I often ride with RoboPacers but tend to do a quick custom warm up- workout of 10min beforehand to get the legs ready. During the workout the brakes are disabled, which is fine. Then when I finish the warm up workout, I save and exit the workout and head to my chosen Robopacer to join the group. While I am riding with them, my brakes simply won’t work.
Has anyone else experienced this. I did a firmware update yesterday to be safe and today I still had the same problem.
If this is a workaround to disable braking i will use it every single time. 
I wonder if this was ever acknowledged as a bug, or intended behaviour.
I just did a short workout, then joined a RoboPacer immediately afterwards as part of the same activity. I noticed that my brakes weren’t working doing the free ride (Zwift Ride, but I presume the firmware is the same or very similar to the Play).
Whenever I pressed the brakes, I got the haptic buzz so they were being recognised.
I’d link it to this request too:
It makes sense to me that when not actually in erg mode, the brakes should work.