision. The switch is located in front of the brake pedal and connected to the power brake booster push rods through a series of pins, contacts, and spring. The wires connected to the switch send the electrical signal so that that the brake lights will come on when the brakes are applied. The brake lamp failure switch of the Mark LT is a pretty reliable component of the brake light system, but should anything happen to it, your knowledge on how to replace this part comes in handy. Here's how to remove and install brake lamp failure switch on your Lincoln Mark LT, plus other tips to keep it working:


    Replacement tips

    Remove the old brake lamp failure switch.


    Disconnect the negative battery cable. Then crawl underneath the dashboard on the driver side and locate the old brake lamp failure switch. Once you have found the switch, lift the locking tab to remove the wire harness, washer and the retainer. Once the switch is set free, slide it away from the pedal.


    Slide in the new brake lamp failure switch.


    Now that the old switch is removed, you can easily slide the new one. Connect the wire harness washer, and retainer and test your work. This is an easy procedure that requires minimum skill. As you can see, you just have to know two things: the location of the switch and the correct replacement.


    Care and safety tips

    Check if the switch works by testing if the brake lights turn on.


    If the switch falls out of place, repair or replace it right away.


    If the switch no longer works or if it works intermittently, replace it at the soonest possible time.