Took my bike in for routine service and had my tires replaced at same time. While the tires were off mechanic suggested that I replace brakes and offered to do It for cost of pads. Ok cool by me. Now my brakes make an unacceptable notice when riding and stopping. It's a loud whirring noise. I took the calipers off and noticed that he had installed one of the absorbers wrong and fixed that. But everything else (springs etc...) was correct. He installed ebc sintered pads.

Has anybody else had this issue? Is there a fix?