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  #16  
Old 11-30-2007, 02:31 PM
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Quote:
Originally Posted by Knightrider966 View Post
Your rotors are warped. That's where the vibration comes in. If they are too thin to turn, it's time to replace them!
MB recommends no turning - MB rotors are relatively thin and this makes the rotor to thin and dangerous
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  #17  
Old 11-30-2007, 02:38 PM
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Quote:
Originally Posted by 123Guy View Post
MB recommends no turning - MB rotors are relatively thin and this makes the rotor to thin and dangerous
If they are really warped, I'd be hesitant to do so, but if the thickness is within specs, then this is ok. (Totally German Auto, Phoenix.) Any reputable shop will tell you if these are to thin to turn anyway. I'd still get genuine or approved replacement parts and Chinese rotors are neither! The only thing they are guaranteed to do is fit.
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  #18  
Old 11-30-2007, 02:56 PM
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Brakes are safety items - don't cheap out on them. OEM rotors are NOT expensive. Buy new rotors, end of story. They're a whopping $28 each for Balo rotors at ***************, or $34/ea here at MBShop (link at top of page). They're a PITA to replace on the front of a W123, though. Use the OE/dealer neon-green wheel bearing grease if possible (it's not expensive), and do NOT mix grease types. Don't forget to order new grease seals, and use a dial indicator to set the wheel bearing end play (the spec is stupidly tight, 0.01-0.02mm, or something like that.)

Another option is to upgrade to 560SEL brakes, which are vented... the 123 has solid front rotors, which are a little undersized for the weight of the car.

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  #19  
Old 11-30-2007, 03:00 PM
AHH,What's up Doc????
 
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Quote:
Originally Posted by gsxr View Post
Brakes are safety items - don't cheap out on them. OEM rotors are NOT expensive. Buy new rotors, end of story. They're a whopping $28 each for Balo rotors at ***************, or $34/ea here at MBShop (link at top of page). They're a PITA to replace on the front of a W123, though. Use the OE/dealer neon-green wheel bearing grease if possible (it's not expensive), and do NOT mix grease types. Don't forget to order new grease seals, and use a dial indicator to set the wheel bearing end play (the spec is stupidly tight, 0.01-0.02mm, or something like that.)

Another option is to upgrade to 560SEL brakes, which are vented... the 123 has solid front rotors, which are a little undersized for the weight of the car.

Interesting about the 560 SEL brakes. what would be necessary for an exchange and retrofit? Just putting these on in place of the originals?
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  #20  
Old 11-30-2007, 03:04 PM
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Originally Posted by Knightrider966 View Post
Interesting about the 560 SEL brakes. what would be necessary for an exchange and retrofit? Just putting these on in place of the originals?
I have not done this myself, but I believe it's pretty close to a straight bolt-on, with the W126 calipers & rotors. I know some other forum mebers have done this. Maybe they could chime in? I know W124 brake upgrade options forwards, backwards, and upside down... but I've never investigated 123 stuff.

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  #21  
Old 11-30-2007, 03:32 PM
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Exclamation Rears?

Quote:
Originally Posted by spugeddy View Post
Noob question, but when I brake from higher speeds (like 45-55) and a good amount of pressure on the pedal I get some pretty bad vibration throughout the car.

I got new front brake pads almost a year ago, put on by a local shop here, but they didn't mention the rotors needing replaced.

I have just had a lot of work done recently so I want to not take it back, but can I assume I have a warped rotor, or worn down rotor... is there any other thing that it could be....

when I softly apply the brakes I get no vibration...

I can get the rotors for about $50 shipped, but is this a job a novice can handle. I have only done brakes once with my Dad, but I have a friend who is more experienced than I am....

Check the rear brakes and rotors. I recently replaced the front pads and rotors on mine which helped alot, but still have some vibration and oscillation apparently caused by the rear rotors.
In my case, it can be seen on the rotors in the form of heavy rust pitting from a combination of the car sitting alot and the calipers being partially setup. The rotor surface is visibly worn unevenly and varies from smooth to rough on it's faces. Normally though, it's not very obvious when they are "warped".
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  #22  
Old 11-30-2007, 04:34 PM
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front

I swear it is coming from the front passenger side....

I just feel it like that....
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  #23  
Old 12-03-2007, 12:31 PM
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easy or hard

Quote:
Originally Posted by gsxr View Post
They're a PITA to replace on the front of a W123, though.

Some people say easy job, some say hard.

I'll probably do a lookup here unless someone can elaborate?
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  #24  
Old 12-03-2007, 12:51 PM
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Originally Posted by spugeddy View Post
Some people say easy job, some say hard.

I'll probably do a lookup here unless someone can elaborate?
They're a PITA on a 123 because you have to mess with the bearings. On a 124, 129, 201, etc the rotor pops off the front of hub, no need to touch the bearings. It's a 10-minute job on those cars. On the 123, plan on several hours. Huge nuisance. Maybe not hard, just annoying...

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  #25  
Old 12-04-2007, 04:25 PM
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I'll pay someone

Ok,

I will probably pay someone then.
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85 300CD Turbo "Das Polluter" 230K sold for $3,000

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  #26  
Old 12-04-2007, 06:26 PM
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***update*****

The vibration nearly goes away when the brakes are hot.

In my 45 minute commute at around the 40 minute mark the vibration is nearly gone!!!!


Are the rotors are warmed up at that point and more pliable???
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  #27  
Old 12-12-2007, 12:53 PM
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It was a warped Rotor

It turned out to be a warped rotor, and so they are replacing the front two....

$150 labor! JC.

I understand it is a little different on a W123 (more labor) to change the rotors, so I will be happy with a smooth braking experience today on my ride home.

Merry Christmas to me.
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  #28  
Old 12-12-2007, 04:08 PM
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Talking soooooooooo smooth

Got my baby back, and the braking is oh so smooth.

Two new rotors, new seals, and labor around $200.
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