Community Forums

tiderv · 10-10-2012, 09:29 AM

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.

Mike Canter · 10-10-2012, 03:13 PM

I don't think you are going to stop that compressor noise. On the race car Freightliner FL-70 tow truck with a 460 hp Mercedes diesel and the compressor noise is loud and can be heard and felt while driving down the road. On my mh with the Detroit it is a little quieter but I can still feel it and hear it but not as bad as the truck. The only other option is more sound insulation between the MH and the motor.

amanda_h · 10-10-2012, 05:43 PM

We agree with all that Mike has said. DH and I both drove transit buses at one time and one model the agency had at the time had extremely noisy compressor release. Not only was it distracting while driving but if one were standing outside next to the bus, you'd almost jump a out of your shoes when it unleashed. Many of the drivers complained about it and the mechanics were able to tone it down a bit but it was still louder than the ordinary bus chassis. The maintenance department told us that there was nothing else they could do and we had to put up with it and we did until they got rid of that model of coach.

Our Meridian (on a Freightliner CCC) is loud but not enough to really bother us.

tiderv · 10-10-2012, 06:24 PM

Thanks to all for the information. I am somewhat now used to the noise, but I still worry that something is going to lock up and take out all of the timing gears. I have put about 4K miles and nothing has happened so far and hearing what you guys have experienced makes me a lot more comfortable. I will keep going and see what happens.

Thanks, again

Macpeety · 11-18-2012, 09:15 AM

Quote:

Originally Posted by tiderv

Thanks to all for the information. I am somewhat now used to the noise, but I still worry that something is going to lock up and take out all of the timing gears. I have put about 4K miles and nothing has happened so far and hearing what you guys have experienced makes me a lot more comfortable. I will keep going and see what happens.

Thanks, again

All single stage compressors are loud. Put a 2 stage compressor on it and it will quieten down quit a bit.