A device and a method for adaptive activation of a brake system of a rail vehicle are provided, wherein the brake system is controlled according to a predetermined first and second slip parameter range, wherein the first slip parameter range is a macro slip range with a higher permissible slip range, and the second slip parameter range is a micro slip range with a lower permissible slip range, and wherein a maximally available brake force in the micro slip range and an average brake force of the brake system achieved in the current slip range are determined.