Volvo: V70 2002 ABS light on, brake failure, valdo

Question
When I turn on AC after 15 to 20 minutes the ABS, SRC and Break light goes on with the message "break failure stop safely".
The battery is replaced (smaller than original).I've found out after the purchase.


Answer
Valdo,
If the message said brake failure, that could indicate a faulty line or leaking caliper, bad master cylinder, etc. The car needs to be inspected and the codes need to be read. I advise a shop that knows the Volvo as they tend to find the problems in a timely manner. The ABS light means there are codes to be read and repaired and so does the SRS light.