E350 Mystery Uh Oh Sound when brake pedal depressed
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Joined: Mar 2016
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2014 E350
E350 Mystery Uh Oh Sound when brake pedal depressed
My 2014 E350 is making an odd sound when breaking. I have been to the dealer. They said everything is fine. I have done the 50 to 0 fast breaking several times to clean any glazing. When the car has warmed up and been driven for awhile, the brakes make a two tone flute like sound (like an Uh Oh) when the brake pedal is depressed (from start of pressing pedal to about half way). The sound is coming from under the steering wheel. There is no sound outside the car (we checked). I can get the sound to stop if I pump the breaks a few times. It then comes back after driving and braking a few more times. The sound is not like screeching worn pads. It sounds more hydraulic in nature - like pressure is being released or a piston is letting off steam. I can actually make the tone oscillate up and down by adjusting pressure on the brake pedal. Has anyone experienced this?
Out Of Control!!
Joined: Jun 2004
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2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
My 2014 E350 is making an odd sound when breaking. I have been to the dealer. They said everything is fine. I have done the 50 to 0 fast breaking several times to clean any glazing. When the car has warmed up and been driven for awhile, the brakes make a two tone flute like sound (like an Uh Oh) when the brake pedal is depressed (from start of pressing pedal to about half way). The sound is coming from under the steering wheel. There is no sound outside the car (we checked). I can get the sound to stop if I pump the breaks a few times. It then comes back after driving and braking a few more times. The sound is not like screeching worn pads. It sounds more hydraulic in nature - like pressure is being released or a piston is letting off steam. I can actually make the tone oscillate up and down by adjusting pressure on the brake pedal. Has anyone experienced this?
Thread Starter
Junior Member
Joined: Mar 2016
Posts: 17
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2014 E350
Interestingly, I ran the car last night and turned off the eco drive. The braking sound stopped. What would be connected to the brake pedal as part of the Eco start stop that could be making the noise?
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Joined: Jul 2020
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w212
I think i have the same problem.
I will really appreciate if you could have a look at this two videos and tell me if its a similar noise.
I'm a bit desperate because i can't find a mechanic which could figure it out what's wrong with the car.
https://vimeo.com/440024147
https://vimeo.com/440051110
https://vimeo.com/440051262
https://vimeo.com/440051193
I'm a bit desperate because i can't find a mechanic which could figure it out what's wrong with the car.
https://vimeo.com/440024147
https://vimeo.com/440051110
https://vimeo.com/440051262
https://vimeo.com/440051193
Last edited by Olympuss; Jul 20, 2020 at 01:43 PM.
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