The main objective of this research study is to present the results of the influence of tire pressure, from a truck front suspension, on the vertical dynamic load applied on the pavement. For the measurements, it has been used a durability test track located in Brazil. The tire pressure was increased by 10 psi from 90 to 130 psi with a constant load of 6 tons on the front suspension, the maximum allowed load for front axle, according to Brazilian legislation. By applying relative damage concept, it is possible to conclude that the variation on the tire pressure will not affect significantly the load applied on the pavement. Although, it is recommended to repeat the same methodology, in order to analyse the influence on the variation of the other quarter car model variants.

damage; vertical dynamic load; tire