Brembo A00221 Disc Brake Pad Wear Sensor - Rear

Brembo Rear Brake Pad Wear Sensor

Brembo A00221 is a premium OE equivalent disc brake pad wear sensor that monitors brake pad thickness and alerts the driver when the pads reach minimal remaining life. It is built to OE specifications for direct replacement on supported BMW rear brake applications, including BMW 325Ci, 330Ci, 325i, 325xi, 330i, 330xi, 323Ci, 323i, 328Ci, and 328i.

The Brembo Premium OE Equivalent Wear Sensor line focuses on accurate wear monitoring and OE-style fitment. For BMW rear brake service, Brembo A00221 is a direct replacement choice for maintaining the factory warning function after pad replacement.

Key Features

• Electronic brake pad wear sensor for rear brake applications
• Monitors pad thickness and triggers a warning at minimal pad life
• Built to OE specifications for factory-style operation
• Fits BMW rear brake wear sensor applications across multiple 2000-2006 models
• Brembo A00221 replacement part number for service matching

Detailed Description

This disc brake pad wear sensor is designed for BMW rear brake systems that use an electronic pad wear indicator. When the brake pads wear down, the sensor sends a signal to the vehicle warning system so the driver knows replacement is due. Brembo A00221 is made to OE specifications, helping restore the original warning function on vehicles such as the BMW 325Ci rear, BMW 330i rear, and BMW 328i rear. This part cross-references Hella Pagid 355250371 for the same application.

What It Helps Address

• Brake pad wear warning light staying on after pad service
• Loss of brake pad thickness monitoring at the rear axle
• Need for OE-style replacement during brake pad maintenance
• Incorrect or worn sensor causing false wear alerts
• Restoring the factory brake warning system on supported BMW models

Installation Notes and Tips

Replace the wear sensor during brake pad service when the original sensor is worn or triggered. Confirm rear axle fitment before ordering, since this part is specific to rear brake applications. For BMW 325Ci, 330Ci, 325i, 325xi, 330i, 330xi, 323Ci, 323i, 328Ci, and 328i applications, verify the existing sensor connector and routing match the vehicle’s original setup. Brembo strongly recommends replacing the wear sensor with every brake pad replacement.

Quality Assurance

Brembo manufactures this sensor to OE-equivalent specifications for consistent fit and function in supported BMW rear brake applications. Part number A00221 is engineered to perform like the original wear sensor used on the vehicle.