1. Loss of the dust cap of the brake chamber causes foreign objects to adhere. <br>2. There are foreign matters such as scum in the brake cylinder screw thread, resulting in leakage after tightening
1. The dust cap of the brake air chamber is lost, causing foreign matters to attach.<br>2. Air leakage after fastening due to foreign matters such as dross in the parts coming from the thread of brake chamber<br>