ABS Pump - Noise and Slight Brake Pedal Vibration

9208audi01

Group: 45

Number: 91-04

Date: 11/30/91


Subject:

Weak Signal From Wheel Speed Sensor Causes ABS Return Pump To Come On At Speeds Below 20 MPH/30KH


Model(s): All With ABS


(This Technical Bulletin Supersedes Technical Bulletin, Group 45, Number 91-03 Dated 10/31/91)

Condition:

- Driver notices ABS pump noise and slight brake pedal vibration.

- Weak signal from one wheel speed sensor.


Production:

Improvement of assembly at supplier. From 05.89, Chassis No. 8A_LA001000
8B_LA000600
44_LN001500


Service:

Check wheel speed sensor.

- Check correct fitting of wheel speed sensor (final stop).

- Measure the inner resistance of the sensor according to test step 10 ABS Fault Finding. Move the sensor cable during this test
to determine if poor connection is present.