Thx Pete,
I put the 737 on the runway, started logging per your instructions, put autobrakes to RTO and back and stopped logging, just a couple of seconds. But the log file (585kb) consists of hundreds of lines like
118608 *** EVENT: Cntrl= 70092 (0x000111cc), Param= 4194304 (0x00400000) <70092>
and then somewhere in between:
118670 *** EVENT: Cntrl= 65588 (0x00010034), Param= 0 (0x00000000) BRAKES
While "70092" is related to the autobrake, "65588" seems to be the control for applying brakes. A quick internet search for these numbers led to a thread from 2013 here in this forum with similar symptoms. The OP had his Brake axis assigned as normal FS axis - and BINGO: changing my assignment to "direct" solved the issue. No idea why I had it assigned it like that as I usually have it calibrated. Anyway - problem solved, thank you
Tom