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Dorman - First Stop Brake Master Cylinder P/N:M39779
$82.99
Turn brake-pedal pressure into the hydraulic force that operates the brake circuits with the Dorman - First Stop Brake Master Cylinder M39779. It drops in as a direct-fit replacement for the 1988-1989 Honda Accord [All] and 1988-1991 Honda Prelude [All], built to mirror the design, function, and performance of the original master cylinder on those listed applications.
- 100% new: made entirely of new materials, not remanufactured, for consistent quality and safety.
- Aluminum housing: constructed to match the casting material of the original part for similar performance.
- Durable rubber: all rubber components use a high-quality EPDM compound for resistance to glycol-based brake fluid.
- Engineered to spec: made to meet rigorous SAE International standards.
The unit has a 0.938 in bore diameter and two outlets, with the secondary/rearward outlet threaded M10 x 1.0 (1 mm primary outlet thread pitch). It includes the reservoir and the fluid-level sensor. Mounting hardware is not included — consult the vehicle service information for the correct fasteners and whether they may be reused. Country of origin: Taiwan.
Signs the original may need replacing include a sinking or spongy pedal, gradual loss of braking pressure, or brake fluid seepage at the cylinder. Diagnose the cause first; if a failed master cylinder is confirmed, this replaces it.
Manufacturer part number: M39779.
Frequently Asked Questions
What does this master cylinder do?
It converts brake-pedal force into hydraulic pressure that is distributed through its two outlets to actuate the vehicle's brake circuits.
What vehicles does it fit?
It's a direct-fit replacement for the 1988-1989 Honda Accord [All] and the 1988-1991 Honda Prelude [All]. Check the Buyer's Guide tab to confirm your vehicle.
Does it include a reservoir and sensor?
Yes. The reservoir and the fluid-level sensor are included; the package contents are the master cylinder.
Is mounting hardware included?
No. Mounting hardware is not included — consult the vehicle service information for the correct fasteners and whether they may be reused.
What are signs it may need replacing?
A sinking or spongy brake pedal, gradual loss of braking pressure, or fluid seepage at the cylinder may indicate a failed master cylinder. Diagnose the cause before replacing.
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Dorman - First Stop Brake Master Cylinder P/N:M39779
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