The Mercury Mountaineer features a anti-lock brake system for the rear wheels only. This system uses a sensor to measure the rotational speed of each wheel. The system adjusts the amount of braking power each wheel receives when the brake pedal is depressed. This prevents the wheels from locking and helps to provide stable deceleration. The anti-lock brake sensor on your Mountaineer can fail, requiring replacement. Replacing a rear anti-lock brake sensor is a repair job that most do-it-yourself mechanics can complete in under an hour.
Disconnect the negative battery cable with an adjustable wrench.
Clean the axle housing around the sensor with a rag or shop towel. Disconnect the electrical harness from the sensor, located on the axle housing.
Remove the bolt from the sensor with a socket wrench and remove the sensor from the axle.
Lubricate the new sensor with a small amount of engine oil. Install the new sensor using the mounting bolt and tighten it with a socket wrench.
Connect the electrical connector to the sensor.
Connect the negative battery cable with an adjustable wrench.
