My 2005 S60 AWD T5 tends to have brake problems only when the car sits overnight. Its tends to act like the brakes are not being assisted from the booster. After the car is started and warmed up for a while the brakes are OK until the next day. I am thinking it could be the brake pressure switch or vacuum pump but where is it located and how do I replace it? I found the part but can not find the part that looks like it on the car. I also have seen that the s40's had recalls on some of their brake parts. Any Help? Thanks in advance.