Dorman - First Stop Brake Master Cylinder M630309
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Dorman - First Stop Brake Master Cylinder M630309
Dorman - First Stop Brake Master Cylinder M630309 - view 2
Dorman - First Stop Brake Master Cylinder M630309 - view 3
Dorman - First Stop Brake Master Cylinder M630309 - view 4

Brake Master Cylinder for 2003-2005 Dodge Ram 2500 & More - Dorman M630309

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$159.99
MPN: M630309
Item Package Quantity: 1
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Dorman - First Stop Brake Master Cylinder P/N:M630309
Dorman - First Stop Brake Master Cylinder P/N:M630309
$159.99

Turn brake pedal effort into hydraulic braking pressure with the Dorman First Stop Brake Master Cylinder M630309, a new master cylinder built as a direct-fit replacement for the 2003-2005 Dodge Ram 2500 and 2003-2005 Dodge Ram 3500 (all engines). Dorman designed this unit to replicate the design, function and performance of the original master cylinder on the listed trucks. It is made from new, high-quality materials for a safe, durable replacement.

  • Precise replacement: The aluminum cylinder housing is constructed to match the casting material of the original part, for similar performance.
  • Durable design: Every rubber component uses a high-quality EPDM compound that resists glycol-based brake fluid.
  • 100% new: Built entirely from new materials, with quality and safety in mind.
  • Strict specifications: Made to meet rigorous SAE International standards.

Specifications: 0.938 in. bore and two outlets. The rearward outlet is M10 x 1.0, the secondary outlet thread is M12 x 1.0, and the primary outlet thread pitch is 1 mm. A reservoir and sensor are included. Mounting hardware is not included, so consult the vehicle service information for the correct fasteners and whether the originals may be reused. Country of origin: China.

Interchange: 13-4437 · 10-4437 · 130.67027 · 355-40064
134437 · 104437 · 13067027 · 35540064 · 13682 · 5093407AA · M3081 · NM3081 · MC390782 · F140681 · MC140681

This part cross-references / interchanges with the following part numbers:

13682, 13-4437, 10-4437, 130.67027, 5093407AA, 355-40064, M3081, NM3081, MC390782, F140681, MC140681

Frequently Asked Questions

Is this the right master cylinder for a 2003-2005 Dodge Ram 2500?

It is a direct-fit replacement for the 2003-2005 Dodge Ram 2500 and the 2003-2005 Dodge Ram 3500 with all engines. The Buyer's Guide tab shows the full fitment details.

What does a brake master cylinder do?

It converts force from the brake pedal into hydraulic pressure and sends brake fluid through its outlets to the brake lines. This unit has a 0.938-inch bore and two outlets.

What comes in the box?

The box contains the master cylinder, with the reservoir and sensor included. Mounting hardware is not included, so consult the vehicle service information for the correct fasteners.

What are signs a master cylinder may need replacing?

Signs include a soft or sinking brake pedal, fluid leaking around the master cylinder, or a dropping fluid level. Other brake parts can cause these symptoms, so diagnose the system first.

What are the outlet thread sizes?

The rearward outlet is M10 x 1.0 and the secondary outlet thread is M12 x 1.0. The primary outlet has a 1 mm thread pitch.

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