Overview of Bosch 81 ABS/ESP Brake System
| 1 - | Rear right speed sensor -G44- |
| q | Removing and installing → Chapter |
| q | Can be checked in „Guided Fault Finding“ using vehicle diagnostic, testing and information system -VAS 5051B- or -VAS 5052- |
| 2 - | Rear left speed sensor -G46- |
| 3 - | ESP sensor unit --G419-- |
| q | Fitting location: under seat (left-side) |
| q | Removing and installing → Chapter |
| q | 9 Nm |
| q | Combined lateral acceleration sender -G200-, yaw rate sender -G202- and longitudinal acceleration sender -G251- |
| q | Can be checked in „Guided Fault Finding“ using vehicle diagnostic, testing and information system -VAS 5051B- or -VAS 5052- |
| q | Observe installation instructions |
| q | When installing ensure that arrow points in direction of travel |
| 4 - | Brake light sensor |
| q | Fitting location: on brake pedal |
| q | Removing and installing → Chapter |
| q | Can be checked in „Guided Fault Finding“ using vehicle diagnostic, testing and information system -VAS 5051B- or -VAS 5052- |
| Can be re-installed if removed |
| 5 - | Brake pedal |
| q | With bracket for brake light sensor |
| q | Removing and installing; vehicles with manual gearbox → Chapter |
| q | Removing and installing; vehicles with automatic gearbox → Chapter |
| 6 - | Warning lamp for electromechanical parking brake |
| q | Fitting location: in speedometer |
| q | Lights up when parking brake is engaged and ignition is switched on, |
| q | Lights up for 20 seconds when parking brake is engaged and ignition is switched off, |
| q | Flashes when parking brake has been engaged if available braking force is not sufficient to prevent vehicle from rolling away |
| 7 - | Brake system warning lamp -K118- |
| q | Fitting location: in speedometer |
| q | Lights up together with ABS warning lamp if ABS should fail |
| q | Flashes if brake fluid level is too low |
| q | Flashes if there is a fault in the brake system |
| Press „SET button“ to display driver message with further information in instrument cluster |
| 8 - | Warning lamp for anti-lock brake system (ABS) -K47- |
| The warning lamp monitors the ABS and the electronic differential lock (EDL) |
| q | Fitting location: in speedometer |
| q | Lights up for a few seconds when the ignition is switched on and goes out after the automatic ABS self-test has been completed, providing no faults have been detected in the ABS. |
| q | There is a malfunction of the ABS if the warning lamp: |
| t | does not light up when the ignition is switched on, |
| t | does not go out again after a few seconds, |
| t | lights up while the vehicle is in motion. |
| q | Malfunctions in the ABS system do not influence the brake system itself. However, a change in braking behaviour must be reckoned with. |
| The electronic differential lock (EDL) operates in conjunction with the ABS. The ABS warning lamp will light up if a fault occurs in the EDL. |
| 9 - | ESP/ASR warning lamp (for electronic stabilisation program and traction control system) -K155- |
| q | Fitting location: in rev counter |
| q | Flashes when the vehicle is in motion and the ESP/TCS control is in operation |
| q | Lights up when the ignition is switched on and goes out after a short self-test has been completed |
| q | Lights up if there is a malfunction in the ESP |
| q | Lights up if there is a malfunction in the ABS, since the ESP works in conjunction with the ABS |
| q | Lights up when the traction control system (ASR) is switched off |
| q | Lights up during automatic self-adaption of the sensor systems when: |
| t | the battery has been disconnected and then re-connected |
| t | the vehicle has been jump-started |
| t | the battery charge level is very low |
| q | The ESP warning lamp goes out after the vehicle has been driven a short distance as soon as the automatic self-adaption of the sensor system is completed |
| 10 - | Front left speed sensor -G47- |
| q | Removing and installing → Chapter |
| q | Can be checked in „Guided Fault Finding“ using vehicle diagnostic, testing and information system -VAS 5051B- or -VAS 5052- |
| 11 - | Hydraulic unit -N55- with control unit -J104- |
| q | Removing and installing → Chapter |
| 12 - | Return ring |
| q | Removing and installing → Chapter |
| 13 - | Steering angle sender --G85-- |
| q | Fitting location: incorporated in return ring with slip ring on steering column → Rep. gr.69 |
| q | Removing and installing → Chapter |
| q | Performing zero compensation |
| Vehicle diagnosis and service information system -VAS 5051B- or -VAS 5052- |
| 14 - | Front right speed sensor -G45- |
| 15 - | TCS (ASR)/ESP button -E256- |
| q | Fitting location: in centre console |
| q | Switches traction control system (ASR) off and on |
| 16 - | Switch for Audi hold assist |
| q | Fitting location: in centre console |
| q | Function → Chapter |
| q | Removing and installing → Chapter |
| 17 - | Switch for electromechanical parking brake -F234- |
| q | Fitting location: in centre console |
| q | Removing and installing → Chapter |
| 18 - | Diagnostic socket |
| q | Fitting location: cover in driver's footwell |
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