Brake pad wear sensor, Rear. Porsche 991 S 3.8L / 991 3.4L / 991 GT3 / 992.1 Carrera / 992.2  ❭  9P1907637A

Brake pad wear sensor. Rear.
This OE Match rear brake pad wear sensor is a replacement sensor wire used on selected Porsche 991 and 992 models. It is fitted to the rear brake caliper area and monitors brake pad wear, helping alert the driver when the rear brake pads are due for replacement. These should normally be replaced when replacing your brake pads.
This has a Double pad sensor same as OE Sensor 9P1907637A


Porsche 991 C2 / C4 3.4L 2012>> (REAR CALIPER)
Porsche 991 C2S / C4S 3.8L 2012>> (REAR CALIPER)

Porsche 992.1 C2 / C2S / C4 / C4S 2019>> (REAR CALIPER)
Porsche 991 GT3 (REAR CALIPER)  without option 450, without IY2
Porsche 992.1 Carrera 2019>> (REAR)
 * For cars with 17-inch brake disc, brake caliper BLACK (PR:A8C+2EB)
 * For cars with 17-inch brake disc, brake caliper RED / BLACK (PR:A8F+2EB, 2ET)

Price shown is for each wire sensor.

Fits Left or Right


Functions

• Monitors rear brake pad wear
• Triggers the brake pad warning system when pads are worn
• Helps prevent excessive brake pad wear
• Protects brake discs from damage caused by worn-out pads
• Supports safe and timely brake maintenance
• Fits rear brake caliper applications
• OE Match replacement for the original rear wear sensor wire

Why Replace This Part?
Brake pad wear sensors are normally replaced when new brake pads are fitted, as the old sensor may be worn, brittle, damaged, or triggered. A faulty or damaged sensor can cause false brake warnings or fail to alert the driver when the pads are worn. Replacing the sensor during rear brake service helps restore correct warning system operation and supports braking safety.

When to Replace This Part

• Rear brake pads are being replaced
• The brake pad wear warning light is displayed
• The sensor wire is worn, cut, brittle, or damaged
• The sensor has contacted the brake disc
• Brake warning faults remain after pad replacement
• Rear brake calipers or pads have been removed for service
• As part of routine rear brake maintenance

Where it fits on the car
This sensor fits on the rear brake caliper / rear brake pad assembly. It is used in the rear braking system to monitor pad wear and connect the brake pad wear circuit to the vehicle’s warning system.

Related reference numbers
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9P1907637A

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