Quote:
Originally Posted by Henn28
There is an eBay guy who sells a rebuild kit to the pump, if it turns out to be that. New ones are expensive.
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I just bought
this kit for the original pump from my '04 with 4 corner air. The rebuild kit is the same for 2 or 4 corner, but the part is different- be sure to order the correct replacement pump for your suspension.
The rebuild is easy with plenty of pdf's and videos about how to install it. We just got the SLS error again last week in the 4.8. It is apparently the pump. So, my plan *was* to take the existing pump from the 4.8, rebuild it, and then install it into the 4.4- which has started a nice subtle lean to one side. There are no errors yet. We have never replaced the pump on the 4.4 with 60k miles. We used to be able to hear it whirring back there. Since we don't hear it any more, my thought is that the pump will need a rebuild soon enough.
Unfortunately, the wires in my 4.8 pump that I replaced a 5-6 years ago are fried. It appears that the pump got very hot and affected the wires. (See pics). Some of the insulation is off as well as a few hotspots on the wire. Not gonna use it again.
So, my plan is to buy a used Wabco 4 corner pump from eBay- they're everywhere and from ~$150 up. I will then rebuild that one for the 4.4. There are cheap units that are new and not OEM/Wabco, but I don't trust them. This is gonna be an expensive month for BMW ownership.
