Dorman - First Stop Brake Master Cylinder P/N:M630521

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$187.99
MPN: M630521
UPC: 885484083738
Item Package Quantity: 1
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Dorman - First Stop Brake Master Cylinder P/N:M630521
Dorman - First Stop Brake Master Cylinder P/N:M630521
$187.99

Turn pedal effort into hydraulic pressure with the Dorman brake master cylinder M630521 from Dorman - First Stop. It is a direct-fit replacement for the 2010-2013 Ford Transit Connect (engine: All). Dorman precision-engineered it to match the original master cylinder's design, function and performance on the listed application.

  • Precise replacement: The aluminum cylinder housing is built to match the original part's material, helping deliver similar performance.
  • Brake-fluid resistance: Every rubber component uses a high-quality EPDM compound that resists glycol-based brake fluid.
  • 100% new: Built entirely from new, high-quality materials, intended to provide a safe, durable replacement.
  • Strict specifications: Built to meet rigorous SAE International standards.

A worn or leaking master cylinder may cause a soft or slowly sinking brake pedal. If the original unit is the cause, the M630521 is designed to replace it. It has a 0.938-inch bore diameter and two outlets. The secondary outlet thread is M12 x 1.0, and the primary outlet thread pitch is 1 mm. The listed application uses one master cylinder per vehicle.

The package contains the master cylinder only. The reservoir, sensor and mounting hardware are not included. Transfer or replace the reservoir and any sensor as the service procedure directs. Consult the vehicle service information for the correct fasteners and whether they may be reused. Country of origin: China.

Interchange: 100-2899 · 13-4483 · 10-4348 · 130.65134 · 355-54250
7T1Z2004A · 7T1Z2004B · NM4257 · NM4336 · MC391254 · R144348 · R144483 · 1002899 · 134483 · 104348 · 13065134 · 35554250

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

100-2899, 13-4483, 10-4348, 130.65134, 355-54250, 7T1Z2004A, 7T1Z2004B, NM4257, NM4336, MC391254, R144348, R144483

Frequently Asked Questions

Does this include a Dorman master cylinder bleeder kit?

No. The package contains the master cylinder only. The reservoir, sensor and mounting hardware are also not included.

What vehicle does the M630521 fit?

It is listed for the 2010-2013 Ford Transit Connect with engine code All. The application uses one master cylinder per vehicle.

What are the bore and outlet specifications?

It has a 0.938-inch bore diameter and two outlets. The secondary outlet thread is M12 x 1.0, and the primary outlet thread pitch is 1 mm.

What are signs a master cylinder may need replacing?

Common signs include a spongy pedal, a pedal that slowly sinks under steady pressure, or fluid leaking at the unit. Other brake parts can cause these symptoms, so diagnose the system first.

Does it need to be bled before installation?

Master cylinders are generally bench-bled before installation, and the brake system is bled afterward. Follow the vehicle service information for the correct procedure.