New rotors = no shudder

R1 Concepts did say they only send one replacement. Hopefully this set will last more than a year... Based on other experiences it would seem I got a bad set.

I'm good for now.
Probably will make some mods in the spring.

I've had the vibration with the GM rotors that were new on my SSE when I got it at 27k miles. It got worse with time, then had the tires replaced, force flex balanced and the rotors cut at the dealer at 60k. Was better for a while then got really annoying both at certain speeds, 60, 70, and when braking down from those speeds. Replaced the rotors and pads a week ago at 98k and the difference is temendous. Took the time to brush down all contact points and torqued the wheels down (thanks to all the input on this site!).
The rust/crust on the edges and in the vents and the broken off rust pieces looked like they could have caused a balance problem on these sensitive front ends. Thanks to all for the commentary. Now it'* on to fixing the gas gauge!

Congratulations! I have brake shudder when braking at that speed (like on highway off-ramps). If it persists after replacing my wheel hubs, I'll know to check my R1 rotors.

MikeBonneville, welcome to the forum, and thanks for your input about brake hardware as well. Start a new thread about your gas gauge, as depending on the year of your Bonneville, I may know of a quick fix.

Make sure you torque your lug nuts to 100 ft lbs,,,,, no impacts or just cranking them down

I always torque them.

This was exactly my problem. Since I was just under the 1 year warranty period R1 said they would send me one new set. Everything is well now but I'm still not sure if there is a problem with the R1'*, the SSEi brake design or is there some other problem that may cause this issue.

I did see the following on wikipedia, http://en.wikipedia.org/wiki/Disc_brake

I did use the Posi Quiet pads that came with the rotors.

"This type of thickness variation has many causes, but there are three primary mechanisms which contribute the most to the propagation of disk thickness variations connected to uneven pad transfer. The first is improper selection of brake pads for a given application. Pads which are effective at low temperatures, such as when braking for the first time in cold weather, often are made of materials which decompose unevenly at higher temperatures. This uneven decomposition results in uneven deposition of material onto the brake rotor. Another cause of uneven material transfer is improper break in of a pad/rotor combination. For proper break in, the rotor surface should be refreshed (either by machining the contact surface or by replacing the rotor as a whole) every time the pads are changed on a vehicle. Once this is done, the brakes are heavily applied multiple times in succession. This creates a smooth, even interface between the pad and the rotor. When this is not done properly the brake pads will see an uneven distribution of stress and heat, resulting in an uneven, seemingly random, deposition of pad material. The third primary mechanism of uneven pad material transfer is known as "pad imprinting." This occurs when the brake pads are heated to the point that the material begins to break-down and transfer to the rotor. In a properly broken in brake system (with properly selected pads), this transfer is natural and actually is a major contributor to the braking force generated by the brake pads. However, if the vehicle comes to a stop and the driver continues to apply the brakes, the pads will deposit a layer of material in the shape of the brake pad. This small thickness variation can begin the cycle of uneven pad transfer"