Holstein 2BWS0123 Disc Brake Pad Wear Sensor - Front

Front Brake Pad Wear Sensor for BMW

Holstein Parts 2BWS0123 is a front disc brake pad wear sensor for select BMW applications. It monitors brake pad condition and helps trigger the wear warning system when pad material reaches the service threshold. This Holstein Parts sensor is built for direct replacement use on BMW 325xi, 330i, 330Ci, 330xi, M3, and Z4 front brake setups.

Key Features

• Disc brake pad wear sensor for front brake applications
• Pin terminal type with 2 terminals
• 1 round female connector
• Direct-fit replacement for select BMW models
• Cross-references common OE and aftermarket part numbers

Product Details

Holstein Parts 2BWS0123 is a front brake pad wear sensor designed for vehicles equipped with an electronic pad wear warning system. The sensor uses a round female connector, pin-style terminals, and a 2-terminal layout to match the original connection style on supported BMW front brake systems. If you are searching for a BMW 330i front brake pad wear sensor, BMW M3 front wear sensor, or a BMW Z4 front brake pad wear sensor with cross drilled front rotor, this part matches the listed applications.

Holstein Parts is the product line name used for this brake sensor application, and 2BWS0123 is the identifying part number for ordering and cross-reference lookup. This part cross-references Beck/Arnley 084-1522 and Standard Ignition PWS116 for the same application.

Vehicle Fitment

• Fits 2001-2005 BMW 325xi, Front
• Fits 2001-2005 BMW 330i, Front
• Fits 2001-2005 BMW 330xi, Front
• Fits 2001-2006 BMW 330Ci, Front
• Fits 2001-2006 BMW M3, Front
• Fits 2006 BMW Z4, Front, with Cross Drilled Front Rotor

Common Issues This Part May Address

• Brake wear warning light stays on after pad service
• Brake pad wear indicator circuit shows an open or damaged sensor
• Front brake warning message appears on the dashboard
• Worn, broken, or heat-damaged pad wear sensor at the front axle
• Incorrect sensor fitment after front brake pad replacement

Installation Notes

Verify the connector shape, terminal count, and front axle application before installation. Inspect the brake pad wear circuit, routing, and connector condition during brake service, especially on BMW 325xi, 330i, 330Ci, 330xi, M3, and Z4 front brake systems. Confirm the rotor and pad configuration on the 2006 BMW Z4, since this application is listed with a cross drilled front rotor note.

Quality Assurance

Holstein Parts 2BWS0123 is cataloged for the specified BMW front brake applications and cross-references established OE and aftermarket numbers for the same use case. The part number 2BWS0123 should be matched to the vehicle year, model, and front position before installation.