Vacuum Pump: Description and Operation

Vacuum Pump

The 911 Carrera (997) 3.6 and 911 Carrera S (997) 3.8 liter engines employ a mechanical vacuum pump instead of a conventional vacuum amplifier to provide the vacuum for the brake booster. This pump is driven in tandem configuration together with the oil scavenging pump of the right cylinder head by the exhaust camshaft.










This design enables a high and constant level of vacuum supply and subsequent effective brake boost even when the most unfavorable underlying conditions apply, e.g. low external air pressure at high altitudes, and in highly dynamic driving involving a high degree of full-load operation, e.g. on race tracks.