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While braking cars as well as trucks, a large amount of energy is taken into the brake system in a short period of time. This leads to some problems e.g. cracking of the disc, non-uniform wear of pad and disc. The paper describes methodes to analyze the cracking problem of the disc. It is pointed out, how the pressure distribution between pad and disc can be measured before and after a special test procedure. With FEM-modelling the distribution of normal and friciton forces in the contact zone between pad and disc is calculated. The measurements and the calculations describe a pathway to simulate some reasons and remedys for the solution of the problem.