Dorman 904-856 Vacuum Pump

Dorman 904-856 Vacuum Pump

Dorman 904-856 is an electric vacuum pump built to match the fit and function of the original equipment unit. It uses durable metal housing and an electric motor drive to support vacuum-operated vehicle functions on a wide range of Chrysler, Dodge, Jeep, Buick, Cadillac, Chevrolet, Ram, Saturn, and Volvo applications.

Key Features

• Electric vacuum pump with a 2-terminal blade connection and female rectangular connector
• Metal housing for durable service in demanding underhood conditions
• Diaphragm included with a 1.4-inch diaphragm diameter
• 2-port design with barbed vacuum pump connector
• OE-style replacement for vehicles that use vacuum-assisted systems
• Part number 904-856 for direct catalog identification

Detailed Description

This Dorman vacuum pump is engineered as a direct replacement for the original equipment pump, with the same basic fit and function needed to maintain vacuum supply for vehicle systems that rely on it. The electric motor drive, metal housing, and diaphragm construction are selected for reliable operation in everyday service. It is a practical replacement choice for applications such as the Dodge Challenger, Dodge Charger, Chrysler 300, Jeep Wrangler, and Volvo XC90, where consistent vacuum performance is important. Cross-reference part numbers include Standard Ignition AIP30 and 4581586AA for the same application.

What It Helps Address

• Loss of vacuum supply to vehicle-operated components
• Vacuum-related warning lights or drivability concerns
• Reduced operation of systems that depend on stable vacuum pressure
• Failure caused by wear in the original pump assembly
• Replacement needs on high-mileage Chrysler, Dodge, Jeep, and Volvo vehicles

Installation Notes and Tips

• Verify the inlet and outlet port sizes before installation: 0.38 in inlet and 0.23 in outlet
• Confirm the connector shape, terminal type, and terminal count match the original unit
• This application is listed without a bracket, so compare the mounting arrangement on the vehicle before service
• Inspect vacuum lines and electrical connections for damage before installing the replacement pump
• Use the vehicle-specific service procedure for removal and electrical testing

Quality Assurance

Dorman builds this replacement vacuum pump to match OE fit and function using durable materials for dependable service. Part number 904-856 is cataloged for broad fitment across 1999-2022 applications, including 2014-2022 Dodge Challenger, 2016-2022 Dodge Charger, 2015-2021 Chrysler 300, 2012-2019 Jeep Wrangler, and 2001-2009 Volvo S60.