Ford Bronco II Rear ABS Sensor Guide: 1987-1990
Everything you need to know about the single ABS wheel speed sensor on your 1987-1990 Ford Bronco II.
- The 1987-1990 Bronco II has only one ABS sensor, located on top of the rear differential.
- Before replacing the sensor, try removing it and cleaning the metal debris from its magnetic tip, as this is a common cause for the ABS light.
- A bad sensor will disable your anti-lock brakes, but your normal braking should still work. However, a related valve failure can cause a complete loss of rear brakes.
- Aftermarket brands like Standard Ignition, Delphi, and Dorman are the most practical and available options for this repair.
Is Your 'Rear Antilock' Light On?
The most common sign of a problem with your rear ABS sensor is an illuminated yellow "Rear ABS" or "Rear Antilock" warning light on your dashboard. This light may stay on constantly or turn on and off as you drive. While a faulty sensor will disable your anti-lock braking feature, your standard brakes will still function. However, a related failure in the ABS hydraulic valve can, in some cases, prevent brake fluid from reaching the rear wheels, leading to a loss of rear braking power.
Pro Tip: Clean Before You Replace
The ABS sensor has a magnetic tip. Over time, tiny metal shavings from normal wear and tear inside the differential can stick to this magnet. This buildup can interfere with the sensor's ability to get a clean reading from the tone ring, triggering the ABS light. Before buying a new sensor, it's often worth removing the old one and thoroughly cleaning the magnetic tip. This simple step can sometimes solve the problem without needing a new part.
Choosing the Right Aftermarket ABS Sensor
For a vehicle of this age, original Ford (Motorcraft) parts are likely discontinued or very hard to find. The aftermarket is your most reliable and affordable source. Here’s a look at the available brands based on general industry reputation, as specific reviews for this Bronco II part are scarce.
- Standard Ignition (SMP): Often considered a top-tier aftermarket brand. Standard sometimes re-engineers parts to be more durable than the original. They are a solid choice for reliability.
- Delphi: Delphi is a well-respected brand that is an original equipment manufacturer for many car companies. They are generally known for quality electronics and sensors, making them a dependable option.
- Dorman: Dorman provides a wide range of aftermarket parts and is often the most budget-friendly option. While some users have mixed experiences with Dorman electronics, they offer a functional replacement that meets basic requirements.
Typical Replacement Costs
Replacing the rear ABS sensor is a relatively inexpensive repair. The part itself is affordable, and the labor involved is minimal.
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Sensor | $24 - $39 |
| Shop Labor | $50 - $100 |
| Total Estimated Cost | $74 - $139 |
Frequently Asked Questions (FAQ)
Where is the ABS sensor located on a 1987-1990 Bronco II?
There is only one ABS sensor. It is located directly on top of the rear differential housing, in the center of the rear axle. A single electrical wire runs to it.
Can I replace the Bronco II ABS sensor myself?
Yes, this is a very DIY-friendly job. It typically requires only basic hand tools, like a 10mm socket and a screwdriver. The process involves disconnecting the electrical plug, removing one bolt, and carefully prying the old sensor out of the differential housing. 🎬 See this walkthrough for replacing the rear ABS sensor. The entire job can usually be done in under an hour.
What are the diagnostic codes for a bad ABS sensor?
The 1987-1990 Bronco II uses an older OBD-I system, so you cannot use a standard OBD-II scanner. To get codes, you must locate a diagnostic pigtail near the ABS control module (behind the driver's side door post) and ground it for a moment. The ABS light on the dash will then flash a code. 🎬 Watch: How to test and read your RABS diagnostic codes. For example, a long flash followed by two quick flashes is code 3. Note that if the red "BRAKE" light is also on, the system may not flash a code.
Will a new ABS sensor fix my spongy or weak brakes?
No. A faulty sensor's only direct symptom is the ABS warning light and the deactivation of the anti-lock function. If you have spongy brakes or a loss of braking power, you should inspect the rest of your brake system, including the master cylinder, brake lines, and the RWAL hydraulic valve, which is known to sometimes fail and block fluid to the rear brakes.
🎬 Learn more about the RABS module and how it works.Are there any recalls for the Bronco II ABS sensor?
No. While there were several recalls and many Technical Service Bulletins (TSBs) issued for the Ford Bronco II, searches of the NHTSA database did not show any specific recalls or TSBs related to the ABS wheel speed sensor for the 1987-1990 model years.
Helpful Videos
Technical Specifications
OEM Part Numbers: E7TZ-2C190-A Motorcraft DY1123
Single sensor system for Rear-Wheel Anti-lock (RWAL). Mounts on rear differential housing with a single bolt.
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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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