Disc Brake Pad Wear Sensor. Sensor Wire. BPI DRUMS, BRAKEBEST SELECT IMPORT DIRECT, BRAKEMASTER, CENTRIC PARTS, HELLA-PAGID, MAGMA BRAKES, PORSCHE OE, VOLKSWAGEN OE, WAGNER BRAKE. Warranty Duration. WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.