The brake master cylinders below are designed to replace the stock master cylinder for better performance and appearance. Great for street machines, show cars and race cars. MANUAL BRAKES TECH NOTE: Generally a 1" bore master cylinder is best with manual disc/drum brakes. Manual brake master cylinders have a smaller piston bore diameter to maintain sufficient fluid pressure in the braking system. They also have a deeper hole for the brake pedal pushrod. TECH NOTE: You can use a manual brake cylinder on a power brake system, but not vice-versa. The power brake cylinder's larger piston bore cannot supply the required level of hydraulic pressure required by manual brakes. POWER DISC/DISC TECH NOTE: Generally it is best to use the the 1 1/8" bore when using power assisted disc/disc brakes with larger aftermarket brake calipers. For OEM disc/disc brake applications, the 1 1/8" bore is usually the way to go. POWER DISC/DRUM TECH NOTE: Generally it is best to use the 1" bore for power disc/drum applications. A 1 1/8 bore can be used but may provide a very hard pedal. TECH NOTE: Use a deep hole model for manual brakes and a shallow hole model for power brakes. TECH NOTE: The above information is a general guide. With custom brake applications many variations can be used. Call us if you have a question as to which is best for your application. Tuff Stuff 2017NA Chrome Plated 1967-1974 Ford Power Brake Master Cylinder Tuff Stuff 2071NA 1968-1982 Corvette And Other Power Disc/Disc Chrome Plated 1 1/8 Bore-Shallow Hole Power Brake Master Cylinder Tuff Stuff 2018NA Disc/Drum GM and Hot Rod Chrome Plated 1" Bore-Shallow Hole Power Brake Master Cylinder Tuff Stuff 2019NA Disc/Drum GM and Hot Rod Chrome Plated 1" Bore-Deep Hole Manual Brake Master Cylinder Tuff Stuff 2020NA Dual 3/8" Port Disc/Drum Chrome Plated 1" Bore-Shallow Hole Manual Brake Master Cylinder Tuff Stuff 2021NA Dual 3/8" Ports Disc/Drum Chrome Plated 1" Bore-Deep Hole Manual Brake Master Cylinder Tuff Stuff 2023NA Polished Aluminum Disc/Drum 1" Bore-Shallow Hole Power Brake Master Cylinder HOURS: 11:00 am to 6:00 pm Monday - Friday Eastern Standard Time We welcome CANADIAN customers! For ordering information, click on "Orders To Canada" at the top left side of this page. We will not ship to freight forwarding - expediting companies. PAYMENT METHODS: PayPal, Visa, Mastercard, Discover, American Express, money orders.