Technical modifications - RA4200202TA00X

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.

DISTINGUISHING FEATURES ASR I, ASR II, ASR III AND ASR IV

ASR I	Model 126	up to 08/89
Features	Separate hydraulic units for ABS and ASR ASR accumulator pressure supply from separate charge pump ASR control functions Brake intervention Throttle valve closure
ASR II	Model 124 (except 124.034/036)	as of 01/90
	Model 126	as of 09/89
	Model 129 (except 129.058/063/067/076)	as of start of production
	Model 201	as of 06/90
Features	ABS and ASR hydraulic unit combined into one compact hydraulic unit ASR accumulator pressure supply by charge pump in the hydraulic unit and additional pressurizing pump ASR control functions Brake intervention Throttle valve closure
ASR III	Model 124.034/036	as of start of production
	Model 129.058/063/067/076	as of start of production
	Model 140	as of start of production
Features	Hydraulics design as ASR II ASR with MSR MSR =Engine friction moment control Vehicles with module box in engine compartment System interlinking of ASR, EFP control units and EZL/AKR control unit via CAN data line System with diagnosis fault memory (permanent memory) Faults can be read out/erased via diagnosis test coupling (38-pin) with pulse counter or hand-held tester ASR control functions Brake intervention Throttle valve closure Ignition timing adjustment - retarded MSR control function Throttle valve opening
ASR IV	Model 202	as of start of production
Features	Hydraulic unit with two 2/2-way valves per wheel Uprated pressurizing pump in wheelhouse of left front fender Hydraulic function without accumulator, pressure switch and charge pump

Internal depressurizing sequence of ASR hydraulics
Brake fluid reservoir with additional switch -ASR brake fluid check and return line from ASR hydraulic unit
System interlinking of ASR, EFP and HFM control units via CAN data line
ASR with MSR
MSR =Engine friction moment torque control
System with diagnosis fault memory (permanent memory) Faults can be read out/erased via diagnosis test coupling (38-pin) with pulse counter or hand-held tester
ASR control functions
- Brake intervention
- Throttle valve closure
- Ignition adjustment - retarded
MSR control function
- Throttle valve opening