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Dorman - First Stop Brake Master Cylinder P/N:M390089
$137.99
Convert brake-pedal force into the hydraulic pressure your brake system needs with the Dorman First Stop Brake Master Cylinder M390089. It installs as a direct-fit replacement for the 1992-2000 Mitsubishi Montero [All], the 1997-1999 Mitsubishi Montero Sport [All], and the 2001-2003 Mitsubishi Montero Sport [All].
Dorman precision-engineers this unit to the design, function, and performance of the original master cylinder on the listed applications, so it goes in like the factory part.
- Aluminum housing: the cylinder housing is built to match the casting material of the original part for similar performance, with a 0.938 in bore.
- Two outlets: primary and secondary outlets with M10 x 1.0 threads (1 mm pitch) feed the dual brake circuits; the reservoir is included.
- Durable EPDM seals: the 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 built to meet rigorous SAE International standards.
A sinking or spongy brake pedal, or fluid loss without an external leak, can be signs the master cylinder may need replacing — diagnose the cause before ordering. Mounting hardware and a fluid-level sensor are not included; consult the vehicle service information for the correct fasteners and whether they may be reused. Made in Taiwan.
Interchange: 18M611 · 83-16307 · 8316307 · M900820 · 100-1858 · 1001858 · M-52307 · M52307 · 072-8903 · 0728903 · 12647 · 13-2752 · 132752 · 11-2752 · 112752 · 130.46307 · 13046307 · MC502850 · 355-72035 · 35572035 · M52752 · NM52752 · MB618717 · MC390089 · F133792 · MC133792 · Manufacturer part number M390089.
This part cross-references / interchanges with the following part numbers:
18M611, 83-16307, M900820, 100-1858, M-52307, 072-8903, 12647, 13-2752, 11-2752, 130.46307, MC502850, 355-72035, M52752, NM52752, MB618717, MC390089, F133792, MC133792
Frequently Asked Questions
What does this master cylinder do?
It converts the force from your brake pedal into hydraulic pressure, sending it through two outlets to operate the vehicle's brake circuits.
Does it fit my vehicle?
It's a direct-fit replacement for the 1992-2000 Mitsubishi Montero and the 1997-1999 and 2001-2003 Mitsubishi Montero Sport. Check the Buyer's Guide tab to confirm your vehicle.
Is the reservoir included?
Yes, the reservoir is included. A fluid-level sensor and mounting hardware are not included.
What is it made of?
The housing is aluminum, built to match the original part's casting material, and the rubber components use an EPDM compound that resists glycol-based brake fluid. It's 100% new, not remanufactured.
What are signs my master cylinder may need replacing?
A sinking or spongy pedal, or brake fluid loss with no external leak, can be signs. Diagnose the cause before replacing, since other components can produce these symptoms.
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Dorman - First Stop Brake Master Cylinder P/N:M390089
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