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Dorman - First Stop Brake Master Cylinder P/N:M630797
$185.99
Convert brake-pedal force into the hydraulic pressure that operates your brakes with the Dorman - First Stop Brake Master Cylinder M630797. It's a direct-fit replacement for the listed classic International trucks, including the 1958 A110/A120/A130, 1959-1960 B110/B120/B130, 1966 1200A/1300A, and 1963-1964 C1200/C1300 — see the Buyer's Guide tab for all listed applications.
- 100% new: built entirely from new materials, not remanufactured.
- Cast-iron housing: constructed to match the casting material of the original part for similar performance.
- EPDM rubber components: made from a high-quality EPDM compound for resistance to glycol-based brake fluid.
- Key specs: 1.125 in bore, two outlets with a 1/2-20 rearward outlet size, and a single reservoir included. No sensor and no mounting hardware are included.
Precision-engineered to match the design, function, and performance of the original unit on the listed applications, it's made to meet rigorous SAE International standards. Country of origin: Taiwan.
Interchange: 100-4248 · 1004248 · 130.70007 · 355-71006 · 35571006 · 5461345 · 242768R91 · 261572C91 · 89410R91 · MC3573
Manufacturer part number M630797
This part cross-references / interchanges with the following part numbers:
100-4248, 130.70007, 355-71006, 5461345, 242768R91, 261572C91, 89410R91, MC3573
Frequently Asked Questions
What does this master cylinder do?
It converts brake-pedal force into hydraulic pressure that's sent to the brakes at each wheel, acting as the heart of the hydraulic braking system.
What vehicles does the M630797 fit?
It's a direct-fit replacement for a range of 1950-1968 International trucks, including the A/B/C-series, D1200/D1300, L150/L151, LM120, RM120, and 1200A/1300 models. Check the Buyer's Guide tab for the full list.
Does it come with a reservoir, sensor, or mounting hardware?
A single reservoir is included. A sensor is not included, and mounting hardware is not included; consult the vehicle service information for the correct fasteners and whether they may be reused.
What is this master cylinder made of?
The cylinder housing is cast iron, constructed to match the casting material of the original part, and all rubber components use an EPDM compound for resistance to glycol-based brake fluid.
What are signs my master cylinder may need replacing?
A sinking or spongy brake pedal, fluid leakage near the unit, or a pedal that slowly drops under steady pressure can be signs. Diagnose the cause first; if the master cylinder is at fault, this part replaces it.
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Dorman - First Stop Brake Master Cylinder P/N:M630797
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