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Dorman M39971 Brake Master Cylinder OEM Replacement 1.000 in. Bore

(1996 Acura TL; 1996-1997 Acura RL; 1991-1995 Acura Legend; 1981-1985 Mazda GLC)

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

M39971
4 reviews
Sale Price

$89.11

In Stock (5)

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Usually delivered within 2 days

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No Hassle Returns

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Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Dorman M39971 is a 100% new OEM-replacement brake master cylinder engineered to restore proper braking performance. Featuring a 1.000-inch bore diameter and dual-outlet design, this unit is built to match the original part's dimensions and function exactly — no modifications required for a direct-fit installation.

Unlike remanufactured alternatives, this master cylinder is made entirely from new materials, delivering consistent, reliable stopping power right out of the box. The cylinder housing is cast to match the material of the original part, and all internal rubber components are manufactured from high-quality EPDM compound for excellent resistance to glycol-based brake fluid and long-term durability.

Key Features:

  • 1.000 in. bore diameter — direct OE-spec replacement
  • Dual outlet ports — power brake compatible
  • 100% new construction — not remanufactured, ensuring consistent quality and safety
  • EPDM rubber internals — resistant to glycol-based brake fluids for extended service life
  • OE-matched casting material — housing mirrors original for precise fit and performance
  • SAE International standards — manufactured to meet rigorous industry specifications

The Dorman M39971 is a dependable, cost-effective solution for restoring safe, confident braking without the unpredictability of a remanufactured unit.

Products specifications

Fits

1996 Acura TL; 1996-1997 Acura RL; 1991-1995 Acura Legend; 1981-1985 Mazda GLC

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

Thread Pitch

1.0

Sensor Included

Yes

Master Cylinder Material

Aluminum

Rearward Outlet Size

M12 X 1.0

Secondary Outlet Thread Diameter

10

Reservoir Included

Yes

Number of Outlets

2

Mounting Hardware Included

No

Master Cylinder Bore Diameter

1

Package Contents

Master Cylinder

Primary Outlet Thread Pitch

1 mm

Fast! Fast, fast, Fast! Fast, fastFast! Fast, fast

good service, shipping was quick

very quick, easy, and we'll laid out

These guys had a part that I was searching for for a long time. Not only that, but they had 2 in stock when nobody else did. I will definitely be looking here first next time I am buying auto parts.

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