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 - Massey Ferguson 35 (and up) Tractor Assembly Notes - by Jack Wetmore. These assembly notes are for Massey Ferguson tractors with a two stage clutch and 6 speed, 8 speed and mutli-power transmissions. I see a lot of discussion forum messages regarding damaged clutches from improper assembly. The objective is to have the engine and transmission slide together safely and easily until the gap between the two halves is less than 1/4", BEFORE tightening any of the bolts holding the two together. Using bolts to draw the two halves together will damage the PTO
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