I'm sorry but you've lost me there. The prime mover for the turbo is the
engine exhaust gases which spin a rotor and compress air by means of vanes
connected to the same shaft as the power turbine. In my basic knowledge of
these turbo systems there is also a dump valve which allows excessive
pressurised air to escape - but no vacuum. In fact there is such a shortage
of vacuum associated with a diesel engine that a vacuum pump has to be
installed, often driven from the engine camshaft, to provide vacuum for the
braking system - as already stated by Mr Bartam.
Diesels and vacuum are anathema and do not exist in the same universe.
Perhaps an explanation of the symptoms you originally experienced may help?
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