Recently, the automotive part manufacturers have made a lot of efforts to increase the reliability of their products for various reasons. For that reason, many manufacturers have tried to get the automatic inspection system for their products. The automatic system can reduce the number of the workers and increase the accuracy of the inspection. In this study, inspection subject is brake-hose resonator. This component is made through a high frequency bonding process and can have the possibility of a defect like a leak problem. The purpose of this study is to make the automatic inspection system for detecting the implied leak problem of the products with the vision system. Consequently, this study show that the vision system is a very reasonable method to detect the leak problem. The automatic inspection system can decrease the detection time from 35s/EA to 22s/EA in case of continuous operation.