Iimpawu zokufaka kunye nemveliso ye-vacuum booster. Kukho indawo ye-inflection kwi-curve nganye ehambelana nezidanga ezahlukeneyo ze-vacuum kumfanekiso, obizwa ngokuba yindawo yokuncedisa amandla aphezulu, oko kukuthi, indawo apho umahluko woxinzelelo osebenza kwi-servo diaphragm ufikelela kubuninzi bawo njengoko amandla okufakwayo asanda. Ukususela kweli nqanaba, ukunyuka kwamandla okuvelisa kufana nokunyuka kwamandla okufakwayo.
Ngokutsho kwe-QC/T307-1999 "IiMeko zobuChwepheshe be-vacuum Booster", iqondo lokucoca lomthombo we-vacuum ngexesha lovavanyo yi-66.7±1.3kPa (500±10mmHg). Iimpawu zegalelo kunye nemveliso ye-vacuum booster zigqitywe kwangaphambili yindlela yokubala. Ngokomgaqo wokusebenza we-vacuum booster, iiparitha ezimbini zeempawu kwi-curve yeempawu zinokuqikelelwa: amandla okufakwayo ahambelana neyona ndawo iphezulu yamandla kunye nesamba; Umlinganiselo wamandla emveliso ukuya kumandla okufakwayo phambi kowona mmandla mkhulu wamandla, oko kukuthi umlinganiselo wamandla
