SLK200, sounds coming from front tire, gone when i break - Mercedes Benz SLK Forum

Tires, Wheels, Brakes & Suspension Discussion and information regarding tires, wheels, brakes and suspension.

 1Likes
  • 1 Post By Mensra
 
LinkBack Thread Tools
#1 Old 08-17-2018
Registered Users
 
Join Date: Jul 2017
Location: Norway
Vehicle: 1998 Mercedes SLK 200, R170
Posts: 48
Country:
Chats: 0
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Thanks: 9
Thanked 1 Time in 1 Post
(Thread Starter)
SLK200, sounds coming from front tire, gone when i break

There are a "thud - thud - thud - thud" coming from what seems to be my right left tire somewhere.
It increases in frequency and loudness the faster i drive, but if i just slightly presses the brake its gone, and if i break hard, its gone for a while before the sound comes back. which brings me to believe its something with the brake.

It starts at about 40km/h, but after a hard brake i can drive in 100km/h with no problem, for a while before returning.

Anyone have any idea what the problem might be? sliders?
There are new brake pads all around, I had an issue with squealing noise from the brake a while after i change them, i have no idea if its related, but the sound went away about a week ago.

Last edited by aklla; 08-18-2018 at 11:22 AM.
aklla is offline  
Sponsored Links
Advertisement
 
#2 Old 08-17-2018
Registered Users
 
Join Date: Apr 2013
Location: Sidney, BC
Vehicle: 2001 SLK320
Other Toys: Traded them all!!
Posts: 665
Country:
Chats: 0
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 103 Post(s)
Thanks: 27
Thanked 43 Times in 39 Posts
Quote:
Originally Posted by aklla View Post
There are a "thud - thud - thud - thud" coming from what seems to be my right front tire somewhere.
It increases in frequency and loudness the faster i drive, but if i just slightly presses the brake its gone, and if i break hard, its gone for a while before the sound comes back. which brings me to believe its something with the brake.

It starts at about 40km/h, but after a hard brake i can drive in 100km/h with no problem, for a while before returning.

Anyone have any idea what the problem might be? sliders?
There are new brake pads all around, I had an issue with squealing noise from the brake a while after i change them, i have no idea if its related, but the sound went away about a week ago.

My money is on a bent rotor. They can distort under heavy braking when they get down to minimum thickness. Also some folks thing turning them to reface them is a cheap way to avoid replacing them and a couple of things can happen.
First they get turned past the minimum and hence warp under heavy braking because of the heat.
They also can be cut too hard and fast when being refaced and the heat generated is enough to change the metal characteristics and they warp the first time they are used in heavy braking.
New OEM rotors area available at reasonable prices.
Alex 3 is offline  
#3 Old 08-17-2018
Registered Users
 
Join Date: Jul 2017
Location: Norway
Vehicle: 1998 Mercedes SLK 200, R170
Posts: 48
Country:
Chats: 0
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Thanks: 9
Thanked 1 Time in 1 Post
(Thread Starter)
With rotor, you mean brake disc, right?
I think it sounds a bit weird, as it just suddenly happened with no hard brake or anything like that.
Secondly, why does the sound go away for a while after i brake hard? Shouldn't it be there constantly?
aklla is offline  
 
#4 Old 08-18-2018
Premium Member
 
Australian's Avatar
 
Join Date: Sep 2012
Location: South Australia
Vehicle: SLK 320 2002
Other Toys: Just a shopping trolley.
Posts: 489
Country:
Chats: 0
Mentioned: 199 Post(s)
Tagged: 0 Thread(s)
Quoted: 74 Post(s)
Thanks: 8
Thanked 49 Times in 48 Posts
This is interesting. I have had 'bent' rotors (discs) fairly often, on a variety of cars. I always get them machined but over here no brake shop will take them below the minimum thickness - it's illegal and they won't do it.


Warped discs produce a vibration under light braking. Easily diagnosed. If you don't have this, then I doubt it's warped discs.


Having said that, I can't offer any other explanation. I assume your wheel nuts are tight!!
Australian is online now  
The Following User Says Thank You to Australian For This Useful Post:
#5 Old 08-18-2018
Moderator

 
LeonardoDaBenz's Avatar
 
Join Date: Aug 2016
Location: Near Toronto, Ontario
Vehicle: 2012 SLK55 AMG "SCHWARZIE"
Other Toys: Magnum RT and an ugly Civic
Posts: 9,741
Country:
Chats: 0
Mentioned: 60 Post(s)
Tagged: 0 Thread(s)
Quoted: 1011 Post(s)
Thanks: 346
Thanked 574 Times in 535 Posts
Garage
Quote:
Originally Posted by Australian View Post
Warped discs produce a vibration under light braking. Easily diagnosed. If you don't have this, then I doubt it's warped discs.

