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Dorman M39403 Brake Master Cylinder OE Replacement

(1976-1978 Toyota Pickup; 1989-1995 Mazda MPV; 1988-1991 Mazda 929 Base; 1990-1991 Mazda 929 S)

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

M39403
6 reviews
Sale Price

$93.37

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 M39403 is a direct-fit replacement brake master cylinder engineered to restore proper braking system function. Precision-manufactured to match the original equipment specifications, this unit delivers the same hydraulic performance as the factory master cylinder it replaces.

Key Features:

  • Direct OE replacement — matches the design, fit, and function of the original master cylinder
  • Manufactured from new, high-quality materials for long-lasting durability and safe operation
  • Precision-engineered internal components ensure consistent hydraulic pressure delivery
  • Built to meet or exceed original equipment performance standards
  • No core return required — new unit, not a remanufactured part

The Dorman M39403 brake master cylinder is a critical safety component that converts brake pedal input into hydraulic pressure, activating the brake calipers and wheel cylinders throughout the braking system. Choosing a quality OE-equivalent replacement helps maintain reliable stopping power and overall brake system integrity.

Products specifications

Fits

1976-1978 Toyota Pickup; 1989-1995 Mazda MPV; 1988-1991 Mazda 929 Base; 1990-1991 Mazda 929 S

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

Package Contents

Master Cylinder

Master Cylinder Bore Diameter

0.938

Number of Outlets

2

Thread Pitch

1.0

Rearward Outlet Size

M10 X 1.0

Master Cylinder Material

Cast iron

Sensor Included

No

Secondary Outlet Thread Diameter

10

Reservoir Included

Yes

Mounting Hardware Included

No

good price

Did an extensive search on line to find the best price available, and autoplicity was definitely the best. Now I no longer need to spend more time searching, I will go straight to autoplicity!

My second time ordering from Autoplicity. I price shop online and Autoplicity had the lowest price both times. Fast ship with email notifications. Autoplicity will now be my "First" site I go to for my auto accessories. Great job Autoplicity.

Very happy with the speed of shipping and with the reasonable price of the product.

Great prices for the parts I needed to replace on my SUV, a bit hard to reach customer service when I had a question about the order. When I finally did reach CS, question was answered without any issues, shipping costs seem a bit high.

Great prices and very quick shipping! Thanks

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