brake AUDI A4 1998 B5 / 1.G Brakes Basic Setting 04 Workshop Manual

01-248

Hydraulic system, bleeding

The hydraulic pump for traction control -V156- is
activated to bleed the hydraulic system.

Repair manual, Brake System, Repair Group
47


- Connect VAS5051 tester or VAG1551 scan tool
and select the address word 03 "Brake
Electronics". Rapid data transfer
HELP
Select function XX

Indicated on display:
- Press buttons -0- and -4- to select function 04 "Basic Setting"
Rapid data transfer
Q
04 - Basic Settin
g

Indicated on display:
- Press -Q- button to confirm input.
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01-250

ESP driving and system test

The ESP driving test is used to test the
plausibility of the signals from the sensor for
transverse acceleration, yaw sensor, and
pressure sensor.

Road test vehicle
Some DTCs are only recognized by the On
Board Diagnostic (OBD)while the vehicle is
moving. You can check the entire system during
a road test. During road test, drive at a speed of
at least 60 km/h for 30 seconds. Check traffic
conditions and perform an ABS regulated braking
when appropriate. You will feel a pulsing in the
brake pedal indicating the system is active.

Note:
Once the ESP driving test has been initiated, it
cannot be aborted and must be performed
completely. After exiting the diagnostic, the
ABS/EDL and ASR/ESP lamps remain switched
on in order to indicate that the test is active and
that system function is not available yet.
Warning, ABS and ESP not functioning!
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01-251

WARNING!

While system is in diagnostic, the
ABS/ESP/EBD is not active. Driving the
vehicle after On Board Diagnostic (OBD) has
detected a malfunction presents the risk of
accident. The brake system will only be
partially functional. Because brake pressure
at the rear wheels is no longer regulated vie
Electronic Brake Distribution (EBD), the rear
wheels tend to brake excessively. This
causes the rear of the vehicle to break loose.

When the use of test equipment is required
during road tests, test equipment must
always be secured to the rear seat and
operated from there by a second person. If
test and measuring equipment is operated
from the passenger seat, the person seated
there could be injured in the event of an
accident involving deployment of the
passenger-side airbag.
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01-252

- Connect VAS5051 tester or VAG1551 scan tool
and select the address word 03 "Brake
Electronics" page 01
-4
Rapid data transfer
HELP
Select function XX

Indicated on display:
- Press buttons -0- and -4- to select function 04 "Basic Setting"
Rapid data transfer
Q
04 - Basic Settin
g

Indicated on display:
- Press -Q- button to confirm input.
Basic Setting
Q
Enter displa
y group number XXX

Indicated on display:
- Press buttons -0-, -0-, and -3-. Press -Q- button to confirm input.
System in basic setting
3
System test activated
OK

Indicated on display:
The ESP driving test is activated.
The ABS warning light -K47- and the traction control indicator light -
K86- go on.
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01-253

- Press buttons -0- and -6- to select "End Output"
function 06. Press -Q- button to confirm input. Rapid data transfer
HELP
Select function XX

Indicated on display:
Note:
This completes the adjustment with the engine not running
WARNING!
Always follow the rules of the road and pay attention to traffic
conditions as your first priority. - Disconnect VAG 1551 scan tool.
- Start engine.
- Press the brake pedal hard (brake pressure higher than 35 bar) until
the traction control indicator light -K86- turns off.
- Perform the following road test:
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01-256

Read Measuring Value Block (function
08)

The control module can transmit measured
values to the VAS5051 tester and VAG1551
Scan Tool (ST). These measured values provide
information about the operational status of the
system and the sensors connected to it. In many
cases the data supplied can be used to
troubleshoot and repair malfunctions. The
measured values provided by ESP are contained
in six display groups, which can be accessed via
their display group numbers.

- Connect the VAS5051 tester or VAG1551 Scan
Tool (ST) and select the address word 03 "Brake
Electronics".
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01-258
Test table: display group 1
Notes:

Display fields 1 through 4 show the current wheel circumference speeds in km/h. These are calculated by the ABS control
module -J104- on the basis of the signals received from the wheel speed sensors. If one of the display fields shows no
reading, proceed as for DTCs 00283, 00285, 00287, 00290 "ABS Wheel Speed Sensor" DTC table page 01
-357
.
In order to check whether wheel speed sensors are properly allocated to each wheel, the vehicle must be raised. On
vehicles with manual transmission put the gear shift lever in neutral. On vehicles with automatic transmission move the
selector lever to position "N". Turn appropriate wheel by hand. Remaining drive wheels must be secured against turning.
When a vehicle is accelerated uniformly on a dry surface, the displayed value will increase continuously by whole
numbers; e.g. 6 km/h, 7 km/h, 8 km/h ... . The difference between displayed values 1-4 should not be more than 1 km/h
(error from out-of-round wheels). If the values jump, for instance from ...6km/h, 7 km/h, to 12 km/h...or if the difference
between the displayed values is greater than 1 km/h, then check the installation of the wheel speed sensors and rotors. Repair Manual, Brake System, Repair Group 45

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01-261
Test table: display group 2 Read measuring value block
2
Indicated on display

0 or
operated 0 or
operated
0 or
operated 0 or
operated


Traction control button
0 Traction control button not operated Traction control switch operated
- Check traction control button if there are deviations. Carry out "Electrical test", step 20.

Parking brake

0 Parking brake not engaged Parking brake engaged
- Check parking brake warning light switch -F9- if
there are deviations. Carry out "Electrical test", step
27.

Brake light switch:
0 Brake pedal not depressedBrake pedal depressed- Check brake light switch if there are deviations. DTC table page
01
-356
; DTC "Brake light switch -F-"; DTC 00526.
Brake test switch:

0 Brake pedal not
depressed Brake pedal depressed
- The brake test signal precedes the brake light signal. Check brake light switch if there
are deviations:DTC table page 01
-356
; DTC "Brake light switch -F-"; DTC 00526.
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01-267
Test table: display group 4 Read measuring value block
4
Indicated on display
00:00 h
or
invalid Off/on
not
used not
used





EDL shut-off

Electronic Differential Lock (EDL) is deactivated at excessive brake temperature (only EDL).
Standing time (TIM):

The standing time (TIM) is used to calculate how much the brakes have cooled while the ignition is off. The ABS control
module -J104- receives the standing time signal from the instrument cluster.
- If nothing is displayed, press -C- button, select function 02 and check DTC memory. Repair the malfunction with the help
of the DTC table page 01
-356
.
Invalid:

Battery disconnected or completely discharged
Open circuit in wire from ABS control module (w/EDL) -J104- to instrument cluster
Note:
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01-270
Test table: display group 5 Read measuring value
block 5
Indicated on display
- 720
...
+720
- 69
/s ...
+ 69 /s
- 41
bar ...
+292
bar - 25 m/s2 ...
+ 25 m/s2


Transverse acceleration:

Specification with vehicle at standstill: 0....0.7 m/s2 Specification with steering wheel fully turned at a speed of 20 km/h: max. 6.0 m/s2; the
value of the measured value increases steadily. Another test for the sensor is located page 01
-271
; Fig. 1
.

Brake pressure:

Specification with brake pedal not depressed: 0....5 bar

Rotation rate:
Specification with vehicle at standstill: 3 /sSpecification with steering wheel fully turned at a vehicle speed of 20 km/h: max. 65 /s; the value of the
measured value increases steadily.
Steering angle:

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