Hello, in most of my cases i had too change the valve block for the brake, part nr; 51415620.
It is wery hard too diagnose, when the brake is applied, sistem doesent get all the information in 1000ms, trigers the fault, than when you switch the machine off an on again, it is normal , until you step of the machine, and the brake is aplayed again.
Maybe these helpt.

As others have posted there are microswitches on motors that check brake response. They are replacable and adjustable. If your brake is old you may have to change brake coil or adjust microswitch.

check the left motor brake, it could be micros.

hello, everything about the brake is fine, help with the control please

if everything is in order with the brake, then the controller is to blame, you can contact me and help with the repair of the controller. This is a very common problem.

check bremse on left side , connection or feedback switch on brake