1999 AUDI A4 brake

01-86

Function test and check for proper seal
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified value
Corrective action
18 Bridge
1 + 2,
7 + 37,
37 + 28
ABS return
flow pump -
V39-
Right front
traction
control
switch-over
valve -N166-
Right front
traction
control outlet
valve -N167- Repair Manual, Brake
System, Repair Group 47
- Connect VAG1310A
pressure gauge to front
RIGHT brake caliper
and bleed.
- Bridge terminals 55 +
28
Repair Manual, Brake System,
Repair Group 45
- ABS return flow pump
malfunctioning, replace ABS
hydraulic unit -N55-


Pressure
relief valve in
ABS hydraulic
unit -N55-
Right front
ABS outlet
valve -N100- - Switch on ignition for
max. 10 seconds and
switch off again.
Right front
traction control
switch-over
valve -N166-
switched ABS return
flow pump -
V39- runs Pressure on
pressure - Check right front traction control
switch-over valve -N166- and right
front traction control outlet valve -
N167- via resistance test test
steps 5 + 6. Replace ABS hydraulic
unit -N55- if malfunctioning.
Pa
ge 39 of 79 Read Measurin
g Value Block
(function 08
)
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01-87

Function test and check for proper seal
Test step
VAG
1598/20
sockets Test of
Test requirements
- Additional work
steps Specified value
Corrective action
18

Continuation:

Left rear
ABS
outlet
valve -
N136- - Bridge terminals 27
+ 28
- Switch on ignition for
max. 10 seconds and
switch off again.
Front Wheel Drive
(FWD):
170 25 bar
All-Wheel Drive
(AWD), pressure
regulation (ABS):
90 25 bar
Right front
traction control
outlet valve -
N167- switchedPressure
increases on
pressure
gauge:
- Pressure relief valve and/or right
front ABS outlet valve -N100-
and/or left rear ABS outlet valve -
N136- malfunctioning. Replace
ABS hydraulic unit -N55-.

- Remove VAG1310A
pressure gauge and
bleed brakes All Wheel Drive
(AWD), throttle
valve regulation:
170 25 bar

Pa
ge 41 of 79 Read Measurin
g Value Block
(function 08
)
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Repair Manual,
Brake System, Repair Group 47

Pa
ge 42 of 79 Read Measurin
g Value Block
(function 08
)
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e=re
pair&id=AUDI.B5.SU02.01.8

01-89

Function test: ABS warning light -K47-
Test step
VAG
1598/20
sockets Test of
Test
requirements
- Additional work
steps Specified value
Corrective action
19

Continuation: - Function of
ABS
warning
light -K47- - Switch on
ignition ABS warning
light -K47- lights
up for two (2)
seconds and
then goes out.
Electrical Wiring Diagrams,
Troubleshooting & Component Locations - If ABS warning light does not come on,
check voltage of electrical system and test
wiring from terminal 32 of ABS control
module -J104- to instrument cluster for
short circuit to Ground (GND).
- The ABS warning lamp does not switch
off after 2 seconds. The red "brake system
malfunction" symbol lights up after 2
seconds. Check wire from terminal 32 of
ABS control module -J104- to instrument
cluster for short circuit to B+ and open
circuit.

Repair Manual, Electrical Equipment,
Repair Group 90; Instrument cluster
- Are both the vehicle voltage and the
wiring from terminal 32 of ABS control
module -J104- to the instrument cluster
OK? Malfunction in instrument cluster. Pa
ge 44 of 79 Read Measurin
g Value Block
(function 08
)
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yp
e=re
pair&id=AUDI.B5.SU02.01.8

01-90

Function test: Red brake warning symbol
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified
value Corrective
action
20 - Function of red "brake
system malfunction"
symbol
Repair Manual, Brake System, Repair
Group 47

Brake fluid level is OK Function of ABS warning light -K47-
already checked in step 19. Multi-pin connector connected to ABS
control module -J104- and retainer
catch engaged. Switch on ignition
Test step 20: Continued on
next page.
Pa
ge 45 of 79 Read Measurin
g Value Block
(function 08
)
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e=re
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01-91

Function test: Red brake warning symbol
Test step
VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified value
Corrective action
20

Continuation: Function of red
"brake system
malfunction"
symbol - For vehicles with
automatic transmission and
high-line instrument cluster,
depress the brake pedal
and select a driving gear. The ABS/EDL indicator
lamp and the red "brake
system malfunction"
symbol light up. If the
traction control indicator
light is installed and OK, it
also lights up. Repair Manual,
Electrical Equipment, Repair Group 90; Instrument cluster
- Malfunction in
instrument cluster
Pa
ge 46 of 79 Read Measurin
g Value Block
(function 08
)
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01-97
Diagnostic Trouble Code (DTC) table

Notes:

Connect the VAG1551 Scan Tool (ST) and select address word 03 "Brake Electronics".
Check the control module version page 01
-52
and press the button.
Press buttons -0- and -2- to select "Check DTC Memory" function 02. Press -Q- button to confirm input.
Notes:
Each malfunction is assigned a 5-digit Diagnostic Trouble Code (DTC). The DTC is located in the left column of the DTC
table. If you have switched the printer on by pressing the "PRINT" button, the VAG1551 scan tool (ST) prints the message
identifying the malfunction and the DTC. Otherwise, DTCs are not displayed by the VAG1551 scan tool.
The contents of DTC memory remain stored until memory is erased, page 01
-15
.
Sporadically occurring malfunctions are identified via indication of "/SP" on the right-hand side of the display.
Static malfunctions that cannot be detected when the vehicle is stationary are also identified with "/SP" if the ignition has
been switched off and then on again.
The following DTC table includes all the DTCs that can be stored by the ABS control module -J104- and displayed and
printed out by the VAS5051 tester or VAG1551 scan tool. Malfunctions are listed by DTC number.
Pa
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g Value Block
(function 08
)
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01-103

Output on printer of
VAG1551 Scan Tool
(ST) Possible cause
Corrective action
DTC
00283
Left front ABS wheel
speed sensor -G47-
or:
ABS wheel speed sensor rotor dirty or
damaged.
Excessive wheel bearing play.
Left rear ABS wheel speed sensor -G47-
installed incorrectly.
ABS wheel speed sensor -G47-
malfunctioning.
Short circuit to Ground (GND). Repair Manual, Brake System, Repair Group 45

Repair Manual, Suspension, Wheels, Steering,
Repair Group 40

Repair Manual, Brake System, Repair Group 45
- Check rotor, clean or replace
- Replace wheel bearing- Check installation of ABS wheel speed sensor.- "Read measuring value block" display group 1
page 01
-63
.
- Carry out "Electrical test", step 7 page 01
-68
.
- If neither the "Read measuring value block"
function nor the "electrical test" reveal any
malfunctions, check all wiring and harness
connectors for loose contacts.
Left front ABS wheel
speed sensor -G47-
Incorrect control module version.- Check control module version page 01
-52
.
Pa
ge 58 of 79 Read Measurin
g Value Block
(function 08
)
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e=re
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