Dorman M390291 Brake Master Cylinder

Reliable Brake Master Cylinder for Toyota Avalon and Camry

The Dorman M390291 Brake Master Cylinder is engineered to restore proper brake hydraulics for Toyota Avalon and Camry models. Designed with precision, this master cylinder ensures consistent brake fluid pressure and reliable stopping power.

• Master cylinder bore diameter: 1 inch for optimal fluid control
• Constructed from durable aluminum material for corrosion resistance
• Includes reservoir for brake fluid storage
• Equipped with a sensor to monitor brake system status
• Two outlets with rearward outlet size M10 x 1.0 and thread pitch 1.0
• Secondary outlet thread diameter of 10 mm
• Package contains the master cylinder only; mounting hardware not included

Product Details and Specifications

The Dorman M390291 brake master cylinder is designed specifically for Toyota Avalon and Camry vehicles, providing a precise fit and reliable performance. Its 1-inch bore diameter allows for effective brake fluid displacement, while the aluminum construction offers strength and resistance to corrosion. The included reservoir simplifies installation and maintenance by providing an integrated brake fluid container. Additionally, the built-in sensor helps monitor brake system conditions, enhancing safety and diagnostics. The master cylinder features two outlets, including a rearward outlet sized M10 x 1.0 with a 1.0 thread pitch, and a secondary outlet with a 10 mm thread diameter, ensuring compatibility with the vehicle’s brake lines.

Common Applications and Problem Resolution

• Restores brake fluid pressure for consistent braking response
• Replaces leaking or damaged master cylinders causing brake fluid loss
• Addresses brake pedal sinking or sponginess due to internal seal failure
• Resolves brake warning light activation related to sensor issues
• Improves overall brake system reliability in Toyota Avalon and Camry models

Installation Notes and Tips

Installation of the Dorman M390291 master cylinder requires careful attention to brake line connections and proper bleeding of the brake system to remove air. Since mounting hardware is not included, retain original hardware or source compatible fasteners. Verify thread sizes—M10 x 1.0 for the rearward outlet and 10 mm for the secondary outlet—to ensure proper fitment. It is recommended to inspect brake lines and related components during installation for any signs of wear or damage.

Quality Assurance and Warranty

Dorman manufactures the M390291 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction and integrated sensor contribute to long-term durability and reliable operation. This part is backed by Dorman’s limited warranty, providing coverage against defects in material and workmanship under normal use.