Weird noise. Please help. (Already searched forum).
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Newbie
Joined: Sep 2019
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2012 Glk 350
Weird noise. Please help. (Already searched forum).
Thanks all in advance for your help. I went through the forums and I am confused.
My 2012 Glk 350 makes a high pitch "chirping/whirring" sound. (not a break squeak but more like a fan chirp) that has been reported as an a/c bearing or heater fan problem.
Thing is my glk makes that sound regardless if my heat or a/c is on or not and it only happens when I break.
If it was the sound that squeaky breaks make (had it before on this car), then I wouldn't be so confused. However, this has a sound similar to a computer cpu fan going bad, and it only happens when I break, and also happens when my heat/ac is off.
Any help would be appreciated.
Thank you.
My 2012 Glk 350 makes a high pitch "chirping/whirring" sound. (not a break squeak but more like a fan chirp) that has been reported as an a/c bearing or heater fan problem.
Thing is my glk makes that sound regardless if my heat or a/c is on or not and it only happens when I break.
If it was the sound that squeaky breaks make (had it before on this car), then I wouldn't be so confused. However, this has a sound similar to a computer cpu fan going bad, and it only happens when I break, and also happens when my heat/ac is off.
Any help would be appreciated.
Thank you.
Last edited by markcedes; Oct 24, 2019 at 12:50 AM.
Member
Joined: Mar 2003
Posts: 188
Likes: 78
From: Toronto, Canada
GLC300 (mine) GLK250 (wife's)
If the sound only happens when you brake then it is very likely to be brake-related but you seem certain that it is not the usual brake squeal. Have you checked for small stones or other debris wedged near your pads/rotors. Maybe a dust shield has been bent close to a rotor?
MBWorld Fanatic!
Joined: Sep 2015
Posts: 2,585
Likes: 343
2013 glk 350
Get your brakes looked at, the fronts wear first and there is only one sensor on the right wheel , if that sensor is bad you won’t know when you need brakes. I had that issue and didn’t know till I was metal on metal.
Thread Starter
Newbie
Joined: Sep 2019
Posts: 8
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2012 Glk 350
Thanks for the replies guys. After doing it for a few days, today it decided not to do it. Maybe it was something stuck that got dislodged? I have an appointment tomorrow to get my B service done at the Benz dealer. I'm guessing they check the breaks during this, but I'll be sure to ask them to do so.
Super Member
Joined: Aug 2011
Posts: 861
Likes: 38
From: Philly area
350 GLK, C280
May have something to do with the system that increases brake pressure when the vehicle thinks you need to stop faster. Same system that modulates the antilocks. I believe there is a secondary motor in that system to increase the brake pressure. Also could be from the vacuum brake booster vent.
