Dorman M390134 Brake Master Cylinder

Reliable Brake Master Cylinder for Lexus GS300, SC300, SC400

The Dorman M390134 brake master cylinder is engineered to restore proper brake hydraulics in select Lexus models. Designed with precision, this aluminum master cylinder includes a reservoir and sensor to ensure consistent brake performance for your GS300, SC300, or SC400.

• Master cylinder bore diameter: 1.063 inches for accurate hydraulic pressure
• Durable aluminum construction for corrosion resistance and longevity
• Includes reservoir and sensor for integrated brake system monitoring
• Two outlet ports with rearward outlet size M10 x 1.0 and thread pitch 1.0
• Compatible with Lexus GS300, SC300, and SC400 models

Product Details and Specifications

The Dorman M390134 brake master cylinder is crafted from aluminum, providing a lightweight yet durable component essential for brake hydraulics. It features a 1.063-inch bore diameter, which is critical for maintaining proper brake fluid pressure and pedal feel. This master cylinder comes with an integrated reservoir and sensor, allowing for seamless fluid level monitoring and brake system diagnostics. The unit includes two outlets, with a secondary outlet thread diameter of 10 mm and a rearward outlet size of M10 x 1.0, ensuring compatibility with the brake lines on Lexus GS300, SC300, and SC400 vehicles. Note that mounting hardware is not included with this part.

Common Applications and Problem Resolution

• Restores brake fluid pressure in Lexus GS300, SC300, and SC400 brake systems
• Replaces master cylinders with worn or damaged bores causing brake pedal issues
• Addresses brake fluid leaks from the master cylinder reservoir or outlets
• Resolves brake warning light activation due to faulty sensor or fluid level detection
• Improves brake system reliability and pedal response in affected Lexus models

Installation Notes and Tips

When installing the Dorman M390134 brake master cylinder, ensure the brake system is properly bled to remove air and maintain hydraulic integrity. Verify that the reservoir is filled with the correct brake fluid type recommended for your Lexus GS300, SC300, or SC400. Since mounting hardware is not included, retain or replace existing hardware as needed. Confirm all outlet connections are secure and free of leaks before completing installation.

Quality Assurance and Warranty Information

Dorman manufactures the M390134 brake master cylinder to meet or exceed OEM specifications for fit, form, and function. The aluminum construction and integrated sensor contribute to reliable brake system performance. This part is backed by Dorman's standard warranty coverage, providing assurance of quality and durability for your Lexus GS300, SC300, or SC400 brake system repair.