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Our Customers

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In response to the market need for better braking performance, Jacobs and Navistar worked together to develop a joint-branded engine that provides a new level of braking power. From design to production, Jacobs worked closely with Navistar to bring the new engine to market with remarkable swiftness.

The new MaxxForce® Engine Brake by Jacobs for the MaxxForce 11 and MaxxForce 13 diesel engines offers the highest engine braking horsepower per liter in the commercial trucking industry. This engine-mounted brake is available in the International® ProStar®+, TranStar® and WorkStar® trucks. Depending on application, the engine brake penetration levels exceed 80 percent.

Our Story

Although the Jacobs Engine Brake has been on the market since 1961, the need for it was terrifyingly demonstrated to its inventor Clessie L. Cummins, some thirty years earlier. In August of 1931, himself, Ford Moyer, and Dave Evans driving a Cummins diesel powered Indiana truck from New York to Los Angeles...

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Featured Technology


High Power Density (HPD)

The Jacobs’ Two-stroke Engine Brake for High Power Density Engines realizes up to 1.5 times the available braking performance of a conventional compression release engine brake.

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