Abstract: A brake system for a vehicle is configured to mix a brake request signal corresponding to a level of a brake request with a variable frequency and a variable amplitude (e.g. torque tickle) when generating a signal for controlling a brake. The brake system comprises: one or more brakes configured to apply braking to one or more vehicle wheels; memory; and a processor configured to mix a brake request signal corresponding to a level of a brake request with a variable frequency and a variable amplitude to generate a signal for controlling the one or more brakes, wherein the variable frequency is retrieved from one or more predetermined frequencies stored in the memory, and the variable amplitude is calculated based on the level of the brake request.