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Dorman M390390 Brake Master Cylinder with 1.25 In. Bore

(Jeep Wrangler 2007-11; Dodge Ram 2500 1997-2003, Ram 1500 2004-06, Ram 3500 1997-2003, Grand Caravan 2001-10, Caravan 2001-07, Viper 1997-2006 + 7 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

M390390
6 reviews
Sale Price

$105.79

In Stock (5)

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Usually delivered within 2 days

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Fitment guaranteed

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Product Details

The Dorman M390390 is a 100% new replacement brake master cylinder engineered to restore proper braking system function. With a 1.25-inch bore diameter, this unit is built to match the original part's design, dimensions, and performance characteristics — no modifications required for a proper fit.

Key Features:

  • Precise OE Replacement: Cylinder housing is constructed to match the casting material of the original part for consistent, reliable performance
  • Durable EPDM Rubber Components: All internal rubber seals and components are manufactured 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 standards of safety and longevity
  • SAE-Compliant: Engineered to meet rigorous SAE International standards for hydraulic brake system components
  • Vacuum Booster Compatible: Designed for use with power brake systems equipped with a vacuum booster

The Dorman M390390 brake master cylinder is an ideal solution for restoring safe, responsive braking performance on equipped vehicles. As a brand-new unit, it eliminates the uncertainty often associated with remanufactured parts and delivers a direct-fit installation experience.

Products specifications

Fits

Jeep Wrangler 2007-11; Dodge Ram 2500 1997-2003, Ram 1500 2004-06, Ram 3500 1997-2003, Grand Caravan 2001-10, Caravan 2001-07, Viper 1997-2006; Chrysler Town & Country 2001-10, Pacifica 2005-08, Voyager 2001-03 + 4 more models

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

Master Cylinder Bore Diameter

1.25

Reservoir Included

Yes

Secondary Outlet Thread Diameter

7/16-24

Package Contents

Master Cylinder

Rearward Outlet Size

9/16-18

Number of Outlets

3

Master Cylinder Material

Aluminum

Sensor Included

Yes

Mounting Hardware Included

No

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