Steering wheel shake when braking but it is NOT the rotors

Did you check or change the front bearing when the rotors were changed?

Hubs were checked and deem ok. We have not found anything loose in the front end at all

There is really no way to check bearing other then pulling on the wheel when the wheel is off the ground, anything more then an 1/8" play and they should be changed. taking then out and looking at them will do nothing.

The hubs were checked by Cadillac, so I assume they actually did it. I had also checked movement in wheel with car off the ground and felt nothing but had them check entire front-end.

Ok let’s assume that the rotors, brakes and tires are all OK at this point. Let’s look at other probable causes, how about the calipers, maybe they are binding when you apply the brake. How about the hoses going to the calipers, maybe they are collapsed on the inside on the hose somewhat not allowing enough brake fluid to get to the brake. Do you have electric steering on the car, if so I have seen them go bad and show the same symptom as a bad rotor

FIXED IT!! I'm not 100% sure which of these was the actual problem but I decided to back up to a known spot and start over. I had the old rotor resurfaced and put them back on with the new pads, but that did not fix the problem. So, then I put the old pads back on the driver side and bled that caliper and BAM...no more shake at all!! I drove it for a few days to make sure the shake was gone.

cont.... With the shake complete gone, I put the new pads back on the drivers side. The shake did not return. What that tells me is that either the Pistons on that caliper were stuck or air in the caliper was not allowing them to work properly.