Having said that, I can't offer any other explanation. I assume your wheel nuts are tight!!
Rotor: Can feel it under light/medium braking (and heavy as well but I rarely have the need for heavy braking--safe distance and all you know ) and can also hear it. On my wagon.

It's not a serious issue, more of an annoyance.

If nuts are loose, you'll notice it (slight feel--a wobble and it is noticeable) and you can tell which wheel but can also hear it) under heavy acceleration.

Once at a steady speed, it disappears (in my experience anyways, again on my wagon). Obviously, that IS an issue .


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



LEN

(Moderator)

“I can’t give you a sure-fire formula for success, but I can give
you a formula for failure: try to please everybody all the time.”


Herbert Bayard Swope
LeonardoDaBenz is online now  
#6 Old 08-18-2018
Registered Users
 
Mensra's Avatar
 
Join Date: Mar 2013
Location: The boondocks
Vehicle: 2012 SLK 55 w/P30 aka “The Garbage Scow”
Other Toys: Wellcraft Scarab, Porsche Macan S
Posts: 3,192
Country:
Chats: 0
Mentioned: 33 Post(s)
Tagged: 0 Thread(s)
Quoted: 363 Post(s)
Thanks: 294
Thanked 261 Times in 235 Posts
Garage
Send a message via AIM to Mensra Send a message via MSN to Mensra
This happened to me once another car many years ago. I had belt separation and the braking caused the belt to wedge up against the tire carcass. So the sound would go away after I braked, but would come back shortly afterwards. The tire shop told me they saw this rarely, but it did happen occasionally. I believe this was back in the mid-1970s. Something to consider if there is no pedal modulation. Just a quick brainstorm.
Avel Du likes this.
Mensra is online now  
#7 Old 08-18-2018
Registered Users
 
Join Date: Jul 2017
Location: Norway
Vehicle: 1998 Mercedes SLK 200, R170
Posts: 48
Country:
Chats: 0
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Thanks: 9
Thanked 1 Time in 1 Post
(Thread Starter)
I still cant understand the symptoms.
I started with the bolts, kinda just to confirm that they were tight, because I didnt have any wobble or unstability, just the sound. And i cant understand why it went away after a hard brake or at a slight brake. Driving with the brakes just barely touching on shuldnt have any effect on the bolts, right?



But 4 out of 5 bolts om my front left wheel were a bit loose, I tighten them all and the problem seems to be gone.
Weird.
aklla is offline  
#8 Old 08-18-2018
Moderator

 
LeonardoDaBenz's Avatar
 
Join Date: Aug 2016
Location: Near Toronto, Ontario
Vehicle: 2012 SLK55 AMG "SCHWARZIE"
Other Toys: Magnum RT and an ugly Civic
Posts: 9,741
Country:
Chats: 0
Mentioned: 60 Post(s)
Tagged: 0 Thread(s)
Quoted: 1011 Post(s)
Thanks: 346
Thanked 574 Times in 535 Posts
Garage
Quote:
Originally Posted by aklla View Post

But 4 out of 5 bolts om my front left wheel were a bit loose, I tighten them all and the problem seems to be gone.
Weird.
Why weird? Apparently not tightened properly in the past. Using a torque wrench? 80 lb ./110 NM. Check them monthly if not. Also tire pressures should be checked regularly (at gas fill up is when I check: keep the gauge in the glove box).


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



LEN

(Moderator)

“I can’t give you a sure-fire formula for success, but I can give
you a formula for failure: try to please everybody all the time.”


Herbert Bayard Swope
LeonardoDaBenz is online now  
#9 Old 08-18-2018
Registered Users
 
Join Date: Jul 2017
Location: Norway
Vehicle: 1998 Mercedes SLK 200, R170
Posts: 48
Country:
Chats: 0
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Thanks: 9
Thanked 1 Time in 1 Post
(Thread Starter)
I always use a 110nm torque stick on my impact wrench to not overtighten.



What was weird is the symptoms, not that they came loose, I know that can happen
aklla is offline  
Sponsored Links
Advertisement
 
Reply

  Lower Navigation
Go Back   Mercedes Benz SLK Forum > Technical Information > Tires, Wheels, Brakes & Suspension

Bookmarks

Quick Reply
Message:
Options
Upload your files to MEGAUPLOAD
Upload your images to ImageShack

Register Now



In order to be able to post messages on the Mercedes Benz SLK Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Drivers front window keeps coming off the rails DrStrangeLug SLK R170 General Discussion 2 09-28-2014 12:14 PM
My Tire Got Spiked Today! Bassman62 General Discussion 7 02-23-2014 09:47 PM
Front Tire Wear Norm rosros SLK R171 General Discussion 10 05-02-2011 08:17 AM
Highway tire blow out, and new tire questions Henryhank SLK R171 General Discussion 13 07-30-2008 05:20 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome
 

Clubs, Garage Plus vBulletin Plugins by Drive Thru Online, Inc.