1990-1998 Ford Taurus Parking Brake Switch Diagnosis and Replacement
Is the 'BRAKE' light on your dashboard acting up? This guide explains the common cause and how to fix it.
- The most common symptom of failure is the 'BRAKE' light on the dash staying on or not working correctly.
- This part is different from the brake light switch, which controls the rear lights and shift interlock.
- Replacement is a simple DIY task, requiring only a 5.5mm socket and about 30 minutes.
- A faulty switch can mask a true emergency with your hydraulic brake system, so it should be replaced.
Is This the Right Switch? Parking Brake vs. Brake Light Switch
It's easy to confuse the parking brake switch with the brake light switch. The parking brake switch only controls the 'BRAKE' warning light on your dash. The brake light switch, a separate part, controls your rear brake lights and the shift interlock (allowing you to shift out of Park). If your rear brake lights are stuck on or you can't shift out of Park, you likely need a brake light switch, not a parking brake switch.
Symptoms of a Failing Parking Brake Switch
On the 1990-1998 Taurus, the signs of a bad parking brake switch are all tied to the dashboard warning light. You will likely experience one of the following:
- 'BRAKE' Light Stays On: The most common symptom. The switch is stuck in the 'on' position, keeping the light illuminated even when the parking brake is fully released.
- 'BRAKE' Light Won't Turn On: When you press the parking brake pedal, the light on the dash does not come on at all. This indicates the switch has failed in the 'off' position.
- Flickering 'BRAKE' Light: The light may flicker or turn on and off as you drive, especially over bumps. This points to a loose connection or an internal short in the switch.
Important Warning
The 'BRAKE' dashboard light can also indicate a serious problem with your main braking system, such as low brake fluid or a loss of hydraulic pressure. If the light is on, always check your brake fluid level and ensure the brake pedal feels firm. A faulty parking brake switch can mask a real safety issue, so it's important to diagnose it correctly.
Choosing the Right Aftermarket Switch
For a vehicle of this age, new OEM parts can be hard to find. Aftermarket brands offer a reliable and affordable solution. The two main brands available are Standard Ignition and Rostra Powertrain.
- Standard Ignition (Standard Motor Products): Often labeled as SMP, this is a very common and well-respected aftermarket brand. They have been making quality electrical components for decades and are considered by many mechanics to be a go-to choice for parts like these. For a simple switch, their product is a dependable, near-OEM quality option.
- Rostra Powertrain: Rostra is another established manufacturer, known for making electronic parts like sensors and solenoids in the USA. They have a reputation for quality control and producing reliable components. While perhaps less known for this specific switch than Standard, Rostra is a solid choice.
Pro-Tip: For a non-critical electronic part like a parking brake switch on an older vehicle, both Standard and Rostra are excellent choices. The decision can often come down to price and availability. Avoid unbranded, deeply discounted parts, as their quality can be inconsistent.
Cost of Replacing a Parking Brake Switch (1990-1998 Ford Taurus)
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Rostra, Standard) | $33 - $87 |
| New OEM | $50 - $100+ (If available) |
| Shop Labor | $45 - $90 |
Frequently Asked Questions
Where is the parking brake switch located?
The parking brake switch is mounted directly to the parking brake pedal assembly, located under the driver's side dashboard. You will need to look up above the pedal to see it. It's a small switch with an electrical connector, held in place by a single bolt.
Can I replace the parking brake switch myself?
Yes, this is a very easy DIY repair. The job requires basic tools, primarily a ratchet with a 5.5mm socket. You simply disconnect the electrical plug, remove the one bolt holding the old switch, install the new switch, and reconnect the plug. The entire process should take less than 30 minutes.
What happens if I don't replace it?
While a bad parking brake switch won't prevent you from driving, it creates two problems. First, it's a nuisance and will cause a failed state inspection in some areas. Second, and more importantly, it makes your 'BRAKE' warning light unreliable. You won't know if the light is on because of the faulty switch or because of a legitimate, serious issue with your brake fluid or pressure.
I replaced the switch, but the light is still on. What now?
If a new switch doesn't solve the problem, check three things. First, confirm your main brake fluid reservoir is full. Second, inspect the wiring and connector for the switch to ensure they aren't damaged or corroded. Third, the problem could be with the brake fluid level sensor itself or another part of the brake warning system, which may require further diagnosis.
Technical Specifications
OEM Part Numbers: 2L2Z-15A851-AA
Simple plunger-style, two-terminal switch mounted to the parking brake pedal assembly.
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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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