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OPR Brake Master Cylinder (05-08 All)

Item 100954
AmericanMuscle no longer carries the OPR Brake Master Cylinder (05-08 All). Please check out 2005-2009 Mustang Brake Accessories for an updated selection.
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Features & Details

  • Regain Lost Braking Performance
  • Premium Quality Cast Aluminum
  • 100% New! - Not Re-Manufactured
  • Reuses Original Reservoir and Cap
  • Bore Size 27mm (1-1/16")
  • Front Outlet - M12x1.0; Rear Outlet - M12x1.0
  • Ford Motor Company Equivalent Part# 4R3Z-2140-AA, 6R3Z 2140-AA or BRMC9
  • Direct Bolt-on Installation
  • Fits All 2005-2008 Ford Mustang Models
More Stopping Power. Improve the stopping power of your S197 Mustang by replacing that old leaky Brake Master Cylinder with a brand new direct fit replacement from OPR for an inexpensive maintenance repair. This OPR Mustang Brake Master Cylinder is 100% brand new, not re-manufactured like other companies sell and it is fully tested at the time of assembly.

Premium Quality Construction. Cast from premium quality aluminum to the original factory specifications, this OPR Master Brake Cylinder features factory style connections with high-quality EPDM rubber compound seals. Manufactured to strict engineering quality standards, OPR Brake Master Cylinders meet or exceed S.A.E. specifications for years of reliable leak free operation.

Direct Fit Replacement. This OPR Master Brake Cylinder is a direct fit replacement for your Mustang’s original stock master cylinder, so it simply bolts into place. Seeing that installation requires bleeding the brake system professional installation is highly recommended.

Application. This OPR Master Brake Cylinder is a direct fit replacement for the 2005-2008 Mustangs, including V6, GT, Bullitt and Shelby GT500 models. Equivalent to Ford part# 4R3Z-2140-AA, 6R3Z 2140-AA or BRMC9.


Fitment: Details

CA Residents: WARNING: Cancer and Reproductive Harm -

What's in the Box
  • (1) Master Cylinder
Installation Info
Tech Specs
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        Customer Reviews (2) Write a Review

        Overall Rating 5

        out of 5 stars

        Installation Time:Weekend

        Installation Cost:$100-$250

        • Fit 5 5
        • Bang For Your Buck 4.5 4.5
        • Stopping Power 4.5 4.5

        • 5/5

          Installation Time: Shop Install

          Installation Cost: $100-$250

          December 23, 2014

          Perfect replacement!

          Great factory replacement. If yours is leaking and worn, replace it with this part form American Muscle. Works perfectly and well built.


          Year: 2006 Submodel: GT Georgia, USA

          Helpful (12)

        • 5/5

          Installation Time: Afternoon

          July 21, 2014

          Brake Master Cylinder

          Bought a couple of new brake master cylinders due to mine being pretty leaky. Great quality and fits like a champ. You can definitely feel the improved stopping power paired with high performance brake pads. I definitely recommend this brake master cylinder, thanks AM.


          Year: 2006 Submodel: V6 Midlothian,TX

          Helpful (13)

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