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I'm not 100%, but I've read that they are made of ductile cast iron.

Seems to be holding up pretty well. The hardest part was finding someone willing to do the job. I made sure to lube up the mounting ledges as well as the little ears on the brake pads to try to...

I have a feeling the grooves occur when the caliper mounts on the knuckle aren't greased and are left dry but I have no proof. I had mine welded last week and even after I explained to the mechanic...