After driving about 5 minutes the brakes start to almost lock up. It's like someone is holding there foot on the brakes. First I noticed the vacuum line going into the Mechanical vacuum pump was loose so I shooved it into the pump farther and the car began to smoke like crazy. Bad Vacuum pump. So I got a new one from saab and installed it. Well, the smoke is gone but the brakes still feel like they are stuck on and the petal barely moves. You do not need to push hard at all either to get it to stop. No ABS light or anything else goofy is going on. Any ideas?????