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Old 08-02-2017, 01:48 PM
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Join Date: Sep 2006
Posts: 667
w126 rear brake anti-rattle clip screech

I replaced my 1983 380sel's rear brake discs, pads and hardware with Centric parts and was rewarded with a cyclical, metal-on-metal screeching sound while driving. After ruling out sticky calipers, parking brake shoes and wheel bearings, I realized the Centric rotors have part numbers stamped into their sides, and the anti-rattle clip was riding along the rotor and screeching on those part numbers like a turntable needle. I knocked down the part numbers with a sharpening stone and the screech is now heard only on turns and much fainter.

My question: Is the w126 rear brake anti-rattle clip / spring retainer supposed to make contact with the rotor? This could just be a poor aftermarket part quality problem.

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Old 08-02-2017, 02:57 PM
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Join Date: Feb 2011
Location: Modesto CA
Posts: 2,965

Compare the outside diameter of the new rotors with that of the ones removed.
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Old 08-03-2017, 03:05 PM
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Join Date: Sep 2006
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I'll order ATE rear brake rotors and hardware and compare outside rotor diameters to the Centric 12135002 rotors and the ones removed from the car.

My early W126 uses a dowel pin for rear brake rotor alignment, not a screw as in later versions. The Centric rotors have a loose fit at this dowel pin, so it's possible the rotors aren't centered well and are scraping the anti-rattle clips as a result. Maybe I got what I paid for with $13 brake rotors, or the clips are too long or something.
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Old 08-03-2017, 04:53 PM
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Join Date: Aug 2002
Location: Southeastern PA
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derburger, the rotors should be hub-centered and not reliant on the dowel or set screw for alignment. Rotors for $13 smacks of Chinese junk, and not recommended for use on a MB vehicle.
Fred Hoelzle
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Old 08-04-2017, 09:25 AM
Mike Murrell's Avatar
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Join Date: Feb 2000
Posts: 2,574
Have been doing a turn key brake job on all 4 corners. Rebuilt ATE calipers. Unfortunately they came with pins/spring plate for either a Bendix/Girling unit.

Not saying this is your problem - just throwing it out.
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
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Old 08-21-2017, 12:40 AM
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Join Date: Sep 2006
Posts: 667
For posterity, I replaced the Centric rear rotors with Zimmermann ones and solved the weird screeching problem. The Zimmermann rotors have a slightly smaller outside diameter than the Centrics and clear the anti-rattle clip.

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