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Dorman - First Stop Brake Master Cylinder P/N:M631030
$164.99
Turn brake-pedal pressure into reliable hydraulic force with the Dorman - First Stop Brake Master Cylinder M631030, a direct-fit replacement for the 2013-2020 Dodge Journey (All engines). A master cylinder converts the force you apply at the pedal into hydraulic pressure, pushing brake fluid out to the vehicle's brake circuits.
- 100% new: built entirely from new materials, not remanufactured.
- Aluminum housing: cast to match the casting material of the original part for similar performance.
- EPDM rubber components: made from a high-quality EPDM compound for resistance to glycol-based brake fluid.
- Strict specifications: made to meet rigorous SAE International standards.
It has a 1.063 in bore diameter, two outlets each in a 7/16-24 in thread size, and two mounting holes. The reservoir, master cylinder cap, mounting hardware, mounting bracket, push rod, sensor, and bleeder hoses are not included — transfer or source these separately per the vehicle service information. If a failed master cylinder is the cause of a spongy pedal, a pedal that slowly sinks, or brake-fluid loss, this unit replaces it; diagnose the cause first, since other components can produce those signs. Country of origin: China.
Interchange: 100-4318 · 1004318 · 130.67052 · 68155423AC · NM4325 · MC391500 · MC146059 · Manufacturer part number M631030
This part cross-references / interchanges with the following part numbers:
100-4318, 130.67052, 68155423AC, NM4325, MC391500, MC146059
Frequently Asked Questions
What does this brake master cylinder do?
It converts the force from your brake pedal into hydraulic pressure, sending brake fluid to the vehicle's brake circuits. If a failed master cylinder is the cause of your brake trouble, this M631030 replaces it.
Will this fit my vehicle?
It's a direct-fit replacement for the 2013-2020 Dodge Journey (All engines). Check the Buyer's Guide tab to confirm it matches your vehicle.
Does it come with a reservoir, cap, or mounting hardware?
No. The reservoir, master cylinder cap, mounting hardware, mounting bracket, push rod, sensor, and bleeder hoses are not included. Transfer or source these separately per the vehicle service information.
What are the bore and outlet specs?
It has a 1.063 in bore diameter, two outlets each in a 7/16-24 in thread size, and two mounting holes.
What are signs my master cylinder may need replacing?
Signs may include a brake pedal that feels spongy or slowly sinks to the floor, or unexplained brake-fluid loss. Diagnose the cause before replacing, since other components can produce these symptoms.
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Dorman - First Stop Brake Master Cylinder P/N:M631030
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