Have a 2009 BMW 328i with 78,000 miles. In the last year, the front brake pads and rotors have been replaced by the dealer 3 times, each time because of “warping” which is their diagnosis of a steering wheel shimmy (left to right oscillation) that occurs under light to moderate braking, especially at highway speeds.
The strange part: replacing the rotors and pads seems to solve the issue, but only for a few hundred miles.
I am led to conclude that something is causing very accelerated uneven deposition of pad material to the rotors - but what could it be? Suspension components and bushings have been inspected and check out. So do calipers. Recently completed: four wheel alignment, wheel rounding and balancing did not solve the issue. One dealer will no longer look at problem until “all four tires replaced” - but tires look fine, they are OEM RFTs with about 4/32nd’s of tread left. Car seems fine cruising on highway - steering wheel shimmy only occurs under braking.
Your theories are welcomed!