Re: Drum brake experts
The metal part of the brake shoes are indentical, primary or secondary. The difference isn't the thickness, but the length of the friction material. The ones with the LONGER friction material goes TO THE REAR OF THE VEHICLE. If they are identical they are interchangable. The rear one does the majority of the stopping.
But that's not the click, nor is it the wear on the backing plate.
You had the drums turned. The yo yo that did it didn't finish the job. When he cut them, he used too fast a feed, it left a fine screw thread on the inside of the drum. He should have done a fine finishing cut, almost as a polishing cut as the last cut.
When your linings first touch, that thread he left in the drum surface pulls the shoe with it, then it slips, then pulls, slips, pulls, etc - click click click - and each time it wears the backing plate a little more.
Look close at the machined surface of the drum, you'll see the tiny threads.
Rough it up with emory paper - scratch it so the threads are no longer apparent.
File/grind the backing plate notches flat again, lightly lube the spots where the shoes touch the backing plate - enjoy.
BTW - the "lifetime" lining are trash. They are super hard material to last a long time. The cheapie linings are much softer, they don't last quite as long, but they do stop nice!
Brake manufacturors seem to have forgotten -- BRAKES ARE A FRICTION DEVICE!