Turn pedal effort into hydraulic brake pressure with the Dorman First Stop brake master cylinder, part number M39842, a direct-fit replacement for the 1990-1992 and 1996-1997 Toyota Corolla and the 1990-1992 Geo Prizm. Dorman designed this brake master cylinder to match the design, function and performance of the original unit on the listed applications. It is made from new, high-quality materials for a safe, durable replacement.
- Precise replacement: The aluminum cylinder housing is built to match the casting material of the original part for similar performance.
- Durable design: Every rubber component uses a high-quality EPDM compound that resists glycol-based brake fluid.
- 100% new: Made entirely from new materials for quality and safety.
- Strict specifications: Made to meet rigorous SAE International standards.
Specifications: Aluminum housing with a 0.813 in bore diameter and two outlets. The secondary and rearward outlet threads are M10 x 1.0, and the primary outlet thread pitch is 1 mm. The reservoir and sensor are included. Mounting hardware is not included. Country of origin: China.
A soft or sinking brake pedal, or fluid seeping at the unit, can be a sign of a worn master cylinder, though other brake faults can cause the same signs. Diagnose the brake system before replacing parts. If the original master cylinder is the cause, this brake master cylinder replaces it. Consult the vehicle service information for the correct mounting fasteners and whether the originals may be reused, and bleed the brake system after installation.
