well i can tell you because i used to own one.
that is a 1985 model huffy racing 30
id did have pads and a rear caliper brake originally.
these bikes sold for brand new i think i paid like 60 bucks for mine.
there was a stripped down version as well in the late 80's which could be what this is which sold brand new for 35 bucks.
so im guessing anywhere between 85-89 for model year.
unfortunately it was a really low end bicycle and very few survived the thrashing and abuse boys gave their bikes as kids. so it's kinda cool you scored one and cannot beat free.
Sean