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Standard Ignition PWS139 Disc Brake Pad Wear Sensor - Rear
| Brand | Standard Ignition PWS139 |
|---|---|
| Position | Rear |
| Connector Gender | Female |
| Connector Shape | Round |
| Contents | Sensor |
| Functions | Brake Pad Wear Sensor |
| Mounting Location | Brake Caliper |
| Terminal Gender | Male |
| Terminal Type | Pin |
| Fits | BMW · 40 vehicles |
Brake pad wear sensor. Monitors pad wear to help signal when service is needed.
Female round connector. Uses a 1-connector, 2-pin pin terminal design for a secure connection.
Caliper-mounted sensor. Built with a 24.25-inch harness for straightforward routing.
Cross-references Beck/Arnley 084-1534, Centric Parts 116.34029 and Dorman - First Stop BW1022 for the same application. See all 17.
Rear Brake Pad Wear Sensor for BMW
Standard Ignition PWS139 is a rear disc brake pad wear sensor for select BMW applications. It monitors brake pad condition at the brake caliper and uses a female round connector with a 24.25-inch harness for direct replacement service.
Key Features
- Brake pad wear sensor for rear brake systems
- Mounts at the brake caliper
- Female round connector with 2-pin male terminals
- 24.25-inch harness length for routing to the factory connection point
- Direct-fit replacement for BMW 525i, 530i, 545i, 645Ci, 528i, 535i, 550i, 650i, M5, and M6 rear applications
- Standard Ignition PWS139 cross-references Beck/Arnley 084-1534 and Dorman - First Stop BW1022 for the same application
Detailed Description
Standard Ignition PWS139 is a disc brake pad wear sensor built for rear brake caliper mounting on select BMW models from 2004 through 2009. It is used in systems that monitor pad wear and trigger a warning when the sensor circuit is interrupted by pad wear. This part number is listed for rear fitment on BMW 525i, 530i, 545i, 645Ci, 528i, 535i, 550i, 650i, M5, and M6 applications, making it a practical replacement for vehicles that need an OE-style brake wear sensor connection.
What It Is Used For
- Brake pad wear warning light stays on after pad service
- Broken, damaged, or worn rear brake wear sensor
- Intermittent brake pad wear indicator signal
- Restoring proper brake wear monitoring after pad replacement
- Replacing a sensor with a damaged connector or harness
Installation Notes and Tips
Install at the rear brake caliper and route the harness to match the original path so it does not contact the rotor, wheel, or suspension components. Verify connector shape, terminal style, and harness length against the original sensor before installation. For BMW 528i rear, BMW 535i rear, and BMW M5 rear applications, confirm the sensor location and connector style match the vehicle’s factory setup.
Quality Assurance
Standard Ignition brake sensors are built for replacement service in vehicle-specific brake wear monitoring systems. PWS139 is cataloged with defined connector, terminal, and mounting specifications to support accurate fitment on the listed BMW rear applications.
| Year | Make | Model | Body Type | Position | Notes |
|---|---|---|---|---|---|
| 2009 | BMW | 528i | — | Rear | — |
| 2009 | BMW | 528i xDrive | — | Rear | — |
| 2009 | BMW | 535i | — | Rear | — |
| 2009 | BMW | 535i xDrive | — | Rear | — |
| 2009 | BMW | 550i | — | Rear | — |
| 2009 | BMW | 650i | — | Rear | — |
| 2009 | BMW | M5 | — | Rear | — |
| 2009 | BMW | M6 | — | Rear | — |
| 2008 | BMW | 528i | — | Rear | — |
| 2008 | BMW | 528xi | — | Rear | — |
| 2008 | BMW | 535i | — | Rear | — |
| 2008 | BMW | 535xi | Sedan | Rear | — |
| 2008 | BMW | 550i | — | Rear | — |
| 2008 | BMW | 650i | — | Rear | — |
| 2008 | BMW | M5 | — | Rear | — |
| 2008 | BMW | M6 | — | Rear | — |
| 2007 | BMW | 525i | — | Rear | — |
| 2007 | BMW | 525xi | — | Rear | — |
| 2007 | BMW | 530i | — | Rear | — |
| 2007 | BMW | 530xi | Sedan | Rear | — |
| 2007 | BMW | 550i | — | Rear | — |
| 2007 | BMW | 650i | — | Rear | — |
| 2007 | BMW | M5 | — | Rear | — |
| 2007 | BMW | M6 | — | Rear | — |
| 2006 | BMW | 525i | — | Rear | — |
| 2006 | BMW | 525xi | — | Rear | — |
| 2006 | BMW | 530i | — | Rear | — |
| 2006 | BMW | 530xi | Sedan | Rear | — |
| 2006 | BMW | 550i | — | Rear | — |
| 2006 | BMW | 650i | — | Rear | — |
| 2006 | BMW | M5 | — | Rear | — |
| 2006 | BMW | M6 | — | Rear | — |
| 2005 | BMW | 525i | — | Rear | — |
| 2005 | BMW | 530i | — | Rear | — |
| 2005 | BMW | 545i | — | Rear | — |
| 2005 | BMW | 645Ci | — | Rear | — |
| 2004 | BMW | 525i | — | Rear | — |
| 2004 | BMW | 530i | — | Rear | — |
| 2004 | BMW | 545i | — | Rear | — |
| 2004 | BMW | 645Ci | — | Rear | — |
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