I wanted to let you all know that I did remove front calipers and rotors on my 2001 silv. 2500 HD that we discussed earlier last week. And as my sons friend told me I removed the sensors located behind the rotor held in by 1 allen bolt. I cleaned the corrosion out from under the sensor and also cleaned the tip of the sensor by very lightly sanding metal surfaces. The driver side had no shims under it but the passenger side had 5 at variuos thicknesses, however it amounted to about six thousanths in all. If you were to remove and not replace even one of them the gear that these sense would hit the sensor. Any way once all shims were cleaned and the metal surface sanded clean everything was reinstalled.

This was on Thursday evening about 1.5 hours and as of today the 25th the problem has been solved.

GAT

I wanted to let you all know that I did remove front calipers and rotors on my 2001 silv. 2500 HD that we discussed earlier last week. And as my sons friend told me I removed the sensors located behind the rotor held in by 1 allen bolt. I cleaned the corrosion out from under the sensor and also cleaned the tip of the sensor by very lightly sanding metal surfaces. The driver side had no shims under it but the passenger side had 5 at variuos thicknesses, however it amounted to about six thousanths in all. If you were to remove and not replace even one of them the gear that these sense would hit the sensor. Any way once all shims were cleaned and the metal surface sanded clean everything was reinstalled.

This was on Thursday evening about 1.5 hours and as of today the 25th the problem has been solved.

GAT

1. i am very glad it was fixed fairly easily.
2. why exactly did you have shims (between sensor and hub, i assume)?
i'd appreciate explanation, i like collecting all kinds of know-how, one never knows. sounds like you had 2 different sensors installed, one being longer than the other.

1. i am very glad it was fixed fairly easily.
2. why exactly did you have shims (between sensor and hub, i assume)?
i'd appreciate explanation, i like collecting all kinds of know-how, one never knows. sounds like you had 2 different sensors installed, one being longer than the other.

That is a great question, when I spoke with someone else about that he told me that the hub casting has a tolerance as does the sensor and the gear that the sensor senses...when you start piling up tolerances you will get variance like this. These shims simply compensate for teh tolerances.

This was great conversation I hope this helps the next guy down the road.

GAT

That is a great question, when I spoke with someone else about that he told me that the hub casting has a tolerance as does the sensor and the gear that the sensor senses...when you start piling up tolerances you will get variance like this. These shims simply compensate for teh tolerances.

This was great conversation I hope this helps the next guy down the road.

GAT


your repair is what I expected as this is a recall and this is a repair I have done...


I hope that you applied a rust inhibitor on this cleaned surface as in the recall details it specifies that this is to prevent future rust ...



the most important part is not to get the debris into the hole ..

your repair is what I expected as this is a recall and this is a repair I have done...


I hope that you applied a rust inhibitor on this cleaned surface as in the recall details it specifies that this is to prevent future rust ...



the most important part is not to get the debris into the hole ..

Yes I did, I also did not remove the sensor bolt until it was thouroughly cleaned. We used Carb cleaner and a paint brush to scrub the area free of any thing that could have fallen in the hole during the dis-assembly process and the re-assembly process.

That is a great question, when I spoke with someone else about that he told me that the hub casting has a tolerance as does the sensor and the gear that the sensor senses...when you start piling up tolerances you will get variance like this. These shims simply compensate for teh tolerances.

This was great conversation I hope this helps the next guy down the road.

GAT

makes sense. so to speak. as i worked for quite some time as tool/die maker(thus tolerances and clearances were my middle initial), and am just shaking my head in disbelief - tolerance on a vital vehicle part so large that it has to be shimmed? are we still in 1890s? oh the GM love with shims!!

anyways, indeed, it was great post and valuable for many others. good times!

makes sense. so to speak. as i worked for quite some time as tool/die maker(thus tolerances and clearances were my middle initial), and am just shaking my head in disbelief - tolerance on a vital vehicle part so large that it has to be shimmed? are we still in 1890s? oh the GM love with shims!!

anyways, indeed, it was great post and valuable for many others. good times!

Very good comment on GM'S tolerance issues. It's funny to think how many problems lie in wait on our trucks that they (GM) know about because of stuff just like this. My truck like so many others have followed the path of what they call normal for a GM truck. Wheel bearings being one, the sensor issues being another, tail gate straps (twice) and the list goes on. But I have faith in my Country I know sooner or later our automotive industries will do the right thing and get back on track.

Until next time later all!

GAT