Question about 1999 Volkswagen Passat
Hiya. we have just had a passat in for mot which failed on 2 front cv boots, a collegue repaired them but now there is a fault with the abs, it only happens at low speed when braking very lightly, i have removed both drive shafts and inspected the abs rings and also the sensors which all look fine. also scanned the system for faults but there were no codes present also all sensors were fine, can you shed any light on this.
After taking the car back to our most excellent garage they quickly diagnosed the fault with the ABS. It was to do with the gap between the sensor and the wheel - it has to be a very precise distance and was disturbed by the changing of the CV boot (seems to be a common problem).
Half hour later and it is as good as new - this was after lots of electronic testing etc. - the clue was that it didn't give any registered fault on the diagnostic computer.
Hope this helps you Saxoste
Posted on Feb 18, 2009
Hello, What may have happened is that the airgap on the sensor is too great from what you guys are explaining. Is there a abs light on? I would go under the car and push in the sensor located on the knuckle/spindle assy till it bottoms out. What usually happens is inexperienced independent shops push the sensor out by accident or end up damaging the sensor on the outer cv joint costing some major $$ down the road. Sometimes cheap labor is not always the best.
Posted on Feb 17, 2009
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Posted on Jan 02, 2017
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