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- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
Rear Brake Pad Wear Sensor - Sold each
Maintain the safety, reliability and performance of your
Porsche braking system with this OE Match Rear Brake Pad Wear Sensor. Designed specifically for Porsche 997 Carrera 2S and Carrera 4S
models, this sensor forms a vital part of the factory brake wear monitoring
system, helping drivers monitor rear brake pad condition and schedule
maintenance before braking performance is affected.
Fits:
Installed directly into the rear brake pad assembly, the wear sensor monitors the remaining thickness of the brake pad friction material. When the pads approach their minimum service limit, the sensor activates the dashboard brake wear warning light, alerting the driver that replacement is required.
For high-performance sports cars such as the Porsche 997 Carrera S models, maintaining the brake wear monitoring system is essential for preserving braking efficiency, protecting expensive brake components and ensuring maximum driving confidence.
What Does a Brake Pad Wear Sensor Do?
The brake pad wear sensor continuously monitors brake pad thickness throughout its service life.
As the brake friction material wears down, the sensor eventually contacts the brake disc and completes an electrical circuit, triggering the brake wear warning light on the instrument cluster.
A correctly functioning sensor helps:
- Monitor brake pad condition
- Provide early brake wear warnings
- Prevent excessive brake pad wear
- Protect brake discs from damage
- Improve maintenance scheduling
- Support safe braking performance
- Maintain factory brake monitoring functionality
The sensor acts as an important preventative maintenance component, helping avoid costly brake repairs.
Why Do Brake Pad Wear Sensors Fail?
Brake wear sensors are exposed to extreme operating conditions including heat, vibration, moisture and road contamination.
Common causes of failure include:
- Normal brake pad wear
- Sensor activation when brake pads reach their wear limit
- Damaged wiring
- Corrosion in electrical connectors
- Heat-related deterioration
- Water ingress
- Physical damage during brake servicing
- Age-related material fatigue
As brake wear sensors are considered service items, they should be replaced whenever they become activated or damaged.
When Should a Brake Pad Wear Sensor Be Replaced?
Replacement is recommended whenever brake pads are changed or if the sensor has become damaged.
Common symptoms include:
- Brake wear warning light illuminated
- Intermittent brake warning messages
- Damaged or broken sensor wiring
- False brake wear warnings
- Corroded electrical connections
- Sensor damage during brake servicing
- Rear brake pad replacement due to wear
Replacing the sensor during brake pad replacement ensures the monitoring system continues to function correctly.
Why Replacement Matters
A functioning brake wear sensor helps maintain braking safety and protects expensive brake system components.
Benefits include:
- Accurate brake pad monitoring
- Reliable dashboard warning operation
- Improved braking safety
- Protection of brake discs
- Reduced maintenance costs
- Better servicing planning
- Improved brake system reliability
- Long-term braking component protection
For Porsche 997 owners, maintaining the brake wear monitoring system helps preserve both performance and peace of mind.
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Sold as EACH. There are 2 per axle.
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Brake pad wear sensors help to indicate if your brake pads need changing. These should normally be replaced when replacing your brake pads.
Sold individually, typically 2 sensors per axle for complete front pad sets
Fits:
Porsche 95B.1 Macan 2.0L 2014 - 2018 FRONT
Brake pad wear sensors are designed to sense when brake pads reach a critical wear point. When the friction material becomes thin enough, the sensor’s circuit is completed (or broken) and the vehicle’s instrument cluster triggers a brake pad warning light. This alerts the driver that pad replacement is due, helping prevent rotor damage and preserve safe braking performance.
Functions & Technical Role
• Wear detection: Monitors pad thickness and detects end-of-life condition for brake pads.
• Driver alert: Interfaces with the onboard brake electronics to trigger a dashboard pad wear warning.
• Braking safety support: Helps ensure brakes are serviced before performance is compromised.
• OEM quality and fit: Manufactured to original Porsche dimensions, connectors and electrical specifications for seamless integration with brake wiring harnesses.
Brake pad wear sensors play an important safety and maintenance role. Without a functioning sensor, the vehicle cannot warn the driver when pads are worn to a critical level, increasing the risk of brake performance degradation, rotor damage, and potentially unsafe stopping distances. Replacing worn or damaged sensors with Porsche Genuine OE parts ensures the brake wear monitoring system functions exactly as designed
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