Help keep hydraulic pressure flowing to your brakes with the Dorman First Stop Brake Master Cylinder M390378, a direct-fit 1997-2006 Jeep Wrangler master cylinder (all engines) that also fits the 1997-1998 Dodge Dakota (all engines). When you press the pedal, the master cylinder converts that force into hydraulic pressure and sends it through the brake lines to the wheels.
Dorman precision-engineers this unit to match the original master cylinder's design, function and performance on the listed applications. It is built from new, high-quality materials for a safe, durable replacement.
- Precise replacement: the aluminum cylinder housing is constructed to match the casting material of the original part for similar performance.
- Durable design: every rubber component uses a high-quality EPDM compound that resists glycol-based brake fluid.
- 100% new: made entirely from new materials for quality and safety.
- Strict specifications: built to meet rigorous SAE International standards.
Specifications: 1 in. bore diameter · 2 outlets · rearward outlet M10 x 1.0 · secondary outlet thread M12 x 1.0 · primary outlet thread pitch 1 mm · reservoir included · no sensor included · mounting hardware not included. Country of origin: China.
Signs a master cylinder may need replacing include a soft or sinking brake pedal, fluid leaking around the cylinder or reservoir, or a brake fluid level that keeps dropping. Other brake components can cause similar symptoms, so diagnose the cause before replacing, and bleed the brake system after installation as directed by the vehicle service procedure.
Interchange: 783-40017 · 83-40017 · 100-2673 · M-87017 · 13-2708 · 10-2708 · 130.67017 · 131.67017 · 355-42029
78340017 · 8340017 · 1002673 · M87017 · 132708 · 102708 · 13067017 · 13167017 · 35542029 · 18M802 · M901037 · 13279 · 4798157 · MC131964 · M3041 · NM3041 · MC390378 · F131964 · F140282
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
