Glad you're getting a non-contact thermometer! It's a great piece of diagnostic kit for brakes, wheel bearings, tyre temperatures, cooling issues (cold spots in rads, etc). I've also used mine to balance my central heating system!
Let us all know how you get on.
Warped discs would generally only show themselves when you actually brake, once the pads have been 'knocked back' by the disc run-out, there will be no vibration whilst driving along.
However, a sticking calliper would cause the pad to be in contact with the disc the whole time and cause both heat build up and vibration, which would get worse with the heat build up.
As I mentioned before, a mis-adjusted or sticking handbrake can do the same, so don't forget to check the rear handbrake drums as well!
Finally, if you still have issues, dynamic balancing might be of benefit to you. Find a specialist who can do this, it involves balancing the wheels whilst still fitted to the vehicle.
Finally, finally, it could be play in the steering rack (can't remember if I, or someone else, has already mentioned this earlier in the thread). It's not uncommon for the pre-load to require a tweak to eliminate lash in the steering rack.
Jon 1992 RR Classic 3.9 efi Vogue
2014 Disco 4 HSE
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Both my fatties now gone...
Previous: 2011 L322 4.4 TDV8 Vogue SE /// 2002 L322 4.4 V8 HSE /// 2009 Discovery 3 2.7 TDV6 XS /// 2004 Defender 90 TD5 /// 1993 110 V8 Snatch Landrover /// 2005 Discovery 3 2.7 TDV6 SE (Aus) /// 1990 110 Isuzu 3.9 County (Aus) /// 1976 Series III Trayback (Aus)
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