View Full Version : Loud humming in rear mainly at high speeds ?

10-03-2011, 06:52 PM
hello, the other day I drove about two hours on the highway at about 90 mph consistently, and as i pick up speed there is a consistent loud hum coming from the trunk/ rear wheel area. It gets unnecessarily loud and it gets hard to hear my passengers. i searched and found that this may be a rear axle? That sound about right? Thanks in advance

10-03-2011, 07:03 PM
Does it sound like there's a helicopter landing in your back seat?

10-03-2011, 07:36 PM
Probably just a wheel bearing, see if it's louder on one side.

10-03-2011, 07:48 PM
Maybe a wheel bearing.
Can also be your rear-differential [check the oil; change if necessary].
How are your tires?

10-03-2011, 07:53 PM
The tires are relatively brand new, about 10000 miles on them. it doesn't really sound like a helicopter is landing in the rear seats, just very loud humming, and I would also say that it is louder on the drivers rear wheel. That's where it seems like its coming from, but I tried to make a video of it but my camera wasn't really picking up the sound effectively..

10-03-2011, 08:15 PM
I would also say its the Wheel Bearing.

10-03-2011, 09:14 PM
Yeah, sounds like a wheel bearing.

10-04-2011, 10:43 AM
Thanks for the replies, is this relatively easy to fix? Or should I just bring it to an audi tech?

ECS Tuning-Audi
10-04-2011, 11:02 AM
Rear wheel bearings on the B5 require the bearing to be pressed in and out. The bearing its self is relatively inexpensive. I would suggest removing the rear upright and taking it to a shop to have the old bearing pressed out and the new one pressed it. Most shops will to it for under 100 bucks.

We have rear wheel bearings available below.

Click HERE to order or for more information. (http://www.ecstuning.com/Audi-B5_A4-Quattro-1.8T/Search/ES261808_ES2215420_ES1488_ES430010/?salesrep=JMarusic&utm_source=audizine&utm_medium=forum&utm_content=JMarusic&utm_campaign=postreply)
http://c1552172.r72.cf0.rackcdn.com/145059_x600.jpg (http://www.ecstuning.com/Audi-B5_A4-Quattro-1.8T/Search/ES261808_ES2215420_ES1488_ES430010/?salesrep=JMarusic&utm_source=audizine&utm_medium=forum&utm_content=JMarusic&utm_campaign=postreply)
Let me know if you have any other questions.


10-04-2011, 11:37 AM
What Jason said.

I took my rear upright off and the shop charged me $30 to press the old bearing out and press the new bearing in. Make sure you get a new axle bolt as they are one time use bolts.

10-04-2011, 12:05 PM
Semi-related note...if it did sound like a helicopter landing in my back seat with new tires...? [>_>]