Dorman M390250 Brake Master Cylinder

Reliable Brake Master Cylinder for Chevrolet Caprice and Impala

The Dorman M390250 brake master cylinder is designed to restore proper brake hydraulics in Chevrolet Caprice and Impala models. Featuring a durable aluminum construction and an included reservoir, this master cylinder ensures consistent brake fluid delivery for safe stopping performance.

• Master cylinder bore diameter: 1.25 inches for precise hydraulic pressure
• Constructed from aluminum for corrosion resistance and durability
• Includes reservoir for brake fluid storage
• Two outlet ports with rearward outlet size M11 x 1.5 and secondary outlet thread diameter M12 x 1.0
• Thread pitch of 1.0 for secure fitting

Product Details and Specifications

The Dorman M390250 brake master cylinder is engineered specifically for Chevrolet Caprice and Impala vehicles, providing a direct replacement for the original part. Its 1.25-inch bore diameter allows for accurate hydraulic pressure control, essential for effective brake system operation. Made from aluminum, this master cylinder offers resistance to corrosion and wear, extending the service life of your brake hydraulics. The included reservoir simplifies installation and maintenance by providing an integrated brake fluid container. With two outlets featuring precise thread sizes (M11 x 1.5 rearward outlet and M12 x 1.0 secondary outlet), this part ensures compatibility with the vehicle’s brake lines and fittings.

Common Applications and Problem Resolution

• Restores brake fluid pressure in Chevrolet Caprice and Impala brake systems
• Replaces leaking or damaged master cylinders causing brake fluid loss
• Addresses spongy or unresponsive brake pedal issues
• Solves brake system failure due to worn internal seals or bore damage
• Improves overall brake system reliability and safety

Installation Notes and Tips

When installing the Dorman M390250 brake master cylinder, ensure the brake fluid reservoir is properly filled and free of contaminants. Bleed the brake system thoroughly after installation to remove air and restore optimal hydraulic pressure. Verify that the outlet threads (M11 x 1.5 and M12 x 1.0) match the vehicle’s brake line fittings for a secure connection. This master cylinder does not include mounting hardware, so retain original fasteners or acquire appropriate replacements as needed.

Quality Assurance and Warranty

Dorman manufactures the M390250 brake master cylinder to meet or exceed OEM specifications for Chevrolet Caprice and Impala models. The aluminum construction and precise machining contribute to long-term durability and performance. While specific warranty details are not provided, Dorman products typically come with a limited warranty covering defects in materials and workmanship.