The C564R (also listed as Sirco C564R, E-1564, 04‑811621, Automann 121.371604.02, etc.) is a right-hand S-camshaft for 16½″ Fruehauf/Pro‑par trailer brake systems. With a rugged 1 5/8″ diameter, 37-spline journal, a forged and induction-hardened cam head, and precise CNC machining, it delivers consistent brake engagement, reliability under heavy loads, and OEM-quality performance.