Hissing noise from brake pedal? - AudiWorld Forums

Go Back  AudiWorld Forums > Audi Models > Audi A4 > A4 (B7 Platform) Discussion
Reload this Page > Hissing noise from brake pedal?
Notices
A4 (B7 Platform) Discussion Discussion forum for the B7 Audi A4 produced from 2005-2008.5
Sponsored by:
Sponsored by:

Hissing noise from brake pedal?

Reply

 
 
Old 05-01-2012, 11:00 AM
  #1
Audiworld Junior Member
Thread Starter
 
Join Date: May 2005
Posts: 14
Default Hissing noise from brake pedal?

2006 A4 2.0tq auto. I've noticed lately that there seems to be a noise coming from the brake pedal, when I'm NOT stepping on the brakes. It's enough that I can hear it when driving around at less than highway speeds.

It sounds like a hissing noise. If I press the brake pedal down a bit, it stops then slowly comes back. If I press the pedal down more (full stop) the noise goes away until I let off the pedal.

Anyone heard of this? Know what it is? Recall (please be a recall).

Thanks in advance.
blisteringft is offline  
Reply With Quote
Old 05-09-2012, 10:11 AM
  #2
Audiworld Junior Member
Thread Starter
 
Join Date: May 2005
Posts: 14
Default Updated

Welp, I know we're all really interested in this, so here's an update.

Did some research (youtube) and found some steps to take to see if there is a vacuum leak in the brake booster or somewhere between it and the brake pedal.

Ran the car for a bit, pulled into the garage. Put it in park, foot off the brake, turn car off. Hissing noise tapered down for about 5 seconds to nothing. Wait 2 minutes, then test.

The test is to press the pedal down with the car off for 2 or more minutes. If there is a leak, the vacuum will have leaked and you'll feel little to no assist pushing the pedal. If the vacuum is good, you'll get 2 assisted pedal pushes.

I got 2 pushes no problem, even got some assistance on the 3rd push. So it seems there's not really a leak there.

Any thoughts as to what can make a hissing noise down there that stops when pushing the brake pedal in? I actually stuck my head down there while it was running and it seem like the noise is coming from behind/within that little rubber plunger. What is that?
blisteringft is offline  
Reply With Quote
 
 
 

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
N'Syncro
Parts For Sale
19
08-30-2017 07:16 AM
TBone2k
S4 (B8 Platform) Discussion
4
09-13-2015 04:39 PM
ZPA117
A4 (B8 Platform) Discussion
4
09-08-2015 11:55 AM
LaserSVT
A6 / S6 (C5 Platform) Discussion
6
09-05-2015 08:40 PM
zhaoweitian
A7
2
09-01-2015 03:15 PM


Thread Tools
Search this Thread
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -8. The time now is 04:27 PM.


 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: