Testing the Hydrovac is easy...on the first engine start of the day pump your brakes up and hold with medium foot pressure, then start the engine. As you build vacuum you'll feel the brake pedal fade away slightly as the Hydrovac applies pressure to the system...it's working!
Since you intend to load and use your truck, I'd keep the Hydrovac and make sure it's working. It adds about 1,000 pounds of additional pressure to the system making it so every stop isn't a PANIC stop!
Mike B
