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Pelican Technical Article:

ABS Brake Sensor Replacement

Kerry Jonsson

Time:

1 hour1 hr

Tab:

$150

Talent:

**

Tools:

6mm Allen head socket with ratchet

Applicable Models:

Mercedes-Benz R129 (1990-02)

Parts Required:

ABS speed sensor

Hot Tip:

Clean tone wheel with wire brush while sensor is removed

Performance Gain:

Stop constant ABS activation
A major development in automotive safety is the anti-lock brake systems.  Sensors at the wheel detect wheel speed.  If the speed of one wheel is slower than the others the computer knows that wheel is locking up.  That ABS computer reduces brake pressure to that wheel until it is traveling the same speed as the others.  The ABS computer then continues to reapply the brakes until the car slows down.  If a wheel speed sensor is not functioning properly you may get a warning light for the ABS or you may feel the ABS activate at low speeds for no reason.  In this tech article we will show you how to replace your ABS wheel speed sensor.

In order to replace your ABS with wheel speed sensor you will need to jack up and support the vehicle to remove the wheel.  See our tech article on jacking up and supporting your vehicle.
This picture illustrates the left front wheel at the base of the strut.
Figure 1

This picture illustrates the left front wheel at the base of the strut. Remove the 10 mm fastener (green arrow) that holds on the ABS electrical connector mounting bracket.

Lift the bracket up and pull it straight up to move it out of the way.
Figure 2

Lift the bracket up and pull it straight up to move it out of the way.

Squeeze the electrical connector and pull it straight out of the harness connector.
Figure 3

Squeeze the electrical connector and pull it straight out of the harness connector.

Remove the two 6 mm Allen head fasteners (green arrows).
Figure 4

Remove the two 6 mm Allen head fasteners (green arrows).

Lift the sensor out of the opening in the spindle.
Figure 5

Lift the sensor out of the opening in the spindle. Installation is the reverse of the removal steps. Fit the sensor into its opening in the spindle and bolt down the two fasteners. Plug in the electrical connector, return it to its bracket and bolt down the mounting bracket. Install the wheel and return the vehicle to the ground. Drive the car and verify that the ABS light has not come on.

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Page last updated: Sat 3/25/2017 02:29:14 AM