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  #16  
Old 05-24-2007, 11:32 AM
tobybul's Avatar
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Quote:
Originally Posted by juanesoto View Post
Hey guys! What's up?

I'm thinking of doing a brake upgrade to my w123, using late w126 rotors and caliper. I already did some research of the pros and cons of doing this.

I already have the w126 Ate calipers. Now I need to buy the rotors, which I would like them to be drilled/slotted. Any good source to buy high quality rotors?

Thanks!
Why would you want to do this? What is wrong with the stock brakes?

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  #17  
Old 05-24-2007, 12:04 PM
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If you are going to do this, go with the earlier w126, that way all you need is the calipers and backing plate. I do alot of driving and am considering doing the same mod, as vented disks are not a prone to warping as solid rotor are. Cooler brakes means less fading.
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  #18  
Old 05-24-2007, 12:31 PM
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Quote:
Originally Posted by vstech View Post
I think the larger late 126 rotors require late calipers and larger wheels... don't forget this.
John
Indeed.

Quote:
Originally Posted by tobybul View Post
Why would you want to do this? What is wrong with the stock brakes?
Nothing. I just want to have the better cooling capabilities of a vented disc. Also, if I use the late w126 brakes, I'll have a little bit more of braking power, since those rotors are a bit larger in diameter.

BTW, will the brakes of a w124 fit in the w123? Just wondering...
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  #19  
Old 05-25-2007, 10:24 AM
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Quote:
Originally Posted by rrgrassi View Post
If you are going to do this, go with the earlier w126, that way all you need is the calipers and backing plate. I do alot of driving and am considering doing the same mod, as vented disks are not a prone to warping as solid rotor are. Cooler brakes means less fading.
by backing plate you mean dust shield? afik this is not required to change.

tom w
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  #20  
Old 05-25-2007, 10:28 AM
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Quote:
Originally Posted by t walgamuth View Post
by backing plate you mean dust shield? afik this is not required to change.

tom w
If that's the case, even better! Do you need a spacer to move the w123 caliper back a bit to accomodate the w126 rotor or does the w126 caliper have a wider opening to accomodate the vented disc?
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  #21  
Old 05-25-2007, 10:33 AM
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126 caliper is wider.
John
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  #22  
Old 05-25-2007, 11:29 AM
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Quote:
Originally Posted by Hatterasguy View Post
Bah get the Zimmerman X drilled rotors, or the ATE slotted ones.


The ATE's are great so are the Zimmerman's. The only down side of the drilled rotors is that they make some noise when you hit the brakes. They make a zipping noise because of all the holes, its not annoying its just something they do.
I never heard any noises wit ma Zimmermans....
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  #23  
Old 05-25-2007, 11:38 AM
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I thought it was strange to. But their is a distinctive zip sound that comes from them, if you have the windows down you can hear it. Its not loud but noticable.
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  #24  
Old 05-25-2007, 01:38 PM
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Quote:
Originally Posted by Hatterasguy View Post
Fastlane sells them, look them up online or give Phil a call. About $90 each, they are the most expensive rotor you can get for the W126.
I looked and all I see are vented.

[edit]

http://cgi.ebay.com/ebaymotors/84-72-Mercedes-240-280-300-Drilled-Rotor-Rotors-F-R_W0QQitemZ270120937225QQihZ017QQcategoryZ33564QQrdZ1QQcmdZViewItem

That is not a bad price for all 4 me thinks.
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  #25  
Old 05-25-2007, 01:40 PM
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when I ordered brembos for my W123 worldpac sent me vented W126 discs for the front. I was like.. hmm these dont seem to fit
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  #26  
Old 05-25-2007, 02:25 PM
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126 Brakes And Slotted or Drilled Rotors

Hi All!
Just thought I would clear up why race cars Really use slotted or drilled rotors.

It is not to save weight. The weight of a slotted or cross drilled rotor is only very slightly lighter than a non slotted or drilled rotor( do the math).

The real reason is that under very aggressive, race car style braking, the brake pads start to out gas. This gas has no where to go so its pressure builds up to the point that it is literally holding the pad away from the disc resulting in dramaticlly reduced friction and therefore reduced braking force. This same effect is responsible for 18- wheelers losing their brakes on long hills. The slots or holes give the gas somewhere to go, and prevent it from acting on the entire surface area of the pad. This reduces brake fade dramaticly.

Unless you are really planning on doing race car style driving or are trying to stop a big trailer, you really don't need the slotted or drilled rotors.

All of that said. I was also considering swapping to the 126 vented rotors for my 240D because eventually I will probably be towing a small trailer with it, and I just happen to know where there are 4 or 5 126 cars in a junk yard!

Cheers, Chris
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  #27  
Old 05-25-2007, 06:34 PM
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Quote:
Originally Posted by winmutt View Post
Just make sure they are not ghetto drilled Brembo's or some other cheap crap. Aftermarket Brembo rotors suck, they warp.
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  #28  
Old 05-25-2007, 06:35 PM
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Quote:
Originally Posted by Bio240D View Post
Hi All!
Just thought I would clear up why race cars Really use slotted or drilled rotors.

It is not to save weight. The weight of a slotted or cross drilled rotor is only very slightly lighter than a non slotted or drilled rotor( do the math).

The real reason is that under very aggressive, race car style braking, the brake pads start to out gas. This gas has no where to go so its pressure builds up to the point that it is literally holding the pad away from the disc resulting in dramaticlly reduced friction and therefore reduced braking force. This same effect is responsible for 18- wheelers losing their brakes on long hills. The slots or holes give the gas somewhere to go, and prevent it from acting on the entire surface area of the pad. This reduces brake fade dramaticly.

Unless you are really planning on doing race car style driving or are trying to stop a big trailer, you really don't need the slotted or drilled rotors.

All of that said. I was also considering swapping to the 126 vented rotors for my 240D because eventually I will probably be towing a small trailer with it, and I just happen to know where there are 4 or 5 126 cars in a junk yard!

Cheers, Chris
Yeah I know that, they are pointless on the street. Although I will say the ATE slotted rotors seem to shed water really well.

I have mine for looks, with my wheels they are quite visable, and I like the way they look. I also paint mine.

If you have stock wheels that hide them they are super pointless, I wouldn't bother just get OE or ATE rotors.

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