rain sensor Genuine Porsche part 98761269300

Rear Brake Pad Wear Sensor 
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Maintain the safety, reliability and performance of your Porsche braking system with this OE Match Rear Brake Pad Wear Sensor. Designed specifically for Porsche 987.1 and 987.2 Boxster and Cayman models, this sensor forms an essential part of the factory brake wear monitoring system, providing an early warning when rear brake pads approach their minimum service thickness.


Fits:

• Porsche Boxster 987 2.7L 2005-08/08
• Porsche Boxster 987 MKII 2.9L 2009-12
• Porsche Cayman 2.7L 987C 2006-08
• Porsche Cayman 2.9L 987C MKII 2009-12

Mounted within the rear brake pad assembly, the sensor continuously monitors brake pad wear and alerts the driver via the dashboard warning system when replacement is required. This helps prevent excessive brake pad wear, protects expensive brake discs and ensures the braking system continues to perform as Porsche intended.

Whether used on a daily-driven Boxster, a Cayman road car or a track-focused build, maintaining the brake wear monitoring system helps ensure optimum braking performance and safety.

What Does a Brake Pad Wear Sensor Do?

The brake pad wear sensor is designed to monitor the remaining thickness of the brake pad 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 provides valuable advance warning before braking performance is compromised.

Why Do Brake Pad Wear Sensors Fail?

Brake wear sensors operate in a demanding environment exposed to constant heat cycles, moisture, brake dust and vibration.

Common causes of failure include:

• Normal brake pad wear
• Sensor activation once wear limits are reached
• Damaged wiring
• Corrosion within electrical connectors
• Heat-related deterioration
• Physical damage during brake servicing
• Water ingress Age-related degradation

As the sensor is considered a service component, replacement is generally recommended whenever new brake pads are fitted.

When Should a Brake Pad Wear Sensor Be Replaced?

The sensor should be replaced whenever it has been activated, damaged or when new brake pads are installed.

Common symptoms include:

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

Replacing the sensor during routine brake maintenance helps ensure continued reliability of the brake monitoring system.

Why Replacement Matters

A functioning brake wear sensor helps maintain braking safety while protecting other brake system components.

Benefits include:

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

For Porsche Boxster and Cayman owners, maintaining the brake wear monitoring system helps preserve both performance and peace of mind.