Hot Rod Hardware stocks master cylinders and reservoirs, including brake master cylinder conversion kits, for classic car, hot rod, and muscle car brake systems spanning 1920s Fords through modern pro-touring builds. The lineup covers single and dual reservoir setups, disc and drum conversion cylinders, and replacement units from Pete and Jake's, Master Power Brakes, Chassis Engineering, and OTB Gear. Whether you're upgrading a manual drum system to power disc brakes or replacing a failing cylinder on a numbers-matching restoration, this collection groups every bore size and mounting configuration the catalog carries into one page. Pair a new master cylinder with a matching proportioning valve and booster from the Master Power Brakes lineup for a complete brake system overhaul, or shop by bore diameter if you already know your specification. Chevrolet and Ford owners will find the widest fitment coverage, especially for Tri-Five Bel Air brake upgrades, HRH's top revenue platform. Every listing includes fitment notes for common hot rod and muscle car platforms, so you can confirm compatibility before you buy.