Is it a disc brake? Is it broken, or just need new pads? What brand is the brake? Brakes aren't too difficult to deal with, unless they are hydraulic, but I don't think those are on your bike. A shop probably wouldn't charge very much either if you're not comfortable doing the work yourself.
What you have is a Dia-Compe Roller Brake, any bike shop can repair or replace it for a reasonable price. There are several models, not sure which model you have, but an entire new one can be purchased for $25 +/-.
Google search: https://www.google.com/webhp?sourceid=chrome-instant&rlz=1C1QJDB_enUS640US640&ion=1&espv=2&ie=UTF-8#q=dia compe roller brake
What Paul said!J.R, thanks for the info and link. I did not know the term "Roller Brake"
I called a LPedegoBS and was told that they could throw the brake in if i do the full tune up which is $95. I've never done the tune up at the shop (or myself) and have no idea if this is a fair price.
Roller brakes are good, kind of a drum/disk hybrid. They aren't as efficient as a pure disk brake, but better than rim brakes. You wouldn't want the extra weight on a non ebike, but they have been used on all sorts of recreational bikes. I'd say given the age of your bike, it would well worth the money to get the tune-up.If you're not comfortable doing your own maintenance, a regular tune up is a must - price sounds reasonable considering they'll be fixing the brake as well.