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Dorman - First Stop Brake Master Cylinder P/N:M630309
$161.99
Convert every brake-pedal push into the controlled hydraulic pressure that operates your truck's brake circuits with the Dorman - First Stop Brake Master Cylinder M630309. It installs as a direct-fit replacement for the 2003-2005 Dodge Ram 2500 and 2003-2005 Dodge Ram 3500 (All engines), and it's engineered to match the design, function, and performance of the original master cylinder on those applications.
- Aluminum housing: built to match the casting material of the original part for similar performance.
- Durable EPDM seals: all rubber components use a high-quality EPDM compound for resistance to glycol-based brake fluid.
- 100% new: made entirely of new materials, not remanufactured, and made to meet rigorous SAE International standards.
- Specs & contents: two outlets with a 0.938 in bore; rearward outlet M10 x 1.0, secondary outlet thread M12 x 1.0, 1 mm primary outlet thread pitch. Reservoir and sensor included; mounting hardware not included.
Because a failing master cylinder can produce a sinking or spongy pedal, diagnose the cause first; if the original master cylinder is the source, this unit replaces it. Country of origin: China.
Interchange: 13682 · 13-4437 · 134437 · 10-4437 · 104437 · 130.67027 · 5093407AA · 355-40064 · 35540064 · M3081 · NM3081 · MC390782 · F140681 · MC140681
Manufacturer part number M630309
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
What vehicles does the M630309 fit?
It's a direct-fit replacement for the 2003-2005 Dodge Ram 2500 and 2003-2005 Dodge Ram 3500 (All engines). Check the Buyer's Guide tab to confirm it matches your truck.
Does it include a reservoir and sensor?
Yes. The reservoir and sensor are included. Mounting hardware is not included, so consult your vehicle service information for the correct fasteners and whether they may be reused.
What is this master cylinder made of?
The housing is aluminum, built to match the casting material of the original part, and all rubber components use a high-quality EPDM compound for resistance to glycol-based brake fluid.
What are the outlet and bore specifications?
It has two outlets with a 0.938 in bore. The rearward outlet is M10 x 1.0 and the secondary outlet thread is M12 x 1.0, with a 1 mm primary outlet thread pitch.
What are signs the master cylinder may need replacing?
A sinking or spongy brake pedal, a pedal that slowly drops under steady pressure, or unexplained brake-fluid loss. Diagnose the cause first; if the master cylinder is the source, this replaces it.
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Dorman - First Stop Brake Master Cylinder P/N:M630309
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