Brake pedal “knärzt” and vibrates..

Good morning, your moose.. My black guy is again teasing.. This morning while driving off (turning) my brake pedal started to creak when it’s easy to act.. Sounds like you didn’t get the gear properly when switching.. So to speak a “beautiful greeting from the gearbox” sound.. Just not quite as loud.. There are also clearly vibrations in the brake pedal, synchronous to the noise.. With stronger braking it’s not.. What can that be..? Does anyone know that..? a thank you and happy Easter days.. Stephan