Electro-hydraulic thruster brakes from Global Electric Tools? Perfect! Choose one to operate in seaport cranes, steelworks and other material handling applications. Ideal for high-pressure.Electro hydraulic thruster (commonly called thruster) drum brake is a device used to retard the speed of moving machinery and to stop it accurately to the desired position. When the braking force is applied to the brake shoes by a pre-stressed compression spring, the shoes press on the rotating brake drum retarding its speed and finally stopping it. The releasing of the brake drum and compressing of the spring is done by the thruster.