Hi CutthroatSlam,

Well I don't know if you've ever looked at your front brake design, but the pads glide "back and forth" on two hardware rods. But the guiding rods got rusty, so the pads became FIXED, against the front rotors; and unable to retract away from the turning disc's!

So the caliper pistons were retracting as they should, but the rotors were still damaged, do to the excessive heat from the friction of the brake pads being frozen against the discs! This happened back in 2018...!

Now I lubricate the hardware regularly! The rotors turned blue from the excessive heat! It turns out, 5'th Gen 4RUNNERs are subject to chassis/frame rust, depending on where you live!

~rig~ Best to you, Cheers!