Abs/Electronic Stabilization Program (Esp) Overview, BOSCH
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The Bosch ESP 8.1 has the following functions:
- ABS - Antilock braking system
- ASR - Anti-slip regulation
- EBD - Electronic brake pressure distribution
- EDL - Electronic differential lock
- ESP - Electronic stabilization program
- FBS - Fading brake support
- HBA - Hydraulic brake assist
- MSR - Engine drag torque regulation
- Emergency braking signal
- Brake rotor cleaning
- Trailer stabilization
The brake system is distributed diagonally. The vacuum brake servo unit boosts the brakes pneumatically.
NOTE:
ABS malfunctions do not affect the brake system and the booster. Conventional brake system stays operative even without ABS. A change in braking behavior should be checked. When the ABS warning lamp comes on the rear wheels can lock-up early when braking!
Malfunction sources are reduced by direct connection of components named. The components are replaced instead of repaired.
- Right Rear ABS Wheel Speed Sensor -G44-
- Removing and Installing, refer to RIGHT REAR ABS WHEEL SPEED SENSOR -G44- AND LEFT REAR ABS WHEEL SPEED SENSOR -G46-
- Can be tested in "guided fault finding" with the vehicle diagnostic tester VAS 5051B or VAS 5052.
- Left Rear ABS Wheel Speed Sensor -G46-
- ESP-Sensor Unit -G419-
- Component location: under the left seat.
- Removing and Installing, refer to ESP SENSOR UNIT -G419- .
- 9 Nm
- Combined transverse acceleration sensor G200, rotation rate sensor G202 and longitudinal acceleration sensor G251.
- Can be tested in "guided fault finding" with the vehicle diagnostic tester.
- Observe installation instructions
- Check the arrow in the direction of travel when installing.
- Brake Lamp Sensor
- Component location: on brake pedal.
- Removing and Installing, refer to BRAKE LAMP SENSOR .
- Can be tested in "guided fault finding" with the vehicle diagnostic tester VAS 5051B or VAS 5052
Cannot be reused after removal.
- Brake Pedal
- With bracket for the brake lamp sensor.
- Removing and Installing, Manual Transmission, refer to BRAKE PEDAL, MANUAL TRANSMISSION .
- Removing and Installing, Automatic Transmission, refer to BRAKE PEDAL, AUTOMATIC TRANSMISSION .
- Electromechanical Parking Brake Indicator Lamp
- Located in the tachometer.
- Lights up when the parking brake is engaged and the ignition is switched on.
- Lights up for 20 seconds when the parking brake is engaged and the ignition is switched off.
- Blinks after engaging the parking brake if the brake pressure is not sufficient to prevent the vehicle from rolling.
- Brake System Indicator Lamp -K118-
- Located in the tachometer.
- Turns on with the ABS indicator lamp when the ABS system malfunctions.
- Blinks when the brake fluid is too low.
- Blinks when there is a malfunction in the brake system.NOTE:
The malfunction is indicated more precisely when the "SET button" in the instrument cluster is pressed.
- ABS Indicator Lamp -K47-NOTE:
The indicator lamp monitors the ABS and the Electronic Differential Lock (EDL).
- Component location: in the tachometer.
- Lights up for several seconds when ignition is switched on and goes out after an automatic ABS system self-check if there are no malfunctions in the ABS system.
- There is an ABS malfunction if the indicator light:
- Does not light up when ignition is switched on.
- Does not go out after a few seconds.
- Lights up while driving.
- ABS malfunctions have no effect on the brake system. However, a change in braking behavior should be checked.NOTE:
The Electronic Differential Lock (EDL) and ABS work together. The ABS indicator light lights up when the EDL malfunctions.
- ASR/ESP Indicator Lamp -K155-
- Component location: in the tachometer.
- Blinks when driving if ESP/ASR engages regularly.
- Comes on when ignition is switched on and goes out after a short self-check.
- Comes on if there is an ESP system malfunction.
- Comes on if there is an ABS system malfunction because ESP and ABS work together.
- Comes on when the ASR is switched off.
- Comes on during sensor programming if:
- The battery was disconnected and connected.
- Vehicle was started with jump start.
- The battery is too weak.
- After the sensor programming procedure, the ESP light goes out after driving a short distance.
- Left Front ABS Wheel Speed Sensor -G47-
- Removing and Installing, refer to RIGHT FRONT ABS WHEEL SPEED SENSOR -G45- AND LEFT FRONT ABS WHEEL SPEED SENSOR -G47- .
- Can be tested in "guided fault finding" with the vehicle diagnostic tester VAS 5051B or VAS 5052.
- ABS Hydraulic Unit with ABS Control Module -J104-
- Removing and Installing, refer to ABS HYDRAULIC UNIT -N55- WITH ABS CONTROL MODULE -J104- .
- Return Ring
- Removing and Installing, refer to STEERING ANGLE SENSOR -G85- .
- Steering Angle Sensor -G85-
- Component location: Installed in coil ring with slip ring on steering column.
- Removing and Installing, refer to STEERING ANGLE SENSOR -G85- .
- Perform zero adjustment, using the Vehicle diagnostic tester.
- Right Front ABS Wheel Speed Sensor -G45-
- ASR/ESP Button -E256-
- Component location: Inside center console.
- Switches the ASR off and on.
- Audi Hold Assist Pressure Switch
- Located in the center console.
- Function, refer to AUDI HOLD ASSIST .
- Removing and Installing, refer to AUDI HOLD ASSIST SWITCH .
- Parking Brake Pressure Switch -F234-
- Located in the center console.
- Removing and Installing, refer to PARKING BRAKE SWITCH -F321- .
- Diagnostic Connection
- Component location: cover in driver footwell.