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Old 04-30-2003, 09:29 PM
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Angry This brake noise is driving me up the wall

Recently replaced all brakes (rotors, pads and hoses) and wheel bearings as well as most other suspension pieces. The car rides ten times better. Lately, I,ve noticed a clack clack clack clacking sound coming from the driver's side front wheel. The frequncy of the clacking depends on the speed. I don't feel it much in the steering wheel and the sound dissappears when I brake. Braking performance is still very good. Brake dust has accumulated more on this wheel than the others.
I suspect a warped rotor. Could there be a chance that this has anything to do with the caliper? How could a rotor warp so soon? Is there anything else I can check or do to eliminate this sound? Is driving under this condition unsafe?

Thanks in advance for any and all advice.

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Old 05-01-2003, 01:30 AM
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Join Date: Jan 2000
Location: PA
Posts: 5,440

I don't think its a warped rotor. They don't make any noise as far as I know. With a warped rotor you would feel a pulsing in the brake pedal.

Check to see if the caliper is tight. You may have to put a washer under the head of the bolt that mounts the caliper. This happened to me. Is the locking device (that you bend up the ears) under the caliper bolt?

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Old 05-02-2003, 12:52 PM
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I didn't even know that a locking device even existed!

Perhaps the PO had the car serviced by a non-MB tech. When I replaced the old rotors, there were only the bolts holding the rotor to the hub. If I understand you correctly, you are saying that perhaps my rotor bolts may be tightened unequally and that is creating the sound. In your opinion would retorqueing the bolts alleviate the noise? So what about these locks? I've never seen them in the service manual or the fastlane catalog.

Thanks for the reply
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Old 05-02-2003, 01:06 PM
Join Date: Jul 2001
Location: Old Lyme, Connecticut
Posts: 3,596

What model car are you working on?

The W123 calipers have locking tabs sticking out from a washer plate that fits under the fastener holding the caliper. Later cars use self-locking fasteners and you either replace them or the self locking goop on the fastener. The new fastener comes with a blob of blue stuff on a small area of the threads which is in all probability a version of Locktite thread locking compound. This stuff is not all gone when the fastener comes out, but it is kind of smooshed into the adjacent threads so it may not be as effective on re-use. If you have a W124 or later car, and reused the fastener without refreshing the locking feature, you may have a bolt backing out. If it is a W123 and you did not use the locking tabs on the washers, you may also have a bolt backing out. Either case is not good.

If you tell us which car you have we can try to narrow down the possible solutions. But diagnosing a noise via text interfacing is particularly challenging. Good luck, Jim
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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Old 05-03-2003, 05:36 AM
Posts: n/a
It's a w126 300sd

I really hope this problem is as simple to fix as you suggest. I'll go over these connections on my day off. I appreciate your input.

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