Not very sure
If the chamber is building vacuum in front of the piston when the pedal is released, then the only thing to do is to polish the inside part of the chamber where the piston runs.
There is a special light oil for vaccum chambers too, so find some of that rather than ordinary oil. Ordinary oil might have damaged the piston rubber?
The other possibility is that the return spring might be weak? or possibly the master cylinder is stiff and the return mechanism there is holding it forward?
Is there anything in the truck manual about this? I don't have a t110L manual here.
Gordon
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Gordon, in Scotland
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