I have not changed the pads yet on this F6B but have many times on other bikes. I do find it necessary to release some pressure when pushing back the pistons to allow room for the thicker new pads. I use a large flat blade screwdriver before removing the old pads and a wrench and while spreading the old pads simply by twisting the screwdriver, I crack the bleed valve just a bit to release that small amount of pressure. It is a very small amount and is easy to catch or wipe up. I use a vac and hose to pull out the old fluid while adding new to the reservoir. I do not bleed every time I change pads. That may change as these pads are lasting longer than pads have for me in the past on other bikes.