The BMW M3 and BMW M4 both feature a new type of brake system. Let us begin with the M compound brakes – what is special about them and in what ways do they differ from the M compound brakes installed in the previous model?
Klaus Dullinger: M compound brakes have a grey-cast friction ring in a floating arrangement that is connected by pins to the aluminium brake cover. The pin assembly means that as the temperature increases, it is able to expand freely in a radial direction and subsequently cool down again without any residual deformation. This connecting system has been in used since the second generation of the BMW M3.