Boy did I feel stupid ...... - Mercedes Benz SLK Forum

AMGs For those high performance Mercedes-Benz R170/R171/R172 cars tuned by AMG

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#1 Old 12-04-2018
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Question Boy did I feel stupid ......

The other day (night actually when it was a little chilly) as I was driving my car on a nice spirited ride home on country roads, I kept hearing, just on the edge of audibly, something which sounded like a brake squeal. It was/is happening every time I was/am taking a corner and vigorously accelerating out of the turn. For a bit there, I thought I was hallucinating. Finally, the 300 W LED lit up over my head! It was ESP kicking in. That also explains why the rear brakes are wearing faster than the front brakes. I was wondering why I have substantially more pad thickness on my front brakes when I last checked. Has anybody else experienced this? Either brakes squealing on turn departure and/or accelerated rear pad wear?
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#2 Old 12-04-2018
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You sound like a very spirited driver if TCS is on all the time!

Turn that sucker off... if you dare!
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#3 Old 12-04-2018
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Brake squeal or tire squeal?
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#4 Old 12-04-2018
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Quote:
Originally Posted by Mensra View Post
The other day (night actually when it was a little chilly) as I was driving my car on a nice spirited ride home on country roads, I kept hearing, just on the edge of audibly, something which sounded like a brake squeal. It was/is happening every time I was/am taking a corner and vigorously accelerating out of the turn.
See above.
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#5 Old 12-04-2018
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I saw....it says

like a brake squeal

not

it was a brake squeal
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#6 Old 12-04-2018
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Since I do not have the capability to put a microphone next to the brake pad in question in order to definitively limit the sound to brake pad noise versus tire noise I can only put forth by somewhat limited observations from my frail human hearing.
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#7 Old 12-04-2018
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Then I would check tire pressure first to eliminate tire squeal


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#8 Old 12-04-2018
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Your rear brakes shouldn't be working harder than the front unless the computer cuts in... so If the light isn't flashing, then the brakes shouldn't be applying... Your rear brakes might be slightly stuck - cause could be multiple things but let's not go there until we determine if there is indeed a problem.
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#9 Old 12-04-2018
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All the relevant numbers are at spec. I have noticed significant wear on the back brake pads versus the front. If I keep my foot off of the go pedal when I take the corners I do not hear the noise, it does not matter how hard I corner as long as I don’t add power to the rear. And the squeals sounds exactly like the squeal I hear when the car has cold brakes and I am stopping lightly. (same high frequency) I have Continental DWS 06, and they don’t actually squeal when I apply power, it sounds more like a scuffing noise, not high frequency. The reason I’m asking, is because the ESP light is not coming on when I hear this noise.
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#10 Old 12-04-2018
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You may just have a dust cover that is ever-so-slightly contacting the brake rotor.
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#11 Old 12-04-2018
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But I only get a squeal when I accelerate vigorously out of the corner. It is possible that the ESP light is flickering on and off to fast for me to see. If I drive like a conservative old man (Sarge is a great example) the car is quiet like a Mercedes.
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#12 Old 12-04-2018
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Like turdo says, coming out of a corner, my civic does the same (dust cover is pushed in; how that happens, who knows) but bending it away cures it (for a while then reoccurs many miles later).

An easy fix if that's what the issue actually is. Does not happen on a straight-away (however slow that is in my civic ) and usually only turning one way. Doesn't do it for me turning the other way.

Weird cars


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#13 Old 12-04-2018
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Well, Mensra, it sounds as if it is time for you to check in at the big three-pointed silver star on Two Notch Road. They will love you for it.
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#14 Old 12-04-2018
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Unfortunately, I wouldn’t trust them to tell me if I need sunglasses in the Sahara desert at high noon. Their idea of fixing a problem is to wrap a new car around an oil change.
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#15 Old 12-04-2018
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My actual concern is not the noise, it’s very minimal, it’s the wear of the rear pads. I was wondering if anybody else was noticing the same phenomena. At 43,000 miles there is maybe 15% greater wear on the rear then on the front. I have not checked left to right rear wear variances.
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#16 Old 12-04-2018
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Quote:
Originally Posted by LeonardoDaBenz View Post
Like turdo says, coming out of a corner, my civic does the same (dust cover is pushed in; how that happens, who knows) but bending it away cures it (for a while then reoccurs many miles later).

An easy fix if that's what the issue actually is. Does not happen on a straight-away (however slow that is in my civic ) and usually only turning one way. Doesn't do it for me turning the other way.

Weird cars
I had the same thing a few years ago on a Vauxhall Signam.
It turned out to be the heat shield that was getting hot and deforming over time and touching the disc.
I would straighten it then it would reappear a few months later.
When I sold the car there was quite a few posts on the Vauxhall forums from people suffering the same thing so quite a common issue with some cars I guess


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#17 Old 12-04-2018
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The sound catches your attention, but I would investigate the pad wear first. Have you checked for any codes, or maybe have someone monitor with one of those Torque type applications on phone.
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#18 Old 12-04-2018
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No codes read.
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#19 Old 12-04-2018
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Once discs are hot, do you keep your foot on the brakes?

I'd expect fronts to wear faster (all things being equal) due to weight transfer under braking.
They will be working harder.

@frogfoot @Delucas thoughts?

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#20 Old 12-05-2018
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To eliminate the ESP possibility, if you are not seeing the light then it is not engaging. As for the mechanical concern the first thing that comes to mind is a sticky piston in your brakes. That would account for wear and the noise. Do you notice any slight pull to one side after you let off the brakes?
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