reverse + brakes = thump sound

skimo · 01-06-2009, 11:00 PM

So I just got my car back from service. There was a squeeking noise coming from the back right wheel. They said it was the braek sensor - fixed it under warranty.

But..

Now, when I go in reverse then apply the brakes..i hear a "thump" sound. Then when I go forward and apply the brakes I get another thump...if I apply the brakes twice I dont get the thump another time. I only get the thump the first time I apply the breaks going in a certain direction.

like the brakes are loose or something?? Anyone experience this?

Thanks in advance...
skimo

update: got car back from dealership. They said the sound was normal and due to the Break Assist Feature. Surprisingly, when I got the car back, the sound had gone away! They did do a transmission job where a bunch of components were changed (6mt). So maybe that was the transmission! Just speculating.

2kaccordocoupe · 01-06-2009, 11:04 PM

sounds like the pad could be loose or not sitting right

mmm def · 01-07-2009, 06:56 AM

My car does that every time i switch direction, it's more of a click on mine. I say normal, my Honda Fit does it too.

dxb335d · 01-07-2009, 07:05 AM

Mine does it too, done it for months.

On an incline or on level ground for you?

We all get it on an incline as the pin comes out, but mine also does iton the flat.

carrabassett786 · 01-07-2009, 07:47 AM

Quote:

Originally Posted by skimo

So I just got my car back from service. There was a squeeking noise coming from the back right wheel. They said it was the braek sensor - fixed it under warranty.

But..

Now, when I go in reverse then apply the brakes..i hear a "thump" sound. Then when I go forward and apply the brakes I get another thump...if I apply the brakes twice I dont get the thump another time. I only get the thump the first time I apply the breaks going in a certain direction.

like the brakes are loose or something?? Anyone experience this?

Thanks in advance...
skimo

I had the same thing less the brake thump (that I've noticed) They said it was my backing plate. (was ticking, too...)

SUperfunkMF · 01-07-2009, 10:51 AM

Mine does it too. Seems normal as far as I can tell.

archeroc · 01-07-2009, 10:54 AM

Are you using the emergency brake. Had that happen with a car about 15 years ago. For that car the emergency brake was looking up and the clunk was the releasing of the brake. The problem was misdiagnosed ended up cost $2,000 to fix.

joec500 · 01-07-2009, 11:27 AM

Mine does that too and so did my B7 Audi A4

E90330iS · 01-07-2009, 03:58 PM

Sounds like the transmission just switched gears... normal?

RambleJ · 01-07-2009, 04:01 PM

Mine did that too for a while.. then I realized it was something sliding around in my trunk!

JO3 · 01-07-2009, 10:37 PM

It's normal. It's a characteristic of floating calipers. Basically what's happening is when you are moving forward and apply the brake, the pad shifts to one side of the caliper. When you go in reverse and apply the brake, the pad shifts to the other side of the caliper. That's why you only hear the clunk once, after you change direction.

GordonShumway · 01-07-2009, 11:26 PM

Quote:

Originally Posted by skimo

So I just got my car back from service. There was a squeeking noise coming from the back right wheel. They said it was the braek sensor - fixed it under warranty.

But..

Now, when I go in reverse then apply the brakes..i hear a "thump" sound. Then when I go forward and apply the brakes I get another thump...if I apply the brakes twice I dont get the thump another time. I only get the thump the first time I apply the breaks going in a certain direction.

like the brakes are loose or something?? Anyone experience this?

Thanks in advance...
skimo

are you sure your not running over the cat ?

holson · 01-08-2009, 12:52 PM

mine does this too and sometimes when im just applying the brakes at slow speeds (bumper to bumper city traffic comes to mind).

dealer looked at it and said it's normal... ok then

skimo · 01-08-2009, 11:05 PM

thanks for the input guys....but this is a really loud "clunk"...actually people in the car today noticed and thought I hit something going in reverse!!

I told them no "its normal"...then a few seconds later told myself what am I thinking...this must be checked...i will let you know what the dealer says..

Thanks!

SpectreMech · 01-09-2009, 03:46 AM

Skimo - please let us know what your dealer says...
My '07 328i sporatically clanks LOUDLY going into reverse with my foot very firmly on the brakes. It seems to happen most often when I've left it parked on a slight nose-up incline.

There's a thread buried somewhere in the mechanical forum (I've searched but can't find it) that's similar, and suggests the problem is slop in a univeral joint in the driveshaft. They even posted a schematic that detailed where the dealer was supposed to apply threadlocker or sealant to fix the problem.

This is my third new BMW coupe, and the only car I've had the problem with. I'm in Germany, and have taken mine to Kohl BMW in Heinsberg twice. They haven't been able to reproduce the problem either time, but assure me what I'm describing does not sound normal.

MMVI · 01-10-2009, 12:09 AM

Are you sure it is the brakes.
Please try this when stationary.
Rev the engine past 1400 and then let it idle back.

