Abstract
Whilst in the past, the working of brakes was studied by means of measuring instruments fitted in the vehicle, to-day one makes an almost exclusive use of braketesters, of which exist two types: platform testers and roller testers. When studying the braking of empty or half- loaded vehicles, involved calculation is necessary in order to judge the braking performance of the completely loaded vehicle. Until now, the measuring instruments for testing shock-absorbers could only test them unmounted. As this method is inapplicable in ordinary inspection work, a measuring instrument is being developed which will allow the testing of shock-absorbers, while leaving them mounted on the vehicle.