Worn/broken spring shackles-word of warning
If your rig is more than a few years old, crawl underneath and inspect the shackles that attach to the ends of your leaf springs. Check all the brackets for wear. I just replaced a sheared off spring ...
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While you're at it, check your brake wires to make sure they are not chafed or rubbing on anything. I had to spiral wrap and tie up mine because they were already polished from rubbing after the first year.
