Technical modifications - RA4200140TA00X
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The familiar acceleration skid control (ASR) from model 126 has been revised and designated as the 2nd version (ASR II).
ASR II can be used in the following models:
- 126 as of 09/89
- 124 (except for 124.034/036) as of 01/90
- 129 (except for 129.067/076) as of start of production
- 201.026 as of 6/90
TECHNICAL MODIFICATION OF ASR II VERSUS 1ST VERSION OF ASR
| ASR | ASR II | |
|---|---|---|
| Front axle speed sensors (L6/1, L6/2) | Long cable with co-axial plug | Short cable with compact plug |
| Rear axle speed sensors | On the right with plug, on the left with connector | Cable with marking for clipping point and plug with letter identification |
| Charge pump relay | With red cover | Completely omitted |
| Pressure supply unit | Return pump/charge pump and pressure accumulator under fender | ASR pressurizing pump (M15), return pump/charge pump (A7/3m1) integrated in ASR hydraulic unit (A7/3). Pressure accumulator separate in units compartment. |
| ABS/ASR hydraulic unit and ASR hydraulic unit | 2 separate housings | ASR hydraulic unit (A7/3) |
| Bleeding points | 3 (1, 2, SP3) | 1 ("SP") |
The ASR II acceleration skid control has been revised and designated as the 3rd version (ASR III).
The ASR III can be used in the following models:
- 124.034/036 as of start of production
- 129.067/076 as of start of production
- 140 as of start of production
Technical modification on ASR III versus ASR II.
The electronics of the ASR control unit (A7/3) have been completely revised.
ASR III is self-diagnostic.
On the model 140.04/05 the control unit also conditions the signals of the ABS lateral acceleration sensor (B24/2) and controls the master brake cylinder switchover valve (Y61).