recently my engine seems to brake more than before. Say when i go down a hill in fourth gear, where before i needed to brake a couple of times to hold the speed limit, i now do not have to brake. This has been going on since a incident accured where the car suddently felt really heavy, and i actually thought i had a flat tire or a locked brake. Pulled over to nearest gas station to check tire pressure and brakes, but all was ok. When i drove off the problem was gone, until i noticed that the car now brakes more on engine.. Anybody got a clue what this might be? I had a 60k service three days ago (car has run 33k), and asked the workshop to see if the could figure it out. They checked the brakes, and could not find any other issues either..