Lincoln MKS Brake Light Switch Guide for 2009-2016 Models
Having brake light or gear shift problems with your Lincoln MKS? Your brake light switch might be the cause.
- A faulty brake light switch can cause multiple issues, including no-start conditions, a stuck shifter, and non-working brake lights.
- Replacement is a simple, 30-minute DIY job that requires no special tools, saving you on labor costs.
- If your brake lights don't work, do not drive the vehicle as it is a serious safety risk.
- While budget aftermarket parts are available, choosing an OEM (Motorcraft) or a reputable aftermarket brand like Standard Ignition provides greater reliability.
Is Your MKS Brake Light Switch Failing?
A failing brake light switch on your Lincoln MKS can cause confusing electrical problems. Because the switch is connected to multiple systems, a single bad part can lead to several symptoms at once. These issues usually appear without warning and can be intermittent at first. Recognizing the signs early can save you from a potential safety issue or the inconvenience of a car that won't start or shift out of park.
Common Failure Symptoms
If your brake light switch is going bad, you might notice one or more of these issues:
🎬 Watch: A quick guide to common brake switch failure symptoms.- No Brake Lights: The most serious symptom. Your brake lights do not turn on when you press the pedal.
- Brake Lights Stuck On: The brake lights stay on even when your foot is off the pedal, which can drain your battery. 🎬 See why your brake lights might stay on even when parked.
- Can't Shift Out of Park: The gear shifter is locked in the 'Park' position, even with your foot on the brake.
- Cruise Control Issues: The cruise control won't turn on, or it shuts off by itself while you're driving.
- Car Won't Start: On models with a push-button start, the engine won't turn over because the car doesn't detect that the brake pedal is pressed.
- Warning Lights: The ABS or traction control warning light may appear on your dashboard.
Known Issues and Recalls
There was a recall for some 2009 Lincoln MKS models because the brake light switch may have been installed incorrectly at the factory. This could cause a delay or failure of the brake lights to turn on. The fix was to have a dealer reinstall the switch correctly. While no recall was issued for faulty parts across the entire 2009-2016 range, this history shows the importance of proper installation.
Choosing the Right Aftermarket Switch
When replacing the brake light switch, you have a few options. The choice between OEM and aftermarket often comes down to budget and trust in the brand.
OEM - Motorcraft: Motorcraft is Ford's official parts brand. Choosing a Motorcraft switch is the safest bet for a perfect fit and operation identical to the original part. It is the benchmark for quality and reliability. If you want peace of mind and are willing to pay a bit more, OEM is the way to go.
Premium Aftermarket - Standard Ignition (SMP), Holstein: Brands like Standard Ignition and Holstein are well-regarded in the aftermarket community. They design their parts to meet or exceed OEM specifications and often provide a good balance of quality and price. These are solid alternatives to the OEM part.
Standard Aftermarket - Dorman, True Tech, and others: Dorman is a widely available brand that often provides a cost-effective solution. For a simple part like a brake light switch, these brands are generally acceptable. However, quality can sometimes be inconsistent with budget-friendly electronic parts, so it's important to buy from a retailer with a good warranty and return policy.
Installation is DIY-Friendly
Replacing the brake light switch is a simple job that most owners can do at home in under 30 minutes with no special tools. The switch is located on a bracket just above the brake pedal arm. The process involves disconnecting the electrical connector, twisting the old switch to unclip it from its bracket, and then installing the new one in the reverse order. Doing it yourself can save you significant labor costs.
🎬 Watch this step-by-step walkthrough to replace the switch yourself.Cost to Replace Lincoln MKS Brake Light Switch
| Part Type | Average Cost |
|---|---|
| New Aftermarket Part | $21 - $43 |
| New OEM (Motorcraft) Part | $37 - $59 |
| Shop Labor | $70 - $140 |
| DIY Total (Aftermarket) | $21 - $43 |
| Shop Total (Aftermarket) | $91 - $183 |
Frequently Asked Questions
Can I still drive my MKS with a bad brake light switch?
It is not recommended. If your brake lights are not working, it is a major safety hazard and illegal to drive. If the issue is preventing you from shifting out of park or starting the car, you will be stranded.
Why can't I shift out of park?
The brake light switch sends a signal to the shift interlock solenoid, which releases the gear shifter. If the switch is bad, it doesn't send the signal, and the shifter remains locked in Park as a safety feature.
Is a bad brake light switch the same as a bad brake light bulb?
No. If only one brake light is out, the problem is likely a burnt-out bulb. If all brake lights fail to work at the same time, the brake light switch or a fuse is the more likely cause.
Do I need to get the new switch adjusted?
Most modern switches are self-adjusting or designed to work correctly once clipped into the bracket. The key is to make sure it is fully seated. When installed, the switch's plunger is depressed; when you press the brake pedal, the plunger extends and activates the lights.
Helpful Videos
Technical Specifications
OEM Part Numbers: 8T4Z-13480-A SW-6545 BL3Z-13480-A
4-Pin connector, Plunger-activated switch, Mounts to brake pedal bracket.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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