I helped the optometrist put new brakes in his truck, the left brake was dragging. And it was still dragging afterwards, so this sunday we ripped it apart again. The brake line was rusted and nearly collapsed, and the aluminum caliper sticky. So I replaced the rusted line and unstuck the caliper by compressing and expanding it several times, and then I hung out the side of the truck and watched/listened to the brakes, and tweaked until everything stopped and nothing dragged.

I’m probably a little old to be hanging of the side of a pickup bed by one arm and one leg while another guy drives it around, but common sense has not been my milieu for years.