Sorry for the last reply - i found it ! -
 

I have an hummer h2 - 2005 - 70,000 miles - just had the front bearings replaced - at the same time i now see a blue rubber line - above the disc's - i don't remember seeing this before ? What is it ? - is this new ?

could be your new wheel speed sensor wires.

When you post anything H2, it goes in the H2 section. Crazy, but that is how it works here. MOVED.

Thanks ! That must be it !