Dorman 904-839 Vacuum Pump

Overview of Dorman Vacuum Pump 904-839 for Mercedes-Benz

The Dorman 904-839 vacuum pump is designed specifically for select Mercedes-Benz models including the GL350, GLE350, GLE350d, and ML350. Engineered with an aluminum housing and equipped with a relief valve, this vacuum pump supports the emission control vacuum system to maintain optimal engine performance.

• Compatible with Mercedes-Benz GL350, GLE350, GLE350d, and ML350 models
• Durable aluminum housing for lightweight strength
• Includes gasket for secure sealing
• Equipped with a relief valve for pressure regulation
• Belt-driven vacuum pump with barbed connector
• Inside diameter of 0.325 inches for inlet and connector
• Package contains one pump assembly and one gasket
• No pulley or mounting hardware included

Detailed Product Description

The Dorman 904-839 vacuum pump is a belt-driven component designed to integrate seamlessly with the vacuum system of Mercedes-Benz GL350, GLE350, GLE350d, and ML350 vehicles. Its aluminum housing provides a balance of durability and reduced weight, contributing to efficient engine operation. The included gasket ensures a tight seal to prevent vacuum leaks, while the built-in relief valve helps maintain proper pressure levels within the system. The vacuum pump features a barbed connector and an inlet with an inside diameter of 0.325 inches, matching OEM specifications for reliable fitment and function.

Common Applications and Issues Addressed

• Restores vacuum pressure for brake boosters and emission control systems
• Replaces faulty or worn vacuum pumps causing engine performance issues
• Eliminates vacuum leaks that can trigger check engine lights
• Supports proper operation of diesel engine components in GLE350d models
• Prevents loss of vacuum that affects power brake assist

Installation Notes and Tips

• Ensure compatibility with Mercedes-Benz GL350, GLE350, GLE350d, or ML350 before installation
• Use the included gasket to prevent vacuum leaks during installation
• Check belt condition and tension as the pump is belt-driven
• Note that pulley and mounting hardware are not included and may need to be reused or sourced separately
• Follow manufacturer torque specifications for mounting bolts

Quality Assurance and Warranty

Dorman vacuum pumps are manufactured to meet or exceed OEM standards for fit, form, and function. The 904-839 part is constructed with quality materials such as aluminum housing and includes a relief valve to ensure reliable operation. This part comes with a limited warranty covering defects in material and workmanship, providing confidence in its durability and performance for Mercedes-Benz GL350, GLE350, GLE350d, and ML350 vehicles.