Dorman 904-842 Vacuum Pump

Overview of Dorman Vacuum Pump 904-842 for BMW M2, M3, M4

The Dorman 904-842 vacuum pump is designed specifically for BMW M2, M3, and M4 models, providing reliable vacuum pressure essential for emission control and brake system performance. This pump assembly includes a gasket and features an aluminum housing for durability and efficient heat dissipation.

• Compatible with BMW M2, M3, and M4 models
• Part number 904-842 for precise identification
• Aluminum housing material for lightweight strength
• Includes gasket for proper sealing
• Equipped with a relief valve for pressure regulation
• Belt-driven vacuum pump with barbed connector
• Inside diameter of 0.585 inches for inlet and connector
• No pulley or mounting hardware included

Detailed Product Description

The Dorman 904-842 vacuum pump is engineered to maintain consistent vacuum pressure in BMW M2, M3, and M4 vehicles. Its aluminum housing ensures a robust yet lightweight construction, which helps in heat dissipation and long-term durability. The pump operates via a belt drive system and features a barbed vacuum pump connector with an inside diameter of 0.585 inches, matching OEM specifications for seamless integration. A relief valve is incorporated to prevent over-pressurization, enhancing system safety. This pump assembly comes with a gasket to ensure a secure and leak-free installation, although mounting hardware and pulley are not included.

Common Applications and Issues Addressed

• Restores vacuum pressure for brake boosters to improve braking response
• Supports emission control systems by maintaining proper vacuum levels
• Replaces faulty or worn vacuum pumps causing engine performance issues
• Eliminates vacuum leaks that can trigger check engine lights
• Prevents vacuum-related malfunctions in BMW M2, M3, and M4 models

Installation Notes and Tips

• Ensure compatibility with BMW M2, M3, or M4 before installation
• Use the included gasket to prevent vacuum leaks during assembly
• Verify belt condition and tension on the drive system for optimal pump operation
• Note that pulley and mounting hardware are not included and may need to be reused or sourced separately
• Follow manufacturer torque specifications when securing the pump

Quality Assurance and Warranty

Dorman vacuum pumps are manufactured to meet or exceed OEM standards for fit, form, and function. The 904-842 part undergoes rigorous quality control to ensure reliable performance in BMW M2, M3, and M4 vehicles. This product includes a gasket to support proper sealing and is backed by Dorman's limited warranty, providing coverage against defects in materials and workmanship under normal use.