I was driving my Rambler American on sunday, trying to time the most power out of the engine. I stepped on the brakes hard 1 time, like I have b4 w/o issue and somthing went clunk and then sounded like a flat tire when turning on the drivers front.. now when I step hard on the brakes under movement, the secondary shoe seems to push out and grind against the drum. I pulled the drum off and inspected everything and it all looks ok except where it's pushing out on the bottom of the secondary shoe, can see a contact point.. Drums are brand new but could a warped drum pull out on the shoe? it uses an inferior ( I think anyway ) spring hold down design, where there is no solid nail.. Maby a streached out hold down spring could do it?