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Vacuum pumps
Volkswagen TDIs use a vacuum pump driven off the camshaft.
They use the vacuum for power brakes and for the N75 valve to control either:
max. boost via the wastegate of the turbocharger (older TDIs)
or
changing the angle of the vanes in the VNT turbocharger (variable nozzle turbocharger)
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97 Passat TDI Wagon
Bosio 520 DLC nozzles, chip tune
Mufflerectomy, ALH Injection Pump
317k miles
Scan Gauge II
full belly pan
26 gallon tank 
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