Hydraulic

Sheldon Brown's Bicycle Glossary · letter H
← Hybrid · Hydroplaning →

Operated by applying pressure to liquid in a tube. Some bicycles (and all automobiles) have hydraulic brakes, using liquid-filled tubing to connect the brake control lever to the caliper. Hydraulic brakes have less internal friction and are immune from cable stretch, but are expensive and harder to service than cable operated brakes.