Please check if your Volvo has Dynamic Stability Traction Control (DSTC.)
Most Volvos have some form of traction control (TRACS) but DSTC is not regular traction control. DSTC is a completely different system. DSTC will attempt to keep your Volvo from spinning out while cornering in hazardous conditions by applying the brakes to specific wheels to maintain stability.
Cars equipped with DSTC have an electrical sensor connector on the face of the of the brake booster (to the left of the brake master cylinder.)
DSTC equipped models have a button on the dash labeled "STC" or "DSTC" that allows you to disengage the DSTC.
