The role of the brake vacuum tube is to drive the push rod forward, so as to play a role in helping. There are two kinds of brake vacuum tubes, one is used for brake booster pump, one is used for distributor ignition advance device, their role is to provide vacuum degree to one side of the working pump film, and the other side is communicated with the atmosphere
The hose is U-shaped or arched in the pump chamber; Two or more sliders (sliders) are fixed on the runner (swivel arm) to compress the hose in a sliding manner. The runner compresses the hose two or more times per rotation (depending on the number of sliders). Because of the friction heat, in order to ensure normal operation, about half of the pump chamber is filled with lubricant, on the one hand, in order to reduce the friction coefficient, and more importantly, in order to transfer the generated friction heat to the pump body and discharge the pump to ensure the normal operation of the pump.
