A simple experimental technique is developed that allows the pressures and stresses predicted by EHL analyses to be checked. A soft, tough steel disc is run, tinder controlled conditions, against a harder; smooth counterface. The pressures generated cause the soft disc to plastically deform. Once deformation ceases the residual profile may be measured and used as input to an EHL solver The calculated pressures are then used to determine the stress distributions as the rough surface passes through the conjunction. After allowing for the build up of residual stress the maximum von Mises' stress should be equal to the yield strength of the disc. This provides an accurate, quantitative check on the theoretical values.