Change rotors when changing pads? - Mercedes-Benz Forum

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 13 (permalink) Old 06-01-2010, 10:12 AM Thread Starter
BenzWorld Newbie
 
Date registered: Jun 2010
Posts: 2
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
Exclamation Change rotors when changing pads?

I own a C-280 sport, this is my first benz and i'm lovin it!
QUESTION..
I want to get the pads changed as they are starting to wear down. I called my local foreign car shop and they only change the pads with rotos, NOT pads only.

I only know american cars, but i have always only changed the rotors if there is obvious wear on them ie: (discoloration or warping).

Do i have to get the rotors changed as well?
If so, why is that?
juka_benz is offline  
Sponsored Links
Advertisement
 
post #2 of 13 (permalink) Old 06-01-2010, 10:27 AM
BenzWorld Elite
 
Date registered: May 2005
Vehicle: '07 GL320CDI
Location: Albuquerque
Posts: 5,070
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
It's fairly normal these days, but there are published figures regarding measuring the remaining thickness of the rotors.

There are two numbers.

1. Never go below this number

2. Replace anyway when changing pads because rotor will be worn out before the pads.

You can reach through your wheel and feel/observe whether there's a "lip" on the outside edge of the rotor that indicates amount of missing metal.

Kent Christensen
Albuquerque
'07 GL320CDI
lkchris is offline  
post #3 of 13 (permalink) Old 06-01-2010, 11:08 AM
Outstanding Contributor
 
keyhole's Avatar
 
Date registered: Sep 2006
Vehicle: 2004 CLK 240 Coupe
Location: Norfolk. UK
Posts: 10,464
Mentioned: 10 Post(s)
Quoted: 356 Post(s)
Quote:
Originally Posted by lkchris View Post
It's fairly normal these days, but there are published figures regarding measuring the remaining thickness of the rotors.

2. Replace anyway when changing pads because rotor will be worn out before the pads.
I am surprised to read both of those statements...

a) I understand that it's very common to replace the pads only. I have myself.

b) I have never replaced a rotor. (many cars, many years) WIS suggests disc replacement when thickness is reduced by 2.0 - 2.5mm from the original. As you said, it would be obvious to the touch.
keyhole is offline  
post #4 of 13 (permalink) Old 06-01-2010, 11:46 AM
BenzWorld Elite
 
Date registered: Dec 2008
Vehicle: w204 (C350ELE)
Location: Miami, Fl and Mar del Plata, Argentina
Posts: 1,262
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Quote:
Originally Posted by keyhole View Post
I am surprised to read both of those statements...

a) I understand that it's very common to replace the pads only. I have myself.

b) I have never replaced a rotor. (many cars, many years) WIS suggests disc replacement when thickness is reduced by 2.0 - 2.5mm from the original. As you said, it would be obvious to the touch.
It is perhaps a bit more complex than this, to include warping, wobbling, run-out, different disc thicknesses and materials... but you are right. Rotor wear is different than pad wear and the two should be evaluated separately and then revamped so they are able to work properly together till the next scheduled service.

A car would show appreciation for preventive maintenance by never leaving his owner stranded.

Defensive Driving is never having to say you're sorry: a true love story between man and machine.
JoeVal is offline  
post #5 of 13 (permalink) Old 06-01-2010, 02:03 PM
BenzWorld Elite
 
Date registered: May 2005
Vehicle: '07 GL320CDI
Location: Albuquerque
Posts: 5,070
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Lots of folks are still living in the 1990s (or earlier).

TODAY's cars feature light brake rotors as an attempt to keep down vehicle weight (for fuel economy) and unsprung weight (for performance). This means thinner brake rotors.

It's MEANINGLESS what you "used to do" or did on other makes of cars.

Just measure the rotors and compare to Mercedes specification and leave expectations out of it.

ZIP/ZERO/NADA of this represents a decline in quality.

Kent Christensen
Albuquerque
'07 GL320CDI
lkchris is offline  
post #6 of 13 (permalink) Old 06-01-2010, 06:23 PM
Outstanding Contributor
 
keyhole's Avatar
 
Date registered: Sep 2006
Vehicle: 2004 CLK 240 Coupe
Location: Norfolk. UK
Posts: 10,464
Mentioned: 10 Post(s)
Quoted: 356 Post(s)
Whatever...

I still do not believe you when you claim that the rotor will wear out before the pads. Where did you get that information from?
keyhole is offline  
post #7 of 13 (permalink) Old 06-01-2010, 09:28 PM
BenzWorld Elite
 
Date registered: May 2005
Vehicle: '07 GL320CDI
Location: Albuquerque
Posts: 5,070
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Quote:
Originally Posted by keyhole View Post
Whatever...

I still do not believe you when you claim that the rotor will wear out before the pads. Where did you get that information from?
Why else do you suppose Mercedes publishes this figure?

Do you not think they've tested the system?

Nothing to do with "believing me" of course, just what you want to believe (based on lack of knowledge).

Kent Christensen
Albuquerque
'07 GL320CDI
lkchris is offline  
post #8 of 13 (permalink) Old 06-02-2010, 06:39 AM
~BANNED~
 
Date registered: May 2010
Vehicle: 2007 E350 4Matic P2; 2008 GL320 CDI P2
Location: Chicago NW Burbs
Posts: 20,153
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Quote:
Originally Posted by lkchris View Post
Why else do you suppose Mercedes publishes this figure?.
Minimum thickness has been published ever since disk brakes were standard on any car.

That does not answer that question of the rotors wearing out before the pads.
N_Jay is offline  
post #9 of 13 (permalink) Old 06-02-2010, 08:59 AM
Lifetime Premium Member
 
Musikmann's Avatar
 
Date registered: May 2006
Vehicle: 2001 E320 - Brilliant Silver/Ash: 107,000+
Location: West Virginia, USA
Posts: 17,193
Mentioned: 0 Post(s)
Quoted: 6 Post(s)
Lifetime Premium Member
I've read here that on average, the rotors will last for 2 sets of pads. But there are bound to be exceptions. Just measure them and go by the minimum thickness as suggested.

Mercedes Benz - Das beste oder nichts!

Last edited by Musikmann; 06-02-2010 at 09:11 AM.
Musikmann is offline  
post #10 of 13 (permalink) Old 06-02-2010, 09:59 PM Thread Starter
BenzWorld Newbie
 
Date registered: Jun 2010
Posts: 2
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
I checked the rotors yesterday, and there is a pretty noticable lip on them, i will change them along with the pads, thanks for the info to those of you who gave it.
juka_benz is offline  
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > General Mercedes-Benz Forums > General Mercedes-Benz

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mercedes-Benz 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)
     
    Thread Tools
    Show Printable Version Show Printable Version
    Email this Page Email this Page
    Display Modes
    Linear Mode Linear Mode



    Similar Threads
    Topic Author Forum Replies Last Post
    2002 c230 changing Brake Pads/rotors jelost The Discount Tire Direct Tire, Wheel, Brake & Suspension 9 06-26-2012 07:06 PM
    How to change brake pads and rotors washington dc ML W163 M-Class 6 12-05-2011 04:18 PM
    Changing my rotors and Brake pads on CLK430 myself walterf C208/A208 CLK-Class 4 07-13-2006 10:07 PM
    Noise after changing rotors and pads. bass1175 W140 S-Class 11 05-11-2006 07:00 PM
    good price on changing of stocks/springpads/rotors/and brake pads Phade C208/A208 CLK-Class 6 07-04-2005 01:30 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

     

    Title goes here

    close
    video goes here
    description goes here. Read Full Story
    For the best viewing experience please update your browser to Google Chrome