Find a 'cheap" type fluid that is compatible with your 'expensive' stuff.......bleed liberally with the cheap stuff to get rid of contaminates...then...
With all new parts I would suspect the first fluid out the bleeders is going to be contaminated from all the small particles, bits of metal, and oil...
no Sun will greatly affect tire temps and pressures. I run a pressure and temp monitoring system on my trailer and see the same thing based on which...