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Old 02-24-2001, 01:19 AM
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Hi all,
Recently I have found out that when I reverse and then brake there appears to be a squeaky noise from the brake (or other place) but the squeaky noise doesn't seem to happen when I move forward then brake...please help if you have any idea what might cause this
My car is a '99 C280
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Old 02-24-2001, 01:07 PM
MikeTangas's Avatar
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Join Date: Apr 2000
Location: So. Cal
Posts: 4,430
Could you be describing the "Mercedes moan"? If so, it's most likely just the brakes talking, nothing wrong, it has to do with the composite of the brake pad material and "harmonics" of the rotor. Hmmmmmmmm.
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

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Old 02-24-2001, 02:11 PM
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Well I don't know how to describe, but I'll try my best
It is like when I reverse and then stop by apply the brakes, the squeaky noise occurs until the car comes to a complete stop
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Old 02-24-2001, 05:09 PM
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It stops because the brake pads are not rubbing on the disc anymore. I will never forget the day I was in my Mechanics garage and he just finished a major service on a 300 sd. The guy who owned it was kinda fidgety and when he backed out it made the squuuuuuuuuuuuuuuuuqqqe, the guy glared at the mech and the mech yelled its ok, its ok thats normal. The look on the guys face did not seem as if he was convinced. My TE does it every morning as I back out of my garage!
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Old 02-24-2001, 10:41 PM
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So u guys are saying it is ok???
Well just out of the curiousity, what's the cause of it to happen?
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Old 02-24-2001, 11:24 PM
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Friction, force that opposes the motion of an object when the object is in contact with another object or surface. Friction results from two surfaces rubbing against each other or moving relative to one another. It can hinder the motion of an object or prevent an object from moving at all. The strength of frictional force depends on the nature of the surfaces that are in contact and the force pushing them together. This force is usually related to the weight of the object or objects. In cases involving fluid friction, the force depends upon the shape and speed of an object as it moves through air, water, or other fluid.

Friction occurs to some degree in almost all situations involving physical objects. In many cases, such as in a running automobile engine, it hinders a process. For example, friction between the moving parts of an engine resists the engine's motion and turns energy into heat, reducing the engine's efficiency. Friction also makes it difficult to slide a heavy object, such as a refrigerator or bookcase, along the ground. In other cases, friction is helpful. Friction between people's shoes and the ground allows people to walk by pushing off the ground without slipping. On a slick surface, such as ice, shoes slip and slide instead of gripping because of the lack of friction, making walking difficult. Friction allows car tires to grip and roll along the road without skidding. Friction between nails and beams prevents the nails from sliding out and keeps buildings standing.
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Old 02-24-2001, 11:59 PM
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When friction affects a moving object, it turns the object's kinetic energy, or energy of motion, into heat. People welcome the heat caused by friction when rubbing their hands together to stay warm. Frictional heat is not so welcome when it damages machine parts, such as car brakes.
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Old 02-25-2001, 01:41 AM
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There is a whole lot of friction in here , just kidding.

I too am waiting for a tech to weigh in on this one as this doesn't occur on other cars using basically identical designs in braking systems?

[Edited by roas on 02-25-2001 at 01:48 AM]
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