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Dorman - First Stop Brake Master Cylinder P/N:M390378
$107.99
Convert brake-pedal force into the hydraulic pressure that operates the brake system with the Dorman - First Stop Brake Master Cylinder M390378. It installs as a direct-fit replacement for the 1997-1998 Dodge Dakota and 1997-2006 Jeep Wrangler (all engines), and is engineered to match the design, function and performance of the original master cylinder on those applications.
Key features:
- Aluminum construction: the cylinder housing is built to match the casting material of the original part for similar performance, with a 1-inch bore and two outlets (rearward M10 x 1.0, secondary M12 x 1.0).
- Fluid-resistant 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 produced to meet rigorous SAE International standards.
- Reservoir included: ships with the fluid reservoir; no sensor and no mounting hardware are included.
A worn or failing master cylinder can show up as a spongy or slowly sinking brake pedal or fluid seepage; if the master cylinder is the cause, this unit replaces it. Because 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: 18M802 · 783-40017 · 78340017 · 83-40017 · 8340017 · M901037 · 100-2673 · 1002673 · M-87017 · M87017 · 13279 · 13-2708 · 132708 · 10-2708 · 102708 · 130.67017 · 131.67017 · 4798157 · MC131964 · 355-42029 · 35542029 · M3041 · NM3041 · MC390378 · F131964 · F140282. Manufacturer part number M390378.
This part cross-references / interchanges with the following part numbers:
18M802, 783-40017, 83-40017, M901037, 100-2673, M-87017, 13279, 13-2708, 10-2708, 130.67017, 131.67017, 4798157, MC131964, 355-42029, M3041, NM3041, MC390378, F131964, F140282
Frequently Asked Questions
What does this brake master cylinder do?
It converts the force you apply at the brake pedal into the hydraulic pressure that operates the brake system.
What vehicles does the M390378 fit?
It's a direct-fit replacement for the 1997-1998 Dodge Dakota and 1997-2006 Jeep Wrangler (all engines). Check the Buyer's Guide tab to confirm your vehicle.
Does it come with a reservoir?
Yes, it ships with the fluid reservoir. It does not include a sensor or mounting hardware.
What is this master cylinder made of?
The cylinder housing is aluminum, built to match the original casting material, and all rubber components use an EPDM compound that resists glycol-based brake fluid.
How do I know if my master cylinder needs replacing?
Signs may include a spongy or slowly sinking brake pedal or fluid leaks. Have the system diagnosed first, since these symptoms can have other causes.
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Dorman
Dorman - First Stop Brake Master Cylinder P/N:M390378
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