Wondering if anyone could help, my all road A6 C5 , when I drive it and rex past 2000rpm the abs light comes on with the esp and suspension level control light, if I turn car off and restart the light go out, if I keep under 2000 rpm no lifts come on, I have logged with vcds, and only fault is brake pressure implausible, when I do live reading it fluctuates between 0 to 33, when I put foot on brake the pressure goes up as it should, I have changed the abs unit and brake light switch. Is there another module or something I missed