Ed and Truckernix - thanks for your replies. I understand and appreciate where you are both coming from.

I discovered I will need to pull the wheel back apart for I have been reviewing pictures I took several months ago of the brake system and think I spotted a cracked brake shoe. The actual metal structure, not the lining. My picture resolution is not the best, so it will come apart for a closer look. Of course this nixes the antique truck show this weekend.