Dorman - First Stop Brake Master Cylinder P/N:M630869

Turn brake-pedal effort into the hydraulic pressure that actuates your brake circuits with the Dorman - First Stop Brake Master Cylinder M630869. It drops in as a direct-fit replacement for the 2011-2015 Kia Optima (All engines), and Dorman engineers it to match the design, function, and performance of the original master cylinder on the listed applications.

• Aluminum housing: the cylinder housing is constructed to match the casting material of the original part for similar performance.
• Durable EPDM seals: all rubber components use a high-quality EPDM compound for resistance to glycol-based brake fluid.
• 100% new: built entirely from new materials, not remanufactured, and made to meet rigorous SAE International standards.
• Included: ships with the reservoir, master cylinder cap, sensor, and brake booster. Mounting hardware, mounting bracket, bleeder hoses, and push rod are not included — consult the vehicle service information for the correct fasteners and whether they may be reused.

The master cylinder takes the force delivered through the brake pedal and pushes fluid out to the brake circuits, so a firm pedal depends on it holding pressure internally. If a failing master cylinder is the cause of a sinking or spongy pedal, this unit replaces it; diagnose the cause before replacing. Specs: 0.875 in bore, single reservoir, two outlets, two mounting holes, and an M12x1.0 secondary/rearward outlet thread. Country of origin: Taiwan.

Interchange: 100-4074 · 1004074 · 13-4495 · 134495 · 130.50053 · 13050053 · 355-21051 · 35521051 · 585102T200 · 585102G410 · R504495. Manufacturer part number M630869.