I tried it just now and it worked fine for me. It took a while until the brakes were charged but it worked just fine. Before you depart you also need to get off the seat and release the parking brake at the back wall. Maybe give it another try, could be that it just was a temporary bug?
Strange, I got it to work this time. I've been trying for a couple of days on this scenario though and been waiting 10+ minutes for the brakes. Thank you anyway though.