Iimpawu zokufaka kunye neziphumo ze-vacuum booster. Kukho inqaku lokutshintsha kwigophe ngalinye elihambelana namadigri ahlukeneyo e-vacuum kumfanekiso, obizwa ngokuba yi-maximum power assist point, oko kukuthi, inqaku apho umahluko woxinzelelo osebenza kwi-servo diaphragm ufikelela kwinqanaba eliphezulu njengoko amandla okufaka enyuka. Ukususela kweli nqanaba ukuya phambili, ukunyuka kwamandla okukhupha kufana nokunyuka kwamandla okufaka.
Ngokutsho kwe-QC/T307-1999 "Iimeko zobuGcisa ze-vacuum Booster", iqondo le-vacuum lomthombo we-vacuum ngexesha lovavanyo yi-66.7±1.3kPa (500±10mmHg). Iimpawu zokufaka kunye neziphumo ze-vacuum booster zimiselwa kuqala ngendlela yokubala. Ngokomgaqo wokusebenza we-vacuum booster, iiparameter ezimbini zeempawu kwi-characteristic curve zinokuqikelelwa: amandla okufaka ahambelana nendawo ephezulu yamandla kunye ne-sum; Umlinganiselo wamandla okukhupha amandla okufaka ngaphambi kwendawo ephezulu yamandla, oko kukuthi umlinganiselo wamandla.
