My HR-V is about three years old with 58600 miles. I thought it was about time to replace the brake pads (it wasn't, as it still had about 40% friction material left in it), BUT I made an interesting discovery about the HR-V rear brakes.
Here's a video that may be helpful in rewinding the rear brake pistons when new pads need to be put in.
That's a good question.. It looks like in the video the gentleman is using a torx bit. So if you have a nice set of torx bits you should be all set. (google for "brake piston torx" images)
