ABS and brake assist warning light and message
 

My car 07 XC70; ABS and brake assist light and message need service on; Where should I check for the problems? Please help!

You have to start with an appropriate scan tool.

I had the same issue, out of nowhere. There was nothing wrong with the brakes so far as I (or my local volvo tech) could tell. I used the OBD2 scanner I purchased on amazon to clear the code to see if it would come back. Hasn't yet. There is a very specific scanner that you need for our (mine is an 04) xc70s. I can give you a link if interested.

Thanks Matthew, please give me the link; The message would came on while driving, but after stop and engine turned off, when start and drive again the message dissapeared, it's drive me nut.