Short Competition Master Cylinder

A hydraulic handbrake acts directly on the rear calipers. It locks the axle without routing through the cables, providing a clean, repeatable lockup - something the original cable can no longer achieve once the car gains weight or grip.

The master cylinder bore size is not a minor detail. The smaller it is, the faster pressure rises for the same lever effort, but the longer the stroke becomes. A 0.75" bore suits most standard rear calipers; a larger bore is reserved for calipers with large pistons.