I have been using some Performance Friction semi metallic pads on F450 and F550 trucks at work. They are there heavy duty top of the line pad for extreme service I was told when I shopped for them. Came from Oreillys. I am not impressed with the performance.

I test drove one at work just today with less than half a load on it after a repair and thought, woo these brakes suck. They worked but just did not feel good and I am doubting if they could lock up. You know what I mean?

The brakes are not that old and it got new rotors and pads when I did the brakes. They are power brakes.
I think the pads are more prone to glazing over and just today I was thinking to myself I was going to try a different pad and not metallic.

Thanks for letting us know what the final out come was. Glad you got it fixed.