Dorman M630836 Brake Master Cylinder

Dorman M630836 Brake Master Cylinder

The Dorman M630836 brake master cylinder is a direct replacement for select Audi brake systems that use a 1-inch bore and dual outlet design. Built from new aluminum materials, it is engineered to match the original master cylinder’s design, function, and performance for a dependable brake hydraulic repair.

Key Features

• Brake master cylinder for brake hydraulic service
• 1-inch master cylinder bore diameter
• Aluminum master cylinder construction
• Two outlet ports with M12 x 1.0 thread size
• No reservoir included
• No sensor included
• Package contents: master cylinder

Detailed Description

Designed for select Audi A4, A4 Quattro, A5, A5 Quattro, S4, S5, A4 allroad, allroad, A8 Quattro, and S8 applications, the Dorman M630836 brake master cylinder supports OE-style brake system restoration where the original unit has worn, leaked, or lost hydraulic performance. This part cross-references Raybestos Brakes MC391422 for the same application. It also cross-references Centric Parts 130.33132 for the same application.

Use this master cylinder when servicing Audi brake systems that require a 1-inch bore and dual M12 x 1.0 outlet configuration. The aluminum body helps maintain a precise fit and consistent hydraulic operation in the original brake layout. Part number M630836 is a practical replacement choice for Audi brake master cylinder repair on vehicles with Girling-TRW brake setups where noted in the fitment data.

What It Is Used For

• Replacing a leaking brake master cylinder
• Restoring firm brake pedal response after hydraulic wear
• Addressing internal bypass or loss of brake pressure
• Repairing brake fluid seepage at the master cylinder body or outlets
• Returning proper hydraulic function to select Audi brake systems

Installation Notes and Tips

Verify the vehicle’s brake system configuration before installation, including Girling-TRW brake notes and any armored-body exclusions listed in the fitment data. This master cylinder does not include a reservoir, sensor, or mounting hardware, so reuse or source the required related components as needed. Always bleed the brake system thoroughly after installation and confirm all outlet connections match the M12 x 1.0 thread specification.

Quality Assurance

Dorman manufactures this brake master cylinder as a new, high-quality replacement built to match the original part’s design and function on the listed Audi applications. Part number M630836 is engineered for safe, durable brake system service on the specified fitments.

Compatible Vehicles

• Fits 2014-2018 Audi A8 Quattro, N/A. Not suitable for Armored Car.
• Fits 2014-2018 Audi S8, N/A. Not suitable for Armored Car.
• Fits 2013-2017 Audi A4 allroad, N/A. Exc. Armored Body; Girling-TRW Cylinder.
• Fits 2014-2016 Audi allroad, N/A. Not suitable for Armored Car.
• Fits 2011-2013 Audi A8 Quattro, N/A. Exc. Armored Car; w/Girling-TRW Brakes.
• Fits 2013 Audi allroad, N/A. Exc. Armored Car; w/Girling-TRW Brakes.
• Fits 2013 Audi S8, N/A. Exc. Armored Car; w/Girling-TRW Brakes.
• Fits 2010-2012 Audi A4, N/A. w/Girling-TRW Brakes.
• Fits 2010-2012 Audi A4 Quattro, N/A. w/Girling-TRW Brakes.
• Fits 2010-2012 Audi A5, N/A. w/Girling-TRW Brakes.
• Fits 2008-2012 Audi A5 Quattro, N/A. w/Girling-TRW Brakes.
• Fits 2010-2012 Audi S4, N/A. w/Girling-TRW Brakes.
• Fits 2008-2012 Audi S5, N/A. w/Girling-TRW Brakes.