Dorman M630870 Brake Master Cylinder

Reliable Brake Master Cylinder for Lexus LS400

The Dorman M630870 brake master cylinder is engineered to restore proper brake hydraulics for your Lexus LS400. Designed with durable cast iron construction, this master cylinder ensures consistent braking performance and long-lasting reliability.

• Compatible with Lexus LS400 models
• Constructed from durable cast iron material
• Features a 1-inch master cylinder bore diameter
• Includes master cylinder and bleeder kit for maintenance
• Equipped with two outlets and a removable reservoir
• Rearward outlet size: M10 x 1.0 thread diameter
• Three mounting holes for secure installation

Product Details and Specifications

The Dorman M630870 brake master cylinder is designed specifically for the Lexus LS400, providing a precise fit and reliable function. Its cast iron body offers strength and resistance to wear, while the 1-inch bore diameter supports effective hydraulic pressure for braking. This master cylinder includes two outlets, with the secondary outlet thread diameter measuring 0.5 inches and the rearward outlet sized at M10 x 1.0, allowing compatibility with the vehicle’s brake lines. The removable reservoir type facilitates easy maintenance and fluid replacement. Note that this product does not include mounting hardware, brake booster, push rod, bleeder hoses, sensor, or mounting bracket, so these components must be sourced separately if needed.

Common Applications and Problem Resolution

• Restores brake hydraulic pressure in Lexus LS400 vehicles
• Replaces worn or leaking master cylinders causing brake fluid loss
• Addresses spongy or unresponsive brake pedal issues
• Solves brake system failure due to internal cylinder wear
• Improves overall brake system reliability and safety

Installation Notes and Tips

When installing the Dorman M630870 brake master cylinder, ensure the brake system is properly bled using the included bleeder kit to remove air and maintain hydraulic integrity. Verify the three mounting holes align correctly with the vehicle’s mounting points. Since mounting hardware is not included, use the original or compatible fasteners. Confirm all brake line connections match the specified outlet thread sizes (0.5 inch secondary outlet and M10 x 1.0 rearward outlet) to prevent leaks. Always follow manufacturer torque specifications and safety procedures during installation.

Quality Assurance and Warranty

Dorman manufactures the M630870 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The cast iron construction ensures durability under demanding conditions. This part is backed by Dorman’s limited warranty, providing coverage against defects in materials and workmanship for a specified period. Refer to Dorman’s warranty documentation for detailed terms and conditions.