Hy plasticman, Welcome. Have you test driven the truck? Hydrovac equipped trucks take a bit of getting used to, one of the tests you do to check that the booster is functioning is to step on the brakes a couple of times with the engine off, then hold your foot on the brake pedal and start the engine, the pedal should go closer to the floor with the engine running. Are your brakes properly adjusted? If your brakes need adjusting it will give you a low pedal. If you had a solid but low pedal without the engine running then it should be lower with the engine running. Hope that helps.
