ABS ACTIVATES DURING LIGHT BRAKE APPLICATION
TECHNICAL SERVICE BULLETIN
Reference Number(s): GROUP 45, NO. 08-04 (2010096/3), Date of Issue: November 19, 2008
Superceded Bulletin(s): GROUP 45, NO. 05-01, Date of Issue: March 1, 2005
SERVICE INFORMATION
45 08 04 2010096/3 November 19, 2008. Supersedes Technical Service Bulletin Group 45
number 05-01 dated March 1, 2005.
APPLICABLE MODELS AND YEARS
CONDITION
ABS activates when braking lightly or control noises are heard from the ABS unit at low
speed without brake application.
TECHNICAL BACKGROUND
May be caused if an ABS control takes place without the flashing of the ESP lamp and
thus without ESP operation.
This is purely an ABS action.
The ESP sensors have no influence on this.
The following may be the cause for incorrect wheel speed values:
Damaged wires from the wheel speed sensor to the ABS control unit.
Tires of unequal size or greatly unevenly worn tires.
Slight cracks in the ABS rotors (especially on older vehicles).
Dirty or incorrectly adjusted wheel speed sensors.
PRODUCTION SOLUTION
-
SERVICE
AUDI: A4 1996 - 2001; A6 1998 - 2004; Allroad quattro 2000 - 2005; A8 1998 - 2002
GROUP: 45 - Anti-lock Brake System (ABS)
Model(s) Year VIN Range Vehicle-Specific Equipment
A4 1996 - 2001 All Not Applicable
A6 1998 - 2004 All
Allroad quattro 2000 - 2005 All
A8 1998 - 2002 All
2004 Audi A6 Quattro
ABS ACTIVATES DURING LIGHT BRAKE APPLICATION
2019年10月9日 17:1 12:4512 Page 1 © 2011 Mitchell Repair Information Company, LLC.
Do not replace any components until the following has been performed.
Tip: DTCs may not be stored in the ABS control module, and On-Board Diagnostic (OBD)
Read measuring value block 1 may not show any deviation in the wheel speed value.
1. Thoroughly check the ABS for any cracks, debris or damage to ensure proper
operation.
2. Using an oscilloscope (VAS 5051), check the wheel speed values.
Curve and frequency must be smooth and uninterrupted as shown in Fig. 1.
Fig. 1: Smooth Curve And Frequency
A short disruption (such as a scratch or a notch) in the curve of the DSO
picture that is repeated periodically may indicate a damaged ABS rotor. If a
short disruption is observed, inspect the ABS rotor for damage. The ABS rotor
may be located on the outer CV joint, the wheel hub, or the inside of the
brake disc. (See Repair manual: Group 45 - Anti-lock brake system) .
NOTE: Since slight cracks may be hard to detect with a naked eye, use an
oscilloscope.
2004 Audi A6 Quattro
ABS ACTIVATES DURING LIGHT BRAKE APPLICATION
2019年10月9日 17:12:42 Page 2 © 2011 Mitchell Repair Information Company, LLC.
Fig. 2: Short Disruption In Curve And Frequency Repeated Periodically
WARRANTY
This TSB is informational only and not applicable to any Audi warranty.
ADDITIONAL INFORMATION
All parts and service references provided in this TSB are subject to change and/or
removal. Always check with your Parts Department and service manuals for the latest
information.
2004 Audi A6 Quattro
ABS ACTIVATES DURING LIGHT BRAKE APPLICATION
2019年10月9日 17:12:42 Page 3 © 2011 Mitchell Repair Information Company, LLC.
TECHNICAL SERVICE BULLETIN
Reference Number(s): GROUP 45, NO. 08-04 (2010096/3), Date of Issue: November 19, 2008
Superceded Bulletin(s): GROUP 45, NO. 05-01, Date of Issue: March 1, 2005
SERVICE INFORMATION
45 08 04 2010096/3 November 19, 2008. Supersedes Technical Service Bulletin Group 45
number 05-01 dated March 1, 2005.
APPLICABLE MODELS AND YEARS
CONDITION
ABS activates when braking lightly or control noises are heard from the ABS unit at low
speed without brake application.
TECHNICAL BACKGROUND
May be caused if an ABS control takes place without the flashing of the ESP lamp and
thus without ESP operation.
This is purely an ABS action.
The ESP sensors have no influence on this.
The following may be the cause for incorrect wheel speed values:
Damaged wires from the wheel speed sensor to the ABS control unit.
Tires of unequal size or greatly unevenly worn tires.
Slight cracks in the ABS rotors (especially on older vehicles).
Dirty or incorrectly adjusted wheel speed sensors.
PRODUCTION SOLUTION
-
SERVICE
AUDI: A4 1996 - 2001; A6 1998 - 2004; Allroad quattro 2000 - 2005; A8 1998 - 2002
GROUP: 45 - Anti-lock Brake System (ABS)
Model(s) Year VIN Range Vehicle-Specific Equipment
A4 1996 - 2001 All Not Applicable
A6 1998 - 2004 All
Allroad quattro 2000 - 2005 All
A8 1998 - 2002 All
2004 Audi A6 Quattro
ABS ACTIVATES DURING LIGHT BRAKE APPLICATION
2019年10月9日 17:1 12:4512 Page 1 © 2011 Mitchell Repair Information Company, LLC.
Do not replace any components until the following has been performed.
Tip: DTCs may not be stored in the ABS control module, and On-Board Diagnostic (OBD)
Read measuring value block 1 may not show any deviation in the wheel speed value.
1. Thoroughly check the ABS for any cracks, debris or damage to ensure proper
operation.
2. Using an oscilloscope (VAS 5051), check the wheel speed values.
Curve and frequency must be smooth and uninterrupted as shown in Fig. 1.
Fig. 1: Smooth Curve And Frequency
A short disruption (such as a scratch or a notch) in the curve of the DSO
picture that is repeated periodically may indicate a damaged ABS rotor. If a
short disruption is observed, inspect the ABS rotor for damage. The ABS rotor
may be located on the outer CV joint, the wheel hub, or the inside of the
brake disc. (See Repair manual: Group 45 - Anti-lock brake system) .
NOTE: Since slight cracks may be hard to detect with a naked eye, use an
oscilloscope.
2004 Audi A6 Quattro
ABS ACTIVATES DURING LIGHT BRAKE APPLICATION
2019年10月9日 17:12:42 Page 2 © 2011 Mitchell Repair Information Company, LLC.
Fig. 2: Short Disruption In Curve And Frequency Repeated Periodically
WARRANTY
This TSB is informational only and not applicable to any Audi warranty.
ADDITIONAL INFORMATION
All parts and service references provided in this TSB are subject to change and/or
removal. Always check with your Parts Department and service manuals for the latest
information.
2004 Audi A6 Quattro
ABS ACTIVATES DURING LIGHT BRAKE APPLICATION
2019年10月9日 17:12:42 Page 3 © 2011 Mitchell Repair Information Company, LLC.
