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One thing that I noticed was the linings on the secondary shoes are about .050" thicker at mid shoe than they are near the top of the shoe.



That is done to compensate for a drum that has been turned, typically back when it wasn't recognized as a health threat we would grind brake shoes so the radius of the shoe face matched the brake drum...If you don't do this & install the new shoes only a small portion of the lining will touch...Now they arc the shoes to near the max drum size & let them wear in...Grinding shoes became illegal many years ago & the equipment virtually doesn't exsist anymore outside of a manufacturing facility...

If your brake shoes are both touching the anchor pin at the top & fully seated to the adjuster at the bottom the shoes could be made wrong...