Vacuum Pump

Vacuum Pump

Like the 911 Carrera (997) and Cayman S (987), the Boxster S engine employs a mechanical vacuum pump (A) instead of a conventional vacuum amplifier connected to the intake manifold to provide the vacuum for the brake booster. This pump is driven in tandem configuration together with the oil extraction pump of the left cylinder head by the exhaust camshaft of the left cylinder bank.

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