Due to the low density and exceptional wear resistance, SiCp/Al composites have great potential for brake materials used in trains. In this study, a newly developed SiCp/Al brake disc was fabricated by powder metallurgy method. The friction and wear behaviour of SiCp/Al brake were investigated under extensive velocity ranges (40 ∼ 220 km/h) according to the scale-conversion rules. It is found that the matching tribo-couple exhibits low wear loss, reliable friction factor, and high heat resistance. The friction film maintains its continuity and stability at high braking speeds and temperatures, effectively protecting the surface of SiCp/Al composite materials from damage, minimizing wear, and stabilizing the friction coefficient. The excellent reliability of the lightweight SiCp/Al brake disc performance confirms its high technical feasibility to replace heavy iron and steel brake discs in urban rail vehicles that normally travel at 220 km/h.