Dorman M630139 Brake Master Cylinder

Reliable Brake Master Cylinder for Lexus RX300

The Dorman M630139 brake master cylinder is engineered to restore proper brake hydraulics for your Lexus RX300. Designed with durable aluminum construction and precise specifications, this master cylinder ensures consistent brake performance and safety.

Key Features of Dorman M630139 Brake Master Cylinder

• Constructed from lightweight, corrosion-resistant aluminum
• Master cylinder bore diameter of 1 inch for accurate hydraulic pressure
• Two outlet ports with rearward outlet size M10 x 1.0 thread pitch
• Includes master cylinder only; reservoir and mounting hardware not included
• Compatible specifically with Lexus RX300 brake hydraulic systems

Detailed Product Description

The Dorman M630139 brake master cylinder is designed to meet the exact hydraulic requirements of the Lexus RX300. Featuring a 1-inch bore diameter, this aluminum master cylinder provides reliable pressure delivery to the brake system. It includes two outlets with a secondary outlet thread diameter of 10 mm and a rearward outlet size of M10 x 1.0, ensuring proper fitment and connection to brake lines. This part does not include a reservoir or mounting hardware, so those components must be sourced separately. The absence of a sensor means it is compatible with vehicles that do not require integrated brake fluid level monitoring.

Common Applications and Issues Addressed

• Restores brake hydraulic pressure for improved pedal feel
• Replaces worn or leaking master cylinders causing brake fluid loss
• Eliminates spongy or unresponsive brake pedal issues
• Addresses brake system failures related to internal cylinder wear
• Ensures proper brake fluid distribution to front and rear brakes

Installation Notes and Tips

• Verify compatibility with Lexus RX300 model year before installation
• Bleed brake system thoroughly after installation to remove air
• Use appropriate brake fluid as specified by vehicle manufacturer
• Inspect brake lines and fittings for damage during replacement
• Mounting hardware and reservoir must be reused or purchased separately

Quality Assurance and Warranty Information

Dorman manufactures the M630139 brake master cylinder to meet or exceed OEM standards for fit and function. The aluminum construction provides corrosion resistance and durability under normal operating conditions. While mounting hardware and reservoir are not included, the master cylinder itself is backed by Dorman's quality control processes. Please consult Dorman's warranty policy for specific coverage details.