Dorman M39423 Brake Master Cylinder

Reliable Brake Master Cylinder for Toyota Corolla

The Dorman M39423 brake master cylinder is engineered to restore proper brake hydraulics for Toyota Corolla models. Designed with durable cast iron and an included reservoir, this master cylinder ensures consistent brake fluid pressure and reliable stopping power.

• Master cylinder bore diameter: 0.813 inches for precise hydraulic control
• Constructed from cast iron for strength and durability
• Includes reservoir for brake fluid storage
• Two outlets with rearward outlet size M10 x 1.0 and 10mm secondary outlet thread diameter
• Thread pitch of 1.0 for secure fitting
• Package contains the master cylinder only; mounting hardware not included

Product Details and Specifications

The Dorman M39423 brake master cylinder is specifically designed for Toyota Corolla vehicles, providing a direct replacement for the original part. Its 0.813-inch bore diameter allows for accurate brake fluid displacement, essential for maintaining proper brake pedal feel and stopping performance. The cast iron construction offers resistance to wear and corrosion, extending the service life of the component. This master cylinder includes a reservoir to hold brake fluid, eliminating the need for a separate purchase. It features two outlets with a rearward outlet size of M10 x 1.0 and a secondary outlet thread diameter of 10mm, both with a thread pitch of 1.0, ensuring compatibility with the vehicle's brake lines.

Common Applications and Problem Resolution

• Restores brake fluid pressure in Toyota Corolla brake systems
• Replaces leaking or damaged master cylinders causing brake fluid loss
• Fixes spongy or unresponsive brake pedal issues
• Addresses brake failure symptoms due to internal cylinder wear
• Resolves contamination or corrosion-related brake hydraulic problems

Installation Notes and Tips

Installation of the Dorman M39423 brake master cylinder requires proper brake system bleeding to remove air and ensure optimal brake performance. Since mounting hardware is not included, retain or source the necessary bolts and fittings from the original assembly or aftermarket suppliers. Verify thread sizes and pitch before installation to ensure compatibility with existing brake lines. It is recommended to inspect related brake components during installation for wear or damage.

Quality Assurance and Warranty

Dorman manufactures the M39423 brake master cylinder to meet or exceed OEM specifications for Toyota Corolla vehicles. The cast iron material and precise machining contribute to reliable performance and durability. While specific warranty details are not provided, Dorman products typically come with a limited warranty covering defects in material and workmanship. Consult product documentation or the manufacturer for exact warranty terms.