Location/task/design of ESP charging pump - GF42.45-P-4100A

MODEL 140 with CODE (472a) Electronic stability program (ESP)

MODEL 129 with ENGINE 104, 119, 120 with CODE (472a) Electronic stability program (ESP)

MODEL 210 with ENGINE 119 with CODE (472a) Electronic stability program (ESP)

Fig 1: Identifying ASR/ESR Charging Pump

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: Identifying Pressurizing Piston Unit

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 3: Identifying ASR/ESR Charging Pump

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	Location	Behind trim on left front fender.
	Task	The ASR/ESP charging pump (M15) charges the high-pressure/return pumps.
	Design	The suction line leads from the tandem master brake cylinder to the charging pump. The pressure line leads to the pressurizing piston unit (14). It is designed as an internal shaft gear pump. The pressure in the charging pump is limited to 15 bar by a pressure limiting valve.