I'm probably missing something really basic, but...1. If the other 4 axes are working, K3 would seem to be working.
2. If the manual brake release works, the internal wiring would seem to be OK.I don't have a schematic readily available (it's on page 455/572 in the M98A IRB2400 Product Manual Skooter posted), but you might continuity test the brake leads from the motor to the cabinet side of the motor cable. (First, I'd disconnect and re-connect both ends of the motor cable.)
Thank you for cooperation Iowan,
We solved problem with changing K3 contactor.(İt seems good but not)