When a high‑speed web‑press must halt the moving paper web for registration or a change‑over, the disc‑brake assembly supplies the controlled stopping force required to keep the web from overshooting. Mounted directly on the drive shaft of the transport rollers, the brake engages instantly as the control system commands a stop, converting kinetic energy into heat and holding the rollers in place. This reliable hold lets operators perform precise sheet‑alignment, register color plates, or switch inks without the web slipping or stretching, which would otherwise cause misregistration, waste, and downtime. In offset and digital presses the brake is also used during the winding phase to keep the take‑up reel steady, preventing tension spikes that could damage the substrate. The same principle is applied in high‑volume folding units, where a quick, repeatable lock on the feed rollers ensures each sheet is positioned accurately before the folding knives engage. By providing a dependable, repeatable braking point, the disc‑brake assembly supports continuous operation and fast change‑overs in modern printing and publishing lines.