Dorman 904-861 Vacuum Pump

Dorman 904-861 Vacuum Pump for GM V8 Applications

Dorman 904-861 is a mechanical vacuum pump built to match the fit and function of the original equipment unit. It uses a belt drive, cast aluminum housing, and barbed vacuum connections to support vacuum-operated vehicle functions on select Cadillac, Chevrolet, and GMC models.

Key Features

• Mechanical vacuum pump with belt drive
• Cast aluminum housing for durable service
• Includes pulley, gasket or seal, and mounting hardware
• Barbed connector with one vacuum port
• Direct replacement for OE-style fit and function
• Part number 904-861

Detailed Description

This vacuum pump is built for vehicles that rely on a mechanically driven vacuum source. It matches the original equipment pump’s fit and function and is engineered for steady operation of vacuum-operated vehicle systems. The design includes a pulley, gasket or seal, and mounting hardware, along with a cast aluminum housing for dependable installation and service. Dorman 904-861 is a practical replacement for GM truck and SUV applications where the factory pump has worn out or failed.

Compatible With 2015-2019 Cadillac Escalade, mechanically driven vacuum pump; 2015-2019 Chevrolet Silverado 1500, mechanically driven vacuum pump; and 2015-2019 GMC Sierra 1500, mechanically driven vacuum pump. Additional coverage includes 2020 Cadillac Escalade, 2020 Chevrolet Tahoe, and 2020 GMC Yukon applications. This part cross-references GM OE 12654013 for the same application.

What It Helps Address

• Loss of vacuum supply from a worn mechanical pump
• Reduced operation of vacuum-dependent vehicle functions
• Noise or performance issues from a failing belt-driven pump
• Leaks at the pump mounting or vacuum connection points
• Replacement needs after OE pump wear on GM trucks and SUVs

Installation Notes and Tips

Verify inlet and outlet port sizes, pulley alignment, and belt-drive routing before installation. Replace the gasket or seal during service and confirm the vacuum line connection is secure at the barbed fitting. This pump is intended for mechanically driven applications, so confirm vehicle build details against the fitment list for Cadillac Escalade, Chevrolet Silverado 1500, Chevrolet Tahoe, GMC Sierra 1500, and GMC Yukon models.

Quality Assurance

Dorman manufactures this replacement pump to match OE fit and function using durable materials for reliable service. The design supports consistent operation in vacuum-driven systems on the listed GM applications.