Dorman - First Stop Brake Master Cylinder M630939

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Dorman - First Stop Brake Master Cylinder P/N:M630939

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$172.99

MPN: M630939

UPC: 885484897816

Item Package Quantity: 1

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Dorman - First Stop Brake Master Cylinder P/N:M630939

$172.99

Description

Convert brake-pedal force into the hydraulic pressure that operates the wheel brakes with the Dorman - First Stop Brake Master Cylinder M630939. It's engineered to match the original master cylinder's design and function and drops in as a direct-fit replacement for the 2015-2019 Hyundai Sonata [All] and the 2016-2019 Kia Optima [All].

Cast-iron housing: the cylinder housing is built to match the casting material of the original part for similar performance.
EPDM rubber components: all rubber parts use a high-quality EPDM compound for resistance to glycol-based brake fluid.
100% new: made entirely of new materials, not remanufactured.
Strict specifications: made to meet rigorous SAE International standards.

This unit has a 0.875 in bore and two outlets threaded M12 x 1.0 (1 mm pitch), and it includes a single reservoir and a fluid-level sensor. Mounting hardware is not included — consult the vehicle service information for the correct fasteners and whether they may be reused. Signs the master cylinder may need replacing include a sinking or spongy brake pedal, gradual loss of pedal, or external brake-fluid leakage; diagnose the cause before replacing. Country of origin: China.

Interchange: 130.51072 · 355-03066 · 35503066 · 58510C1200 · NM55638 · MC391490. Manufacturer part number M630939.

Manufacturer's Description

Product Specs

Buyer's Guide

Interchange Part Numbers

This part cross-references / interchanges with the following part numbers:

130.51072, 355-03066, 58510C1200, NM55638, MC391490

Frequently Asked Questions

What vehicles does this master cylinder fit?

It's a direct-fit replacement for the 2015-2019 Hyundai Sonata [All] and the 2016-2019 Kia Optima [All]. Check the Buyer's Guide tab to confirm your exact vehicle.

What does a brake master cylinder do?

It converts brake-pedal force into hydraulic pressure and distributes that pressure through the brake circuits to operate the wheel brakes.

Does it include a reservoir and sensor?

Yes — it includes a single reservoir and a fluid-level sensor. Mounting hardware is not included; consult the vehicle service information for the correct fasteners.

What are signs my master cylinder may need replacing?

A sinking or spongy brake pedal, gradual loss of pedal, external brake-fluid leakage, or an illuminated brake warning light. Diagnose the cause before replacing.

What are its key specifications?

Cast-iron housing, 0.875 in bore, and two outlets threaded M12 x 1.0 (1 mm pitch). It is 100% new, not remanufactured, and made to SAE International standards. Country of origin: China.