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

Dorman - First Stop Brake Master Cylinder P/N:M630428

Be the first to review this product
$145.99
MPN: M630428
UPC: 885484004139
Item Package Quantity: 1
Adding to cart… The item has been added

Have questions?

Ask an Expert
Dorman - First Stop Brake Master Cylinder P/N:M630428
Dorman - First Stop Brake Master Cylinder P/N:M630428
$145.99

Turn brake-pedal effort into the hydraulic pressure that operates the brake circuits with the Dorman - First Stop Brake Master Cylinder M630428. Engineered to match the original master cylinder's design, function, and performance on the listed application, it drops in as a direct-fit replacement for the 2004-2008 Mazda 3 [All] and features an aluminum housing, a 1 in bore, and two outlets that feed the vehicle's brake lines.

  • 100% new: made entirely of new materials, not remanufactured.
  • Precise replacement: the aluminum cylinder housing is cast to match the original part's casting material for similar performance.
  • Durable design: all rubber components use a high-quality EPDM compound that resists glycol-based brake fluid.
  • Strict specifications: built to meet SAE International standards, with an included reservoir and sensor.

Both outlets use an M10 x 1.0 thread with a 1 mm primary outlet thread pitch. Mounting hardware is not included. If a failed master cylinder is the cause of a sinking or spongy brake pedal, low pedal, or brake-fluid leak, this unit replaces it; diagnose the cause first, as those symptoms can have other sources. Made in Taiwan.

Interchange: 100-1794 · 1001794 · 13-3109 · 133109 · 11-3109 · 113109 · 130.45423 · 355-80076 · 35580076 · M55313 · BNYR4340Z · BNYR4340ZA · BPYS4340ZA · BPYS4340ZR0B · MR527633 · MC391048 · F142627 · MC142627 · MWMMC900077
Manufacturer part number M630428

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

100-1794, 13-3109, 11-3109, 130.45423, 355-80076, M55313, BNYR4340Z, BNYR4340ZA, BPYS4340ZA, BPYS4340ZR0B, MR527633, MC391048, F142627, MC142627, MWMMC900077

Frequently Asked Questions

What vehicle does this master cylinder fit?

It's a direct-fit replacement for the 2004-2008 Mazda 3 (All). Check the Buyer's Guide tab to confirm it matches your specific vehicle before ordering.

Does it include a reservoir and sensor?

Yes. Per the catalog, this unit includes the reservoir and sensor. Mounting hardware is not included—consult the vehicle service information for the correct fasteners and whether they may be reused.

What are the bore size and outlet details?

It has a 1 in bore and two outlets. Both outlets use an M10 x 1.0 thread, with a 1 mm primary outlet thread pitch.

Is this a remanufactured master cylinder?

No. It's 100% new, made entirely of new materials—not remanufactured—and built to meet SAE International standards. The housing is aluminum.

How do I know if my master cylinder needs replacing?

Signs it may need replacing include a sinking or spongy brake pedal, a low pedal, or brake-fluid leaks. Diagnose the cause first, since these symptoms can have other sources.

Related Products

!