Knocking Noise When Parking
Thread Starter
Junior Member
Joined: Jul 2016
Posts: 20
Likes: 1
From: Denver, Colorado
2014 C300 Sport
Knocking Noise When Parking
Hey guys!
Just curious if anyone else hears a metal knocking noise when they put the car in park and release the brake? Its not loud, sounds like metal popping from expansion or something--not really sure how to describe it. If you've ever poured out hot water into a metal sink (cooking noodles, etc), it sounds like the sink does when the metal expands from the heat. I'm not sure where the sound comes from, sounds like underneath the car (so maybe it is just metal contracting after being hot while driving?).
It doesn't sound too concerning or loud, just wanted to see if anyone else hears this noise. Thanks for your help!
-Steven
Car:
C300 Sport, 2014
Just curious if anyone else hears a metal knocking noise when they put the car in park and release the brake? Its not loud, sounds like metal popping from expansion or something--not really sure how to describe it. If you've ever poured out hot water into a metal sink (cooking noodles, etc), it sounds like the sink does when the metal expands from the heat. I'm not sure where the sound comes from, sounds like underneath the car (so maybe it is just metal contracting after being hot while driving?).
It doesn't sound too concerning or loud, just wanted to see if anyone else hears this noise. Thanks for your help!
-Steven
Car:
C300 Sport, 2014
Junior Member
Joined: Nov 2014
Posts: 72
Likes: 3
From: Halifax, NS
2010 Mercedes-Benz C350 4Matic
I think it's just the sound when the pin dropped in the parking hock inside the transmission. Pretty normal, nothing to worry about. You can notice the car could be moving just a bit forward or downward, depending on the slope of the road. Of course, if you are on a very flat road, you won't be hear the pin dropped in and the car won't move at all.
http://myautomatictransmission.com/t...rking-pawl.htm
http://myautomatictransmission.com/t...rking-pawl.htm
Thread Starter
Junior Member
Joined: Jul 2016
Posts: 20
Likes: 1
From: Denver, Colorado
2014 C300 Sport
I think it's just the sound when the pin dropped in the parking hock inside the transmission. Pretty normal, nothing to worry about. You can notice the car could be moving just a bit forward or downward, depending on the slope of the road. Of course, if you are on a very flat road, you won't be hear the pin dropped in and the car won't move at all.
http://myautomatictransmission.com/t...rking-pawl.htm
http://myautomatictransmission.com/t...rking-pawl.htm
Super Member
Joined: Aug 2013
Posts: 709
Likes: 48
From: NFLD
2017 C43 AMG, 2010 C350 4Matic, 9 Motorcycles
I think it's just the sound when the pin dropped in the parking hock inside the transmission. Pretty normal, nothing to worry about. You can notice the car could be moving just a bit forward or downward, depending on the slope of the road. Of course, if you are on a very flat road, you won't be hear the pin dropped in and the car won't move at all.
http://myautomatictransmission.com/t...rking-pawl.htm
http://myautomatictransmission.com/t...rking-pawl.htm
Don't worry, perfectly normal.
I worried too as my MB is my first auto!
It's very normal and actually is a sign of proper operation! Now you know she's in park!! Hahaha.
