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

01-40
Onset of EDL regulation is permitted up to a
speed of 40 km/h. The upper switch-off barrier
for already active EDL is 40 km/h for vehicles
with Front Wheel Drive (FWD), but 80 km/h for
vehicles with All Wheel Drive (AWD).
The hydraulic unit is equipped with suction
dampers. They improve pressure build-up in the
appropriate brake cylinders during EDL
regulation. The functional range of the pressure
relief valve in the hydraulic unit is 170 25 bar. To reduce the risk of brake overheating, EDL
regulation is not permitted above a specific brake
temperature. The temperature limit is defined in
the ABS control module (w/EDL) -J104-. The
control module determines the actual brake
temperature via an algorithm. If the algorithm
determines that the brakes have reached a
temperature below the temperature limit, the EDL
system becomes effective again. Function of the
vehicle brake system and ABS are not affected
by intervention in this system.
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01-41
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.
Pa
ge 7 of 10 Descri
ption of s
ystems
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.4