Here are the pictures ... sorry forgot to take pictures of the side view but might do it another day.
The good shoe:
The bad shoe:
I've replaced the wheel cylinder and put in new brake shoes.
98DAKAZ you are absolutely right. One side of the cylinder piston froze, it put the shoe in a permanent expanded position and that's why it's worn out.
On the other hand, the other shoe (toward the front) was rarely used because the spring on the crossmember bar was missing. Clearly the previous owner did a lousy brake job.
I am glad I fixed the brakes, the truck is much quieter now. But there were a few frustrating moments. If I had to do it again, I would've listened to other advices you guys gave me: invest in a flare nut wrench (3/8 size) for loosening the wheel cylinder; buy a drum brake spring tool.
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Last edited by tylan; 04-18-2014 at 12:17 PM..
It almost looks to me like only the one shoe is moving. The wear on the backing plate where the shoe sits reinforces that. It has been moving a lot, more than just you having to loosen the shoes to remove the drum.
The undamaged shoe looks almost unused.
It's usually caused by a frozen wheel cylinder. It is possible that only ONE side is moving.
I second what both of them said. I don't see any metallic particles on the full shoe and I see plenty on the broken one. I would expect that bad shoe to be 1/16 to 1/8 thinner than the full shoe. Also, was there brake fluid sitting in the brake drum?