1) No. Dumb waste of money on any car.
2) Yes, as per the manual, which you should read.... I'm pretty sure it is more than 40 ft-lbs. Locktite does not affect torque settings.
3) No. Again, read the manual...
4) If the rotor is bad, then you need to replace the pads.
Make sure you change the hub seal and use an OEM RTC3511. New hub lock washer. Make sure all caliper pistons are free.
Pissing people off on the "net" since 1983.
Land Rover. Turning owners into mechanics since 1948.