SO I bought an old bike today with a way old coaster brake. I have no idea what year it is the seller says sixties buts im thinking 70s or 80s. anyway the coaster brake has a few issues. when you use it to brake and then start pedalling again it doesn't catch and you just spin the pedals and nothing happens. to get it to move forward again you gotta pedal backwards, so it hits the brake again, and then pedal forwards and it engages and then works again. Also occasionally it seems to work as a fixed gear but only at very low speeds, and then not always. What i mean is if i very slowly come to a stop and I pedal backwards to engage the coaster brake it sometimes actually pedals the bike backwards. most of the time it just acts as a coaster brake should though.

Is this salvageable? I'm able to ride it like this and I intend to just use it as a cruiser but if I can fix it I would like to. I'm taking it to a bike co-op on monday to see if they can help, but any advice is appreciated.