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Dorman - First Stop Brake Master Cylinder P/N:M39712
$92.99
Convert brake-pedal effort into the hydraulic pressure that operates the braking system with the Dorman - First Stop Brake Master Cylinder M39712. Precision-engineered to match the design, function, and performance of the original unit, it installs as a direct-fit replacement for 1979-1980 Dodge W200 and W300, 1981-1993 Dodge W250 and W350, 1984-1993 Dodge D350, and 1986-1993 Dodge D250 (all engines).
- 100% new: built entirely from new materials — not remanufactured — and made to meet rigorous SAE International standards.
- Cast iron housing: 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.
- Ready to install: two-outlet design with a 1.125 in bore and a 1/2-20 rearward outlet size; the reservoir is included. No sensor or mounting hardware is included — consult the vehicle service information for the correct fasteners and whether they may be reused.
Made in China.
Interchange: 18M396 · 783-40006 · 78340006 · 83-40006 · 8340006 · M900603 · 100-2659 · 1002659 · M-87006 · M87006 · 11775 · 13-1775 · 131775 · 10-1775 · 101775 · 130.67006 · 131.67006 · 4112654 · MC98896 · 355-40052 · 35540052 · 98896 · 98896A · M1775 · NM1775 · 2539712 · MC39712 · F98896. Manufacturer part number M39712.
This part cross-references / interchanges with the following part numbers:
18M396, 783-40006, 83-40006, M900603, 100-2659, M-87006, 11775, 13-1775, 10-1775, 130.67006, 131.67006, 4112654, MC98896, 355-40052, 98896, 98896A, M1775, NM1775, 2539712, MC39712, F98896
Frequently Asked Questions
What does this master cylinder do?
It converts the force from the brake pedal into hydraulic pressure and distributes it through its two outlets to operate the vehicle's braking system.
What's included in the box?
The package contains the master cylinder with its reservoir. No sensor and no mounting hardware are included; consult the vehicle service information for the correct fasteners.
Which vehicles does the M39712 fit?
It's a direct-fit replacement for 1979-1980 Dodge W200/W300, 1981-1993 W250/W350, 1984-1993 D350, and 1986-1993 D250 (all engines). See the Buyer's Guide tab.
What is it made of, and what's the bore size?
The housing is cast iron, built to match the original's casting material, with a 1.125 in bore, two outlets, and a 1/2-20 rearward outlet. Rubber parts use an EPDM compound.
What are signs the master cylinder may need replacing?
A slowly sinking or spongy brake pedal or brake-fluid leaks can be signs. Diagnose the cause first; if the master cylinder is at fault, this replaces it.
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Dorman
Dorman - First Stop Brake Master Cylinder P/N:M39712
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