What type of liberals were the founding brothers? Positive or negative?

To answer this question you would need to define "liberals". The Founding Fathers believed in government for and by the people.... something almost unheard in a world of monarchies. They believed in liberty, equality, and the opportunity for individuals to build the lives they dreamed of..... to pursue happiness. Their ideas were extremely liberal in a time when governments were structured around "divine right". Thankfully, they also provided a document with so much forethought that it continues to work today.