Brake Air Compressor Noise
Hello everyone. I have a brake compressor noise that is driving me up the wall. I have a 2006 Phaeton, Cat C7, 350, 32K miles, with a Bendix brake compressor. The noise occurs while the compressor is building air and stops when the compressor unloads. The noise is loud enough that I can hear it over the normal engine noise. I just replaced the compressor with a new Cat compressor (not an inexpensive or easy job) and the noise is unchanged. I have had Freightliner and Cat listen to the noise and the only advice they gave is to to drive and ignore it.
Anyone else ever ran into this? Any help would be greatly appreciated.