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Dorman - First Stop Brake Master Cylinder P/N:M39704
$222.99
Restore firm, dependable brake pedal feel to your classic Mercedes-Benz with the Dorman - First Stop Brake Master Cylinder M39704. It installs as a direct-fit replacement across a long list of 1984-1996 Mercedes-Benz models — including the 500SEC, 300SDL, 560SL, 420SEL, 300SE, 500SL, E420, S320 and SL500 — dropping in where the original master cylinder lived. A brake master cylinder converts the force from the brake pedal into the hydraulic pressure that actuates the vehicle's brake circuits; if a worn or leaking master cylinder is the cause of a sinking or spongy pedal, this unit replaces it.
- 100% new: made entirely of new materials, never remanufactured.
- Aluminum housing: built 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.
- Built to spec: precision-engineered to reproduce the original's design, function and performance, and made to meet rigorous SAE International standards.
The cylinder has 3 outlets, with an M10 x 1.0 rearward outlet thread. The fluid reservoir, mounting hardware and sensor are not included — transfer or replace these as directed by the service procedure, and consult the vehicle service information for the correct fasteners and whether they may be reused. Country of origin: Italy.
Interchange: 18M391 · 83-74005 · 8374005 · 83-74006 · 8374006 · M900598 · 100-1195 · 1001195 · M-11006 · M11006 · 072-8558 · 0728558 · 12296 · 13-2481 · 132481 · 11-2120 · 112120 · 11-2481 · 112481 · 130.35006 · 130.35014 · 131.35006 · MC251860 · 355-63005 · 35563005 · 355-63013 · 35563013 · M52481 · NM52481 · 0044303801 · 0044307501 · MC39704 · F119347 · F141797 · MC119347 · MC141797. Manufacturer part number M39704.
This part cross-references / interchanges with the following part numbers:
18M391, 83-74005, 83-74006, M900598, 100-1195, M-11006, 072-8558, 12296, 13-2481, 11-2120, 11-2481, 130.35006, 130.35014, 131.35006, MC251860, 355-63005, 355-63013, M52481, NM52481, 0044303801, 0044307501, MC39704, F119347, F141797, MC119347
Frequently Asked Questions
What does this brake master cylinder do?
It converts the force from your brake pedal into the hydraulic pressure that actuates the vehicle's brake circuits. If a failed master cylinder is the cause of a sinking or spongy pedal, this M39704 replaces it.
Does it come with a reservoir or mounting hardware?
No. The fluid reservoir, mounting hardware and sensor are not included. Transfer or replace these components as directed by your vehicle's service procedure.
Is this unit new or remanufactured?
It is 100% new — made entirely of new materials and not remanufactured — and built to meet rigorous SAE International standards.
What vehicles does it fit?
It's a direct-fit replacement for many 1984-1996 Mercedes-Benz models, including the 300SE, 420SEL, 500SL, 560SEC, E420, S320 and SL500. See the Buyer's Guide tab for the full list.
What is it made of and what brake fluid is it compatible with?
The cylinder housing is aluminum, built to match the original's casting material, and all rubber components use a high-quality EPDM compound for resistance to glycol-based brake fluid.
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Dorman - First Stop Brake Master Cylinder P/N:M39704
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