在车辆制动盘调整制动鼓与蹄片间隙的扁孔上有一橡胶堵。因体积小,维护车时常拆卸客易丢失。有人认为此孔无堵无非进一点尘土,没什么关系。笔者曾对同一车轴同时更换制动鼓与蹄片的车辆进行过一些测试,有无橡胶堵其蹄与 In the vehicle brake disc to adjust the brake drum and shoe clearance flat hole has a rubber plug. Due to small size, maintenance vehicles often easy to remove passengers off. Some people think that this hole without blocking nothing into the dust, it does not matter. I had on the same axle at the same time to replace the brake drum and shoe vehicle carried out some tests, with or without rubber blocking its hoof