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Dorman M630447 New Brake Master Cylinder OE Replacement

(1990-1991 Pontiac Grand Prix; 1989-1993 Pontiac Grand Am; 1990-1991 Oldsmobile Cutlass Supreme; 1988-1991 Oldsmobile Cutlass Calais + 4 more models)

Part of: Dorman Brake Master Cylinder Replacement

Other options in this family: Dorman M39298 Dorman M19012 Dorman M390139 Dorman M630735 Dorman M390200

Manufacturer

Picture for manufacturer Dorman

Part Number

M630447
7 reviews
Sale Price

$129.77

In Stock (5)

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Usually delivered within 2 days

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FREE SHIPPING

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No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Dorman M630447 is a 100% new replacement brake master cylinder precision-engineered to match the design, function, and performance of the original equipment part. As the heart of the hydraulic braking system, the master cylinder converts brake pedal pressure into hydraulic force, activating the calipers and wheel cylinders to bring your vehicle to a safe stop. This direct-fit replacement restores proper braking performance without the cost of a dealer part.

Key Features:

  • Precise OE Replacement: Cylinder housing is constructed to match the casting material of the original part for accurate fit and similar performance
  • Durable Rubber Components: All internal seals and rubber parts are made from high-quality EPDM compound, providing excellent resistance to glycol-based brake fluid
  • 100% New Construction: Made entirely from new materials — not remanufactured — ensuring the highest levels of quality and safety
  • SAE-Compliant: Built to meet rigorous SAE International standards for hydraulic brake system components
  • Direct-Fit Design: Engineered to install in the same location as the original master cylinder with no modification required

Dorman has been delivering trusted aftermarket solutions for over 100 years. The M630447 brake master cylinder offers a reliable, cost-effective alternative to OEM dealership pricing while maintaining the safety and performance your braking system demands.

Products specifications

Fits

1990-1991 Pontiac Grand Prix; 1989-1993 Pontiac Grand Am; 1990-1991 Oldsmobile Cutlass Supreme; 1988-1991 Oldsmobile Cutlass Calais; 1992-1993 Oldsmobile Achieva; 1990-1993 Buick Skylark; 2002 Freightliner Sprinter 2500; 1990-1993 Chevrolet Beretta

Feature - Benefit 1

Cylinder housing is constructed from high-quality cast iron or aluminum for long-lasting durability

Feature - Benefit 2

All rubber components are of high-quality EPDM compound for resistance to glycol-based brake fluid

Feature - Benefit 3

Direct replacement for a proper fit

Feature - Benefit 4

Manufactured to strict engineering quality standards, each Brake Master Cylinder meets S.A.E. specifications

Mounting Hardware Included

No

Package Contents

Master Cylinder

Reservoir Included

No

Rearward Outlet Size

M10 X 1.0

Thread Pitch

1.0

Number of Outlets

2

Secondary Outlet Thread Diameter

10

Sensor Included

No

Master Cylinder Bore Diameter

0.938

Master Cylinder Material

Cast iron

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Great prices very fast shipping!!!

Autoplicity had the lowest price online for the product I needed. I will definitely buy from them again.

A very good price on items. Very quick response and delivery. Thanks

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I would definitely recommend Autoplicity. I ordered Thule bike racks (THU-518), and the products arrived in 2 days in perfect condition. Plus the prices (along with free shipping) were the best on the web.

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