Brakes leaking within 200 miles-dot5 fluid

You cannot simply flush the system when converting to DOT5. I don't know why in the hell anybody thinks they need DOT 5 anyway. Unless it's specifically required from the factory, there's absolutely no need for it.

To do a conversion properly, every piece of the brake system should be either disassembled and thoroughly cleaned and reassembled......or replaced. DOT5 cannot be mixed with any other fluid type. Not even one single trace, or you end up with results like yours.