Disclosed is a friction set for a railway disk brake system for railway rolling stock including: a shoe holder including a receiving slideway; a friction shoe including a brake pad and a profiled shape configured for being slid into the receiving slideway, where the friction shoe includes a pneumatic conduit connecting a first space delimited by a first surface of the friction shoe to a second space delimited by a second opposite surface the friction shoe; at least one through hole arranged in the shoe holder and laid out so as to be facing the pneumatic conduit; and a pneumatic junction ring laid out in the pneumatic conduit forming a pneumatic guide between the through hole of the shoe holder and the pneumatic conduit of the friction shoe.