Braiding is a highly automated manufacturing technology for endless fibre reinforced composites, which are used for industrial applications with high requirements. The braiding process requires a complex tool concept and movement, which both significantly influence fibre paths and braiding angles and later on the final local fibre orientation and fibre volume fraction in the composite. This has in turn a pronounced impact on the resulting composite stiffness and strength. Besides the controllable process parameters, coefficients of friction and chosen fibre material can further affect the braiding angle. Within this paper, a modelling strategy for a braiding process is developed in order to investigate the effect of friction and mandrel geometry on the resulting braiding angle. Simulations both with a circular and a rectangular mandrel cross section and different friction coefficients between threads and tools are carried out. For a circular cross section, the results show no significant effect of friction, neither among threads themselves nor between threads and mandrel, on the braiding angle. On the mandrel with rectangular cross section, on the other hand, the coefficients of friction are strongly correlated with changes of the local braiding angle along plane areas and reduce rearrangements in the transitional areas.