Abs & ebs problems

robB39:
Welcome to the board bazabs great to have a good techi to help us out.
I’ve had some trucks show an abs warning, then when you have braked above a certain speed the light goes out, but not until you’ve depressed the brake pedal is that normal.

no thats not normal but on some of the new trailer systems like the haldex eb+ system there are some strange faults that can appear if you lose power from the iso socket and the system is then powered by the back up power from the brake ights,
what abs system was on the trailer?