Hi. I am new to bike commuting; I just got a used Raleigh SC 30 (2003). I have been reading the forums, and I know this is a heavier bike, etc., but my commute is short (less than 4 mi. round trip) and the roads here are awful (under construction for the past 6 months). I know I will have several questions. The first is: What's the deal with brakes? The specs on the SC 30 say it comes with Linear Spring Brakes. What does this mean? What kind are they? I am confused!