What is another name for an auxiliary braking system that limits or removes compression from the pistons?

The term commonly used to refer to an auxiliary braking system that limits or removes compression from the pistons is "Jake Brake." This system specifically utilizes the engine's exhaust valves to enhance braking effectiveness by releasing compressed air from the cylinders at the end of the power stroke, which reduces speed without relying solely on the vehicle's friction brakes.

This braking method is especially useful in heavy vehicles, as it allows for better control and reduced wear on the traditional braking system, preventing brake fade during extended downhill driving.

While "Engine Brake" and "Compression Brake" are often used interchangeably with "Jake Brake," the latter is the trademarked name of a specific product developed by Jacobs Vehicle Systems. "Power Brake" refers to a different system related to enhancing brake pedal feel, rather than an auxiliary braking method that utilizes the engine's properties for deceleration.