Dorman M39884 Brake Master Cylinder - 100% New Aluminum, 15/16 in. Bore

The Dorman M39884 is a 100% new brake master cylinder engineered as a direct OEM replacement. Constructed with an aluminum cylinder housing matched to the casting material of the original part, this unit delivers consistent hydraulic pressure and braking performance right out of the box — with no core exchange required.

Key Features:

• Bore Size: 15/16 in. (0.937 in.) for proper hydraulic output
• Cylinder Material: Aluminum with a natural finish
• EPDM Rubber Components: All internal seals and rubber parts are made of high-quality EPDM compound, providing excellent resistance to glycol-based brake fluids
• Power Brake Compatible: Designed to work with power brake booster systems
• Dual Outlet Design: Features 2 outlets with M10 x 1.0 thread size
• Includes: Reservoir cap and brake fluid level sensor
• 100% New Construction: Not remanufactured — built entirely from new materials for maximum reliability and safety
• SAE Compliant: Manufactured to meet rigorous SAE International standards

Cross-references: M900698, 072-8686, MC250110, M52544, NM52544, F119578, MC119578, 18M491, MC39884, 130.40015, 131.40015, 13-2544. OEM reference numbers include 46100SK7A01, 46100SK7A02, 46100SK7A03, 46100ST7003, and 46100ST7013.

Dorman's First Stop brake master cylinders are a trusted aftermarket solution, backed by over 100 years of automotive parts engineering. This unit is built to restore full braking system confidence without the uncertainty of a remanufactured part.