Hello I have a question for all you guys when the truck is off the brake pedal gets hard but when I turn the vehicle on the brake pedal goes to the floor I had a small leak in the brake line so I fix that and then I replace the power break booster and still have the same issue. The brake pedal still goes To the floor when the truck is running but when it’s off the pedal pump up and gets hard So what could it be and I also bleed the brakes too. Thank you