Go to Ford for some orignial ones. They may cost more money than aftermarket ones, but they may also have a heavy duty version. I have been a fleet mechanic for a towing company for some time now and we only have Ford trucks. We never machine rtors, and always use original Ford ones.
warped brake rotors, have them resurfaced.
Normally this is caused by warped rotors. The fix, is to have the rotors resurfaced or replaced.
Your brake rotors are warped and need replaced/resurfaced.
If you have a pulsation on stopping the rotors are warped. They will need to be checked with a micrometer to determine if they can be resurfaced of discarded. The government set the regulations.
Could be that the rotors are "out of round" and need either to be resurfaced or replaced
Rotors out of round and need to be replaced or resurfaced?
Rotors may be out of "round" (lateral runout) and need to be resurfaced or replaced
They need replaced when they wear out.
The new pads will last longer, work better, and be quieter if the rotors are resurfaced.
Were the rotors resurfaced or replaced, or just the pads? Warped rotors are the most common cause of vibration when braking
your brake rotors are warped. You should repalce you brake pads and have the rotors resurfaced if possible, or replaced.
If you have a pulsating on stopping is an indication they are warped. They would have to be checked with a micrometer to tell if they can be resurfaced.