Dyno is a compilation of 13 years of brake design starting with the original Mag brake in 1997. It has an industry first piston and master cylinder bore design inspired by the powerful Prime brake platform. This is our most durable design to date.
Buy Hayes Master Cylinder Assembly - Dyno Comp from Chain Reaction Cycles, the World’s Largest Online Bike Store.
If you're not completely satisfied with an item you may return it within 12 months of purchase. We'll give you a full refund if the item hasn't been used or the component hasn’t been fitted.More information on returns