Have a 78 FJ40 pretty much original. I have had it for a long time and I have noticed the right rear wheel will lock up during a panic stop. Over the years I have replaced the brake shoes and I have replaced the brake cylinders. I drive the vehicle daily and park it inside at night. I live in a dry climate so rust is not a concern. I have inspected the brake lines and they appear OK. Has anyone else experienced this problem? Any ideas?