The rust does nothing for the appearance of the vehicle but thanks for your comments.
As far as I am aware, the 'as new' finish on brake calipers is a result of passivate plating. Unfortunately, this comes off in time - but the worst thing is alloy wheel cleaners! They absolutely strip the plating off leaving them looking like untreated metal, which essentially they then are. Although I don't like the 'rusty' look, I would find it hard to hold Lexus responsible for this in say the same way as alloy wheels corroding. I think I would feel a little sheepish going into a dealer and asking them to put my car on the ramp, strip off the wheels, the brakes, replace calipers (and hence also the pads) with new ones, bleed the brake hydraulic system - when within 2 years, it will have gone like that again.
If you were to go through all that trouble, I would ask to collect the new calipers from the dealer and have them professionally enamelled up somwhere before being fitted. In that way, their durability of appearance will be greatly enhanced and much more resistant to acidic alloy wheel cleaners that they use when they valet a car at service time.
Thanks very much for your comments.
You clearly have the technical knowhow on the subject and I understand the points you make. However my point is that this vehicle was not cheap and is supposed to maintain its looks well beyond the first 12 months given that the owner takes care of it. I personally have not used alloy wheel cleaning substances on this vehicle at all.
Your comments identify a way in which the problem can be overcome and given that this works satisfactorily then I, as the customer, would expect Lexus to stanby its product and have such work carried out to ensure that their products look good and attract the would be next Lexus purchaser.
Thanks again.