So my wife's bike has some Deore M615 brakes and I have some SLX M675. We moved from BC to Sask with the bikes packed up in shipping boxes and were subsequently reassembled. In my former life I was a bike tech so I am certain no lubes goop or otherwise hit the pads or rotor, both bleeds were good, and all lines are intact. They were shipped over winter. When we went to use the bikes in the spring the rears lost most to all pressure and there was the telltale signs of contamination of the pads front and back.
Do these brakes have a habit of leaking at the caliper? Or in cold weather? I'm going to assume there is no point repairing them as always. I would rather stick with Shimano because the ergos work for my wife, so would another set of 615s be a repeat experience? Should I look at Avid instead?