Does it make the noise. I suspect it might as I have something similar
and I too thought it was something from the rear but aftre investigation it is the throttle, and under the hood.

I have had it investigated and the dealer says its normal, which I dont believe.

ah gon · 01-10-2009, 12:53 AM

Quote:

Originally Posted by MMVI

Are you sure it is the brakes.
Please try this when stationary.
Rev the engine past 1400 and then let it idle back.

Does it make the noise. I suspect it might as I have something similar
and I too thought it was something from the rear but aftre investigation it is the throttle, and under the hood.

I have had it investigated and the dealer says its normal, which I dont believe.

i'm pretty sure the sound is come from the brake.i have the same problem for my rear brake.everytime when i reverse my car and brake(no matter light or heavy put on brake),the sound will come up.but it happen recently after i replaced the new pad without change rotor.

but i'll gonna replace my rotor tomorrow.let's see what happen later.

Z22Z · 01-10-2009, 01:56 AM

same exact sound came to be in my car after i had the squeaky break issue fixed. it seems normal though as brake performance hasn't changed.

rg87 · 01-10-2009, 04:49 AM

it could be your bushings. they could possibly be cracked. i had the same problem on my e46. found out the bushings were done and had to be replaced. ever since, the "thump" sound is gone.

John 070 · 01-10-2009, 07:53 AM

Hate to say it, I noticed this sound too. It was not there before. It is not a squeal or groan, and my feeling was it wasn't from the pads/rotors, but somehow from the hardware....

ah gon · 01-10-2009, 09:56 AM

Quote:

Originally Posted by rg87

it could be your bushings. they could possibly be cracked. i had the same problem on my e46. found out the bushings were done and had to be replaced. ever since, the "thump" sound is gone.

sorry for misunderstand.where is the bushings located?what's parts is that?

ah gon · 01-11-2009, 04:00 PM

have the rear rotor replaced.sound is gone for now! i'll update if they happen again.

