Brake pad wear sensor. Porsche Boxster 986 / 996 / 996TT / 997  ❭  99661236501

Front & Rear Brake Pad Wear Sensor
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Maintain the safety and performance of your Porsche braking system with this OE Match Brake Pad Wear Sensor. Suitable for front and rear brake applications on selected Porsche 986 Boxster, Porsche 996, Porsche 996 turbo and Porsche 997 models, this sensor forms a vital part of the factory brake wear monitoring system.

• Porsche 996 C2 3.4L 1997-08/01
• Porsche 996 C4 3.4L 1997-08/01
• Porsche 996 C2 3.6L 09/01-2005
• Porsche 996 C4 3.6L 09/01-2005
• Porsche 996 C4S 3.6L 09/01-2005
• Porsche 996 TURBO 2000-05

• Porsche Boxster 986 2.5L 1997-99
• Porsche Boxster 986 2.7L 1999-02
• Porsche Boxster S 986 3.2L 1999-02
• Porsche Boxster 986 2.7L 2003-04
• Porsche Boxster S 986 3.2L 2003-04

• Porsche 997 MK1 Carrera 2 3.6L 2005-08
• Porsche 997 MK1 Carrera 4 3.6L 2005-08

The brake pad wear sensor continuously monitors brake pad thickness and alerts the driver when replacement is required. By providing an early warning before the friction material becomes excessively worn, the sensor helps protect brake discs, maintain braking performance and prevent costly repairs.

For high-performance Porsche sports cars, maintaining the brake wear monitoring system is essential to ensure optimum braking efficiency and vehicle safety.

What Does a Brake Pad Wear Sensor Do?

The brake pad wear sensor is fitted directly into the brake pad and monitors the remaining friction material.

As the brake pad wears down, the sensor eventually contacts the brake disc and completes an electrical circuit that activates the brake wear warning light on the dashboard.

A properly functioning sensor helps:

• Monitor brake pad condition
• Provide early brake wear warnings
• Prevent excessive brake pad wear
• Protect brake discs from damage
• Improve maintenance planning
• Support safe braking performance
• Maintain factory brake monitoring functionality

The sensor serves as an important preventative maintenance tool, helping owners replace brake pads before braking performance is affected.

Why Do Brake Pad Wear Sensors Fail?

Brake wear sensors operate in a demanding environment exposed to heat, vibration, moisture and road contamination.

Common causes of failure include:

• Normal brake pad wear
• Sensor activation after pad wear reaches its limit
• Damaged wiring
• Corrosion in electrical connections
• Heat-related deterioration
• Physical damage during brake servicing
• Water ingress
• Age-related material degradation

Because the sensor is designed to operate alongside the brake pads, it is often recommended to replace the sensor whenever new brake pads are installed.

When Should a Brake Pad Wear Sensor Be Replaced?

Brake wear sensors should be replaced whenever they have been activated, damaged or when brake pads are renewed.

Common signs include:

• Brake wear warning light illuminated
• Intermittent brake warning messages
• Broken or damaged sensor wiring
• False brake wear warnings
• Corroded sensor connectors
• Sensor damage during brake servicing
• Brake pad replacement due to wear

Replacing the sensor during brake maintenance helps ensure the brake monitoring system continues to function correctly.

Why Replacement Matters

A functioning brake wear sensor helps protect your braking system while maintaining safety and reliability.

Benefits include:

• Accurate brake pad monitoring
• Reliable warning light operation
• Improved vehicle safety
• Protection of brake discs
• Reduced maintenance costs
• Better service planning
• Improved braking system reliability
• Long-term braking system protection

For Porsche owners, maintaining the brake wear monitoring system helps preserve the performance, safety and confidence expected from the marque.