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Brake Fluid Pump: Customer Interest
ABS Pump - Noise and Slight Brake Pedal Vibration

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.

Brakes and Traction Control > Antilock Brakes / Traction Control Systems > Brake Fluid Pump > Component Information > Technical Service Bulletins > Customer Interest for Brake Fluid Pump: > 459104

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