After driving a vehicle for a while, you kind of get to know where the sweet spot is in pedal travel and just how much initial brake pressure to apply for smooth stopping. Lately, my pedal will sometimes require me to push it further to get the same reaction as it does at a higher (regular) spot the other 50% of the time. Is this possibly vacuum related or is there a common issue with the 80 on this? My good buddy Search couldn't help me. Pads are all good, fluid is clean, level is good. No leaks, no air in lines- at least I don't think so.