ecm replacement now no engine brakes

[volvokid]

Good evening everyone...IVE Ran into a bit of issue just now. My ecm was causing my truck to shutoff so i decided to get it replaced. I followed the instructions on pulling my file from the old ecm and to add it to the new ecm.. My issue is everything seems to be running and working fine.. No cel... But when i took it for a test drive the engine brakes no longer work... I mean they dont work at all!!! So if anyone has a idea or been in this situation before colud you please give me some help to figure this out please thanks again!!!!