the ejector or venturi to remove air from the vacuum system reservoir between time t 3 and t 4 the engine torque command is low and the engine is at idle speed the intake manifold pressure is also below atmospheric pressure brake booster vacuum reservoir pressure and vacuum system reservoir pressure briefly increase as the brake pedal is depressed air that is released into the brake booster vacuum reservoir is quickly removed as the air flows into the engine intake manifold via the vacuum system reservoir shortly before time t 4 the brake pedal is released and pressure in the brake booster vacuum reservoir and in the vacuum system reservoir increase however the pressure rise in the vacuum system reservoir lags the pressure rise in the brake booster vacuum reservoir at time t 4 the engine torque command increases followed shortly thereafter by an increase in engine speed intake manifold pressure is also increased so that the engine air amount can be increased to provide the commanded engine torque pressure in the vacuum system reservoir increases to a level above pressure threshold 502 causing the controller to reactivate the ejector or venturi pump as indicated by the high level ejector pump command signal in fig4 the ejector or venturi begins to draw air from the vacuum system reservoir and pumps it into the engine at a location upstream of a turbocharger so that air enters the engine where pressure in the engine air intake system at a pressure tap is lowest.