Two demarcated methods comparison of automobile brake test device

the two demarcated methods of automobile brake test device have been compared,weight pressures it directly and using instruments pull the roller upward.Through the experiment we can get the conclusion that the experimental data is nearly same;moreover,by comparing the advantages and weaknesses of the two methods in practical application,we can obtain a result that using instruments pull the roller upward is more accurate.So synthesize the whole demarcated process,in order to get more accurate measure result,come up with the method of using instruments pull the roller upward.