Removal and installation of ASR hydraulic unit (A7/3) - RA42001400816X(42-0816)

WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.

Operation no. of operation texts and work units or standard texts and flat rates 42-0125

Fig 1: Identifying ASR Hydraulic Unit Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Ignition	OFF .
Hydraulic system	depressurize. To do this, open bleed screw "SP" on ASR hydraulic unit (A7/3) approx. one turn, allow the complete contents of accumulator to discharge into the brake fluid receptacle.
Cover hoods (3,17)	unclip or remove after slackening the screw (2), put back on.
Electrical connector	detach from ASR hydraulic unit (A7/3), attach at. Follow installation note.
Ground, components compartment (5)	disconnect, connect.
Hydraulic lines	unscrew from, screw on to the ASR hydraulic unit (A7/3) using a 9 x 11 mm double ended flat flare nut ring wrench, 15 Nm.
Hydraulic line "BA" (6)	unscrew from, screw on to the ASR hydraulic unit (A7/3) using a 12 x 14 mm double ended flat flare nut ring wrench, 15 Nm. Installation note Check O-ring on connector piece (9), replace if required.
Mount (10)	detach, attach by unscrewing the screw (11).
ASR hydraulic unit (A7/3).	remove, install at the rubber mounts.
ASR hydraulics	bleed and check for leaks (42-010).
ASR electrics/electronics test program Models 124.034/036, 129.067/076, 140 Fault memory	perform (42-0822 or Diagnosis Manual - Chassis) readout and erase in accordance with Diagnosis Manual - Chassis.