Hi to all, this is my first post. Just bought this bike, it's kinda beat up but I bought it because I'm fascinated by one feature. It has a monster rear disc brake that looks big and thick enough to stop a Volkswagen. The bike looks like it could be from the 60's or 70's (don't think from the 80's or 90's) but I'm not sure, and I'm very impressed about a disc brake on a bike that old. It still works. I haven't been able to find any information on the bike or the disc brake system, but would sure appreciate anyone directing me to some or providing some information here as I'd like to get the bike road worthy again. Please accept my thanks in advance of any assistance. All the best. John.