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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