Turn pedal effort into the hydraulic pressure your brakes rely on with the Dorman First Stop Brake Master Cylinder, part number M39780, a direct-fit replacement for the 1988-1995 Honda Civic, 1993-1997 Honda Civic Del Sol and 1988-1991 Honda CRX (all engines). Dorman engineered this unit to mirror the original master cylinder's design, function and performance on the listed applications. It is built from new, high-quality materials for a safe, durable replacement.
- Precise replacement: the cylinder housing is constructed to match the casting material of the original part, intended to deliver similar performance.
- Durable design: every rubber component uses a high-quality EPDM compound that resists glycol-based brake fluid.
- 100% new: made entirely of new materials for quality and safety.
- Strict specifications: made to meet rigorous SAE International standards.
Specifications: aluminum master cylinder with a 0.813 in bore and two outlets. The secondary and rearward outlets are M10 x 1.0, and the primary outlet has a 1 mm thread pitch. The reservoir and sensor are included. Mounting hardware is not included, so consult the vehicle service information for the correct fasteners and whether the originals may be reused. Country of origin: China.
If you are replacing the brake master cylinder on a 1988-1995 Honda Civic, signs the unit may need replacing include a soft or sinking brake pedal, brake fluid seeping around the master cylinder, or a lit brake warning light. Other brake components can cause the same symptoms, so diagnose the cause before replacing parts. See the Buyer's Guide tab for full fitment details.
