The Brake And Jumper Fluid acts as a hydraulic agentâmore on this below. It is also formulated to protect the metal brake components from corrosion and moisture. This is achieved by adding various additives, although some brake fluids come pre-mixed. Brake fluid is a type of hydraulic fluid used in hydraulic brake and hydraulic clutch applications in vehicles. It is responsible for transferring force into pressure, and to amplify braking force. These are offered in various types depending on the need and demand of the people. The Brake And Jumper Fluid is very effective and made for efficient use.