2008 Volvo S40 Owner's Manual - Page 137

EBA is automatically deactivated when the brake pedal is released. NOTE When the EBA system is activated, the brake pedal will go down and pressure in the brake system immediately increases to the maximum level. You must maintain full pressure on the brake pedal in order to utilize the system completely. There will be no braking effect if the pedal is released. EBA is automatically deactivated when the brake pedal is released. When the vehicle has been parked for some time, the brake pedal may sink more than usual when the engine is started. This is normal and the pedal will return to its usual position when it is released. 149 06 Starting and driving Stability system Stability Traction Control (STC)/Dynamic Stability Traction Control (DSTC) The stability system consists of a number of functions designed help reduce wheel spin, counteract skidding, and to generally help improve directional stability. A pulsating sound will be audible when the system is actively operating and is normal. Traction control - TC This function is designed to help reduce wheel spin by transferring power from a drive wheel that begins to lose traction to the wheel on the opposite side of the vehicle (on the same axle). TC is most active at low speeds. This is one of the stability system's permanent functions and cannot be switched off. A - thumbwheel B - RESET button