I have a 2012 fx4 and am experiencing a vacuum issue I can not solve. With 94000km on the truck, I am on vacuum pump number 3. Pump 1 was replaced a 60000, pump 2 replaced just recently with 93000km in an attempt to solve the issue I currently have. The issue I am having is the brake pedal often seems very very hard when braking. All new pads and rotors on the truck. The truck also does not hold vacuum for 2 hours. If the truck is shut off and left to sit for at least 2 hours, the brake pedal is hard as a rock when pressed before the truck is started again. All signs point to a vacuum leak somewhere but I have no idea where to start. Any suggestions?? Thanks in advance!