随着国民经济的迅速发展,城乡物质、文化交流日益频繁,短途及长途客、货运输量猛增,因此有关法规和机动车检验规范,对客、货车的制动系统提出了许多新要求。除制动性能提高、检验范围扩大及项目增多外,还规定新设计车辆的制动系统必须采用双管路, With the rapid development of the national economy, material and cultural exchanges between urban and rural areas are becoming more frequent and short-haul and long-haul passengers and cargo surges so that the relevant regulations and motor vehicle inspection standards have put forward many new requirements on braking systems for passenger and freight cars. In addition to improving braking performance, testing scope and project expansion, it is also required that the newly designed vehicle braking system must be double-pipe,