A bolt for use with a hydraulic disc brake caliper. The bolt includes a head and a shaft extending outwardly from the head. The shaft includes a threaded portion having a diameter, at least one channel defined at least partially in the outer surface of the threaded portion, and a reduced diameter portion defined at least partially circumferentially around the shaft and located between the head and the threaded portion. When the bolt is threaded into an opening, the at least one channel and the reduced diameter portion are in fluid communication.