Brake Disc Pads problems of the 2015 Toyota Sienna

Brake shaking/shutter upon braking down a steep hill. The 2015 Sienna awd has 45,000 miles. The Sienna has mostly been driven on flat to mild sloped interstate roads that do not require braking. Recent inspection by a tire shop reports 12/32 remaining on brake pads showing minimal to no wear. Upon driving down a steep road requiring braking to control speed there was violent shaking/shutter in the front end. Thinking something was broken, reduced the speed and used transmission to control speed to reduce brake application. This relieved the violent shaking. Checking internet there is a Toyota TSB for this problem replacing brake pads and additional work. The problem has to be reported to Toyota within the 36,000 mile warranty to have the problem fixed by Toyota. This problem needs to be fixed by a safety recall when oem remain on the vehicle.

Brought vehicle into dealer for routine service and maintenance. Service technicians informed me that the brake rotors were "severely scorched" and "warped," and recommended immediate replacement of all pads and rotors. Technician asked if I tow a trailer or routinely haul heavy items, neither of which I have ever done; technician then asked if I ride my brakes when I drive, which I do not. Vehicle has 29k miles and is used only for city driving for just my wife and I (and occasionally my son's family, which consists of two adults and two children), but I have never driven this vehicle in an abnormal fashion. I didn't notice anything out of the ordinary while I drove it, so I consider myself lucky the technicians caught the damage before the brakes failed. This is the forth van I have owned but my first Toyota, and I've never had a brake issues with any of my previous vehicles--not even the van that I drove back and forth to work 50+ miles a day and cross-country three times, racking up well over 100k miles.