Join Date: May 2010
Vehicle: Slk 200K 2004 r171
Other Toys: Bmw 528iA
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Taken from internet :
" When you hear any kind of brakes noise, you can safely assume there is an issue with your brakes. The noise may or may not be an indication of a serious brake issue. However, whether the issue is minor or severe, it still requires attention and investigation. When you hear brake noise when your car is in reverse, this should be a sign to you that a few possible issues are occurring.
A common noise heard from brakes while a vehicle is in reverse is a clicking noise. Most commonly, this clicking noise can be accounted to the brake pads moving or shifting into the new direction of travel. The noise is actually caused by the brake pad making contact with the caliper. This noise does not necessarily mean there is a larger issue going on. However, you can minimize and often eliminate this clicking noise by applying a disk brake caliper grease. The grease should lubricate the brakes and help eliminate the clicking noise. After applying the grease, you should investigate the clicking noise further if still heard at the same frequency or level as before applying the grease.
Squealing – Wear Tabs
Squealing and squeaking when driving in reverse can be caused by several different issues, so after investigating one issue you should research more if the issue still persists. When hearing a squealing or squeaking noise when traveling in reverse, there are several things you can check and try to eliminate the noise. If your vehicle is not new or does not have many miles on the brakes, then the first thing you should check is your wear tabs. If your brakes have worn down by at least 15 percent, your wear tabs may be creating the noise. Your wear tabs, located at the end of the brake pads, can rub against the rotor creating a squealing or squeaking noise. This can be an indication that your brakes need replacing.
Squealing – Check for Metal
Usually, squealing occurs when metal touches another metal. The next thing to check is in between your rotors and pads. If any small fragments or pieces of metal are between these two, the effect will be a squealing or squeaking sound. By cleaning the rotors and pads, you might be able to free a small fragment causing the noise.
Squealing – Grease Shims
If your vehicle is newer or you have already checked the wear tabs, the next thing to do is check your shims to see if they need greasing. The shims, attached to the back of the brake pads, need to have lubrication. Shims should have a light layer of grease on either side that can lube the shim and eliminate squealing or squeaking.
Squealing – Resurfacing Rotors
If the previous options have not helped, you can take a more extreme measure to eliminate the squealing by lightly sanding your rotors. By recreating the smooth finish that the rotors should have by resurfacing them, you can eliminate the cause of the squeal or squeak noise in your brakes when traveling in reverse " .
Try putting a stiff card shim between the pads and the piston ??