Turn brake-pedal effort into the hydraulic pressure that works your brakes with the Dorman - First Stop Brake Master Cylinder (MPN M630304). It drops in as a direct-fit replacement for the 2004-2006 Chrysler Pacifica, 2003-2007 Chrysler Town & Country, 2003 Chrysler Voyager, 2003-2007 Dodge Caravan, and 2003-2007 Dodge Grand Caravan [All engines]. This dual-outlet unit ships 100% new — not remanufactured — with the reservoir and sensor included.
- Aluminum housing: the cylinder housing is built to match the casting material of the original part for similar performance.
- EPDM rubber components: the rubber parts use a high-quality EPDM compound that resists glycol-based brake fluid.
- Built to standard: made to meet rigorous SAE International standards.
- Key specs: 1 in bore diameter and two outlets, with M12 x 1.0 secondary/rearward outlet threads at a 1 mm pitch.
As the core of the hydraulic brake system, the master cylinder pressurizes brake fluid and routes it to the brake circuits when you press the pedal. Signs this part may need replacing include a pedal that slowly sinks toward the floor, feels spongy, or shows a loss of hydraulic pressure — if a failed master cylinder is the cause, this replaces it. Diagnose the cause before replacing. Mounting hardware is not included; consult the vehicle service information for the correct fasteners and whether they may be reused. Country of origin: China.
Interchange: 100-2689 · 1002689 · 13929 · 13-3090 · 133090 · 10-3090 · 103090 · 130.67031 · 131.67031 · 4721154AA · 4721154AB · 4721154AC · 4721154AD · MC512620 · 355-40068 · 35540068 · M4075 · NM4075 · MC390823 · F141584 · MC141584. Manufacturer part number M630304.
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does this brake master cylinder do?
It converts the force from your brake pedal into hydraulic pressure, sending brake fluid through its two outlets to the vehicle's brake circuits.
Does it include a reservoir and sensor?
Yes. Per the catalog, both the reservoir and the sensor are included. Mounting hardware is not included.
Which vehicles does it fit?
It's a direct-fit replacement for the 2004-2006 Chrysler Pacifica, 2003-2007 Town & Country, 2003 Voyager, and 2003-2007 Dodge Caravan and Grand Caravan. See the Buyer's Guide tab for full details.
What are signs the master cylinder may need replacing?
A brake pedal that slowly sinks to the floor, feels spongy, or a loss of hydraulic pressure. Diagnose the cause first, since other components can produce these signs.
What are the bore and outlet specs?
It has a 1-inch bore diameter and two outlets, with M12 x 1.0 outlet threads at a 1 mm pitch.