The maintenance tune ups, for most of the cars, are scheduled at 30K, 60K , 90K miles. If you are late on the scheduled maintenance tune up, of course your car needs it, but to find the problem you need a "Check and Advice", only at Volvo dealer. It cost $65 to $100, on the top of tune up cost.
Volvo has had a lot of trouble with ABS control units. Yours will most likely need to be replaced. You can either replace it with an exchange unit from a Volvo parts supplier or send yours to BBA reman. in MA for repair.