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2012 Toyota Sienna Minivan LE 8-Passenger 4dr Minivan (3.5L 6cyl 6A)
 slight thumping noise heard when applying brakes
 Our 2012 sienna van with about 3000 miles started to make a slight thumping noise when applying the brakes. Sometimes the noise is louder and there is more than one thump. I took my van in for service 3 times for this problem. The first two times the service dept. claimed they didn't hear any noises. The third time I drove the van with a mechanic and he heard the noise. He thinks there was a tsb issued on this problem and that the brake pads were moving and this was considered normal. However, I believe this is not normal and Toyota should investigate further. Does any other 2012 Sienna owner have this problem? 