Rear Brake Pad Wear Sensor
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Maintain the safety and reliability of your Porsche braking
system with this OE Match Rear Brake Pad Wear Sensor. Designed for
Porsche 986 Boxster, Porsche 987.1 Boxster and Porsche 987.1 Cayman models,
this sensor forms an integral part of the factory brake wear monitoring system,
providing an early warning when rear brake pads have reached their service
limit.

Fits:
- 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 Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Installed directly into the rear brake pad assembly, the
sensor continuously monitors brake pad thickness. As the friction material
wears down, the sensor activates the dashboard brake warning system, alerting
the driver that replacement is required. This helps prevent excessive brake
wear, protects brake discs and ensures the braking system continues to perform
safely and efficiently.
For Porsche sports cars, maintaining the brake wear
monitoring system is an important part of preventative maintenance and
long-term braking performance.
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, the sensor eventually contacts the
brake disc and completes an electrical circuit, triggering the brake wear
warning light on the dashboard.
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
service planning
- Support
safe braking performance
- Maintain
factory brake monitoring functionality
The sensor acts as an important safeguard, ensuring brake
maintenance can be carried out before braking performance is affected.
Why Do Brake Pad Wear Sensors Fail?
Brake wear sensors operate in a challenging environment
exposed to heat, vibration, moisture and brake dust.
Common causes of failure include:
- Normal
brake pad wear
- Sensor
activation after reaching its wear limit
- Damaged
wiring
- Corrosion
within electrical connections
- Heat-related
deterioration
- Physical
damage during brake servicing
- Water
ingress
- Age-related
component fatigue
Because the sensor is designed to function alongside the
brake pad, replacement is generally recommended whenever new brake pads are
installed.
When Should a Brake Pad Wear Sensor Be Replaced?
The sensor should be replaced whenever it has been
activated, damaged or when brake pads are renewed.
Common symptoms include:
- Brake
wear warning light illuminated
- Intermittent
brake warning messages
- Damaged
sensor wiring
- False
brake wear alerts
- Corroded
electrical connections
- Sensor
damage during servicing
- Rear
brake pad replacement due to wear
Replacing the sensor during brake maintenance ensures the
warning system continues to operate correctly.
Why Replacement Matters
A functioning brake wear sensor helps maintain braking
safety while reducing the risk of costly brake repairs.
Benefits include:
- Accurate
brake pad monitoring
- Reliable
warning light operation
- Improved
braking safety
- Protection
of brake discs
- Better
maintenance scheduling
- Reduced
repair costs
- Improved
braking system reliability
- Long-term
component protection
For Porsche Boxster and Cayman owners, maintaining the brake
wear monitoring system helps preserve the safety and performance expected from
the Porsche brand.
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