Is your brake pedal feeling soft or sinking? A failing master cylinder could be the culprit. This NAMCCO replacement part (MC390805) is designed to match the fit and function of original equipment, ensuring a proper installation. It's a direct swap for part numbers like M630282, 130.66047, F140375, and 18047524, but PLEASE double-check your vehicle's specific make, model, and year to confirm compatibility before buying – we don't want you to get the wrong part! This assembly is built to meet strict international safety and quality standards (SAE/JIS/CNS), so you can trust its performance. It comes with a strong 12-month warranty for peace of mind. Getting your brakes working correctly is crucial for safety, and this master cylinder is a reliable, high-quality choice for your repair job.