Detection device and pressure-holding device of chassis hydraulic brake pipeline

The utility model relates to a detection device of a chassis hydraulic brake pipeline, comprising an air source and a pressure-holding device. The pressure-holding device comprises a gas pipeline, wherein the gas pipeline is provided with a gas inlet connected with the air source and a gas outlet used for being connected with a brake pipeline to be detected; and the gas pipeline consists of, sequentially from the gas outlet to the gas inlet, a valve used for controlling on/off of the gas pipeline, a filtration and pressure-reducing device, and a two-position switching valve used for communicating the air source with the filtration and pressure-reducing device when in inflation and communicating the filtration and pressure-reducing device with the outside air when in deflation. The utility model further relates to a pressure-holding device. The detection device and the pressure-holding device in the utility model can be used to filter and dry the air from an air source of a factory, adjust the pressure of the