01-06-2009, 11:00 PM	#1
skimo Lieutenant 91 Rep 532 Posts Drives: 2011 335 vert Dinan II Join Date: May 2005 Location: Austin Texas !! iTrader: (1)	reverse + brakes = thump sound So I just got my car back from service. There was a squeeking noise coming from the back right wheel. They said it was the braek sensor - fixed it under warranty. But.. Now, when I go in reverse then apply the brakes..i hear a "thump" sound. Then when I go forward and apply the brakes I get another thump...if I apply the brakes twice I dont get the thump another time. I only get the thump the first time I apply the breaks going in a certain direction. like the brakes are loose or something?? Anyone experience this? Thanks in advance... skimo update: got car back from dealership. They said the sound was normal and due to the Break Assist Feature. Surprisingly, when I got the car back, the sound had gone away! They did do a transmission job where a bunch of components were changed (6mt). So maybe that was the transmission! Just speculating. Last edited by skimo; 02-15-2009 at 03:31 PM.. Reason: update
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01-06-2009, 11:04 PM	#2
2kaccordocoupe Brigadier General 1274 Rep 4,703 Posts Drives: Former ///M Driver Join Date: Nov 2008 Location: The 6ix iTrader: (2)	sounds like the pad could be loose or not sitting right
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01-07-2009, 06:56 AM	#3
mmm def Colonel 144 Rep 2,610 Posts Drives: 21 330, 19 ND2 RF, 11 RX350 Join Date: Dec 2006 Location: NJ iTrader: (0)	My car does that every time i switch direction, it's more of a click on mine. I say normal, my Honda Fit does it too.
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01-07-2009, 07:05 AM	#4
dxb335d The Tarmac Terrorist 949 Rep 29,345 Posts Drives: 997.2 GT3 Join Date: Mar 2007 Location: ''Fandango Towers'' iTrader: (3) Garage List 2010 Porsche 997.2 GT3 [9.50] 2003 BMW E46 M3 [6.00] 2007 BMW E92 335D [5.50]	Mine does it too, done it for months. On an incline or on level ground for you? We all get it on an incline as the pin comes out, but mine also does iton the flat. __________________ 997.2 GT3
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01-07-2009, 10:51 AM	#6
SUperfunkMF Private 0 Rep 99 Posts Drives: 08 335xi Coupe, 11 C63 P31 Join Date: Feb 2008 Location: Canada iTrader: (0)	Mine does it too. Seems normal as far as I can tell. __________________ 11 C63 P31 Iridium Silver, Black on Black. 08 335XI TiAg, Black on Alu trim,ZSP, STEP.
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01-07-2009, 10:54 AM	#7
archeroc New Member 2 Rep 10 Posts Drives: 335i, Monacco Blue on order Join Date: Jan 2009 Location: SoCAl iTrader: (0)	Are you using the emergency brake. Had that happen with a car about 15 years ago. For that car the emergency brake was looking up and the clunk was the releasing of the brake. The problem was misdiagnosed ended up cost $2,000 to fix.
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01-07-2009, 11:27 AM	#8
joec500 Brigadier General 125 Rep 3,004 Posts Drives: it has 4 wheels Join Date: Jul 2008 Location: San Francisco iTrader: (10)	Mine does that too and so did my B7 Audi A4
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01-07-2009, 03:58 PM	#9
E90330iS Major General 143 Rep 6,333 Posts Drives: BMW M4 Join Date: Jan 2006 Location: Arcadia, California iTrader: (56) Garage List 2006 330i [0.00]	Sounds like the transmission just switched gears... normal? __________________ 2017 BMW M4 DCT Lease Transfer: https://f80.bimmerpost.com/forums/sh...8#post23736398
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01-07-2009, 04:01 PM	#10
RambleJ Colonel 60 Rep 2,014 Posts Drives: F10 535i M-sport Join Date: Oct 2008 Location: Back in teh so cal iTrader: (2)	Mine did that too for a while.. then I realized it was something sliding around in my trunk!
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01-07-2009, 10:37 PM	#11
JO3 Lieutenant 12 Rep 566 Posts Drives: a lot Join Date: Mar 2006 Location: CA iTrader: (8)	It's normal. It's a characteristic of floating calipers. Basically what's happening is when you are moving forward and apply the brake, the pad shifts to one side of the caliper. When you go in reverse and apply the brake, the pad shifts to the other side of the caliper. That's why you only hear the clunk once, after you change direction.
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01-08-2009, 12:52 PM	#13
holson First Lieutenant 10 Rep 348 Posts Drives: Enterprise Rent-A-Car Join Date: Sep 2006 Location: Watertown, MA iTrader: (0)	mine does this too and sometimes when im just applying the brakes at slow speeds (bumper to bumper city traffic comes to mind). dealer looked at it and said it's normal... ok then
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01-08-2009, 11:05 PM	#14
skimo Lieutenant 91 Rep 532 Posts Drives: 2011 335 vert Dinan II Join Date: May 2005 Location: Austin Texas !! iTrader: (1)	thanks for the input guys....but this is a really loud "clunk"...actually people in the car today noticed and thought I hit something going in reverse!! I told them no "its normal"...then a few seconds later told myself what am I thinking...this must be checked...i will let you know what the dealer says.. Thanks!
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01-09-2009, 03:46 AM	#15
SpectreMech Private 7 Rep 87 Posts Drives: 2011 Z4 iDrive 35is Join Date: Dec 2007 Location: BF Idaho iTrader: (0)	Skimo - please let us know what your dealer says... My '07 328i sporatically clanks LOUDLY going into reverse with my foot very firmly on the brakes. It seems to happen most often when I've left it parked on a slight nose-up incline. There's a thread buried somewhere in the mechanical forum (I've searched but can't find it) that's similar, and suggests the problem is slop in a univeral joint in the driveshaft. They even posted a schematic that detailed where the dealer was supposed to apply threadlocker or sealant to fix the problem. This is my third new BMW coupe, and the only car I've had the problem with. I'm in Germany, and have taken mine to Kohl BMW in Heinsberg twice. They haven't been able to reproduce the problem either time, but assure me what I'm describing does not sound normal.
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01-10-2009, 12:09 AM	#16
MMVI Lieutenant 79 Rep 449 Posts Drives: 4 something Join Date: Aug 2005 Location: UK iTrader: (0)	Are you sure it is the brakes. Please try this when stationary. Rev the engine past 1400 and then let it idle back. Does it make the noise. I suspect it might as I have something similar and I too thought it was something from the rear but aftre investigation it is the throttle, and under the hood. I have had it investigated and the dealer says its normal, which I dont believe.
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01-10-2009, 01:56 AM	#18
Z22Z Lieutenant 33 Rep 536 Posts Drives: WRX Join Date: Dec 2008 Location: Glendale, CA iTrader: (0)	same exact sound came to be in my car after i had the squeaky break issue fixed. it seems normal though as brake performance hasn't changed.
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01-10-2009, 04:49 AM	#19
rg87 Lieutenant 51 Rep 513 Posts Drives: E90 Join Date: Jun 2007 Location: Bay Area, CA iTrader: (1)	it could be your bushings. they could possibly be cracked. i had the same problem on my e46. found out the bushings were done and had to be replaced. ever since, the "thump" sound is gone.
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01-10-2009, 07:53 AM	#20
John 070 Lieutenant General 1705 Rep 14,829 Posts Drives: 335i cpe Join Date: Oct 2006 Location: ZSP/ZPP/ZCW iTrader: (0)	Hate to say it, I noticed this sound too. It was not there before. It is not a squeal or groan, and my feeling was it wasn't from the pads/rotors, but somehow from the hardware....
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01-11-2009, 04:00 PM	#22
ah gon Colonel 112 Rep 2,433 Posts Drives: bmw e90 Join Date: Feb 2007 Location: vancouver b.c. canada iTrader: (12)	have the rear rotor replaced.sound is gone for now! i'll update if they happen again. __________________
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