With the engine running - when I first push on the pedal with moderate effort, it feels pretty firm and stays there. If I push hard, it slowly fades near all the way down to the floor. If I then pump it, it uses all the vacuum and with a gauge on it - vacuum goes to zero. It is the pumping that uses the vacuum. If I hold my foot down steady - even with the pedal near down to the bottom, the vacuum comes right back up to 15"-18".
Note - the truck is in my shop. When actually driving - the brakes grab with such little effort - I just about never stomp on the brake like this. That said - any other vehicle I have ever owned had a brake pedal that held steady and did not fade (unless there was something wrong with it). I have a 1995 Ford F150 with a gas engine and its brake pedal will not fade under pressure. I know the 1995 F150 gas-engine rig has a single diaphragm booster and also has a large "soup can" vacuum reservoir. My 1994 F250 with the 7.3 diesel has a dual-diaphragm booster and no large vacuum reservoir. Just the little plastic reservoir on the AC box.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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