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Brake Question

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Old 01-05-2017, 10:15 AM
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2015 C300 4Matic
Brake Question
This morning when backing out of my garage, I lifted off the brake pedal and heard a hissing sound almost like the sound that is made when you squeeze a turkey baster. It did this consistently on my drive in to work every time I lifted off the brake pedal. Any thoughts as to what this could be? I have an appointment on Monday 1/9/17 for other issues (panoramic roof rattle & brakes constantly squeaking) Thanks!
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Old 01-05-2017, 10:34 AM
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CLS
Any change in apparent pedal pressure?
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Old 01-05-2017, 10:37 AM
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No change in brake pressure. They seem to be functioning ok, just wondering what could be wrong or if they are going to fail between now & Monday.
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Old 01-05-2017, 10:51 AM
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One can only speculate but I'd err on the side of caution. Park it.
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Old 01-05-2017, 11:23 AM
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i just noticed the hissing sound when you take pressure off the pedals yesterday.
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Old 01-05-2017, 04:18 PM
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Does it make any sounds when you press on the brake pedal?
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Old 01-05-2017, 04:19 PM
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No, no sounds when I press on the brake pedal, just when I release.
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Old 01-05-2017, 09:19 PM
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May be the rubber bellows on the brake pedal cylinder expanding / opening up.
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Old 01-06-2017, 11:29 AM
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my car does this, much much more evident in the cold, every car I've driven makes a sort of deflating noise when brake pedal is released though..
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Old 01-06-2017, 12:09 PM
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2016 C300 4Matic traded in for a 2022 E450 Coupe
Originally Posted by topsider
my car does this, much much more evident in the cold, every car I've driven makes a sort of deflating noise when brake pedal is released though..


+1
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