PowerStop SW-1661 Disc Brake Pad Wear Sensor - Front

Front Brake Wear Sensor for BMW

PowerStop SW-1661 is a front electronic brake pad wear sensor for select BMW X3 and BMW X4 applications. It is built to match OEM form, fit, and function, with a focus on reliable brake wear monitoring and straightforward replacement during brake service.

PowerStop Euro-Stop Sensor Line

The PowerStop Euro-Stop line is made for drivers replacing brake pads and worn sensors at the same time. This front Euro-Stop Electronic Brake Wear Sensor is engineered to meet or exceed OEM requirements and is built for high-temperature operation to help maintain electrode conductivity over long service intervals.

Key Features

• Front disc brake pad wear sensor for BMW applications
• PowerStop part number SW-1661
• OEM-style form, fit, and function
• Blue connector with oval shape
• Male connector and male terminals
• 2-wire harness with 29.92 in. / 760 mm length
• Includes grommets
• Built for elevated temperature resistance

Detailed Description

PowerStop SW-1661 is a front Euro-Stop electronic brake wear sensor designed for BMW X3 and BMW X4 models that use a front pad wear monitoring system. It provides the correct electrical and physical interface for the brake warning circuit, helping restore proper wear-sensor operation after pad service. This sensor is a direct-fit replacement for the front position on 2018-2022 BMW X3, 2019-2022 BMW X4, 2023-2024 BMW X3, and 2023-2025 BMW X4. This part number, SW-1661, is also referenced for the same application under Holstein 2BWS0444.

What It Helps Address

• Brake wear warning light triggered by a damaged front sensor
• Broken or brittle sensor wiring during pad replacement
• Incorrect wear-sensor readings after brake service
• Loss of brake pad monitoring on BMW X3 and BMW X4 front brakes
• Fitment issues caused by using the wrong connector style or harness length

Installation Notes and Tips

Replace the front wear sensor when servicing the brake pads on the listed BMW X3 and BMW X4 applications. Confirm connector shape, terminal style, and harness routing before installation. The sensor uses a blue oval connector with a male terminal layout and includes grommets for routing through the brake assembly. Verify the vehicle’s front brake wear sensor location and match the application by year, model, and position before final assembly.

Quality Assurance

PowerStop states that its Euro-Stop sensors are built to meet or exceed OEM requirements and are tested for durability in extreme temperatures. The SW-1661 is designed to provide long-term brake wear monitoring performance for BMW front brake applications.