citroen c5 1.6 hdi, 2009, esp/asr/abs warning light?

i have a problem with the braking system, every time i start braking and turning left, esp/asr/abs warning lights come on. i have had the alarms checked on a diagnostic unit but apart from storing the fault no code give, on further investigation via diagnostic unit looking at the abs ecu, it shows a braking force of 110bar, does anyone know why? or perhaps what the fault maybe? pressure sensor,abs ecu clutching at straws perhaps but please help