lock AUDI A4 1998 B5 / 1.G Brakes Description Of Systems Workshop Manual

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Description of systems

The individual components have the
following functions:

ABS

Anti-lock Brake System
ABS prevents the wheel from locking up during
hard braking initiated by the driver. Despite high
brake effectiveness, lane stability and steering
capacity are maintained.
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EDL

Electronic Differential Lock
The Electronic Differential Lock (EDL) is a
traction control aid for driving away from a
standstill. An electronically-controlled brake
application at the wheel that is spinning provides
a torque reaction point for the differential. This
enables the wheel with better traction to make
use of the engine power. EDL is effective in both
forward and reverse.
EDL is part of the basic configuration of vehicles
with All Wheel Drive (AWD). Although EDL only
regulates the front wheels on vehicles with Front
Wheel Drive (FWD), EDL regulates all four
wheels on vehicles with All Wheel Drive (AWD).
This makes it possible to eliminate the driver
operated mechanical differential lock.
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When ignition is switched off, the temperature
calculated for the hot brakes is stored until
ignition is switched on again. When ignition is
switched on, the instrument cluster transmits a
time signal so that the ABS control module
(w/EDL) -J104- can calculate the standing time.
This standing time is required by the temperature
algorithm for calculation of the new brake
temperature. If the indicated standing time
exceeds one hour, the brake temperature is
automatically set to the lowest temperature in the
temperature algorithm.
EDL shut-off for temperature reasons is indicated
in the measuring value block for a period of 20
ignition cycles.
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