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Old 06-16-2013   #1 (permalink)
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Exclamation Noisy rear brakes!!!

Hi all,
Can any one help? When I reverse and touch the brakes I get a clicking/ knocking sound coming from the back of the car, It only does it when I press the brake peddle and only in reveres! if I keep tapping the peddle I keep getting the click/knock noise. I have taken the callipers off all seems ok with them, I have taken the rotors off and made sure the handbrake shoes are all in tact, nothing seems out of the ordinary. I've run out of ideas and don't know what to look at next. Any thoughts.

DaveSlk
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Old 06-16-2013   #2 (permalink)
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Have you always had it and if not have you just changed your wheels ? The bolts may be slightly too long ??
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Old 06-16-2013   #3 (permalink)
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Thanks for the response, I have changed the wheels but that was 9 months ago, no problem with the wheel nuts, it only makes the noise when touching and releasing the brake peddle when in reverse.
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Old 06-16-2013   #4 (permalink)
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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.

Clicking Noises

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 ??
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Old 06-17-2013   #5 (permalink)
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Thanks again, I will try taking the pads out and giving them a good greesing! wont be till the weekemd now but will let you know how it goes.
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Old 06-17-2013   #6 (permalink)
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Hi Dave.

What you describe is perfectly normal as already stated and would only go to confirm that you pads are free to move as designed.
If you use grease, make sure it is the copper variety and use it sparingly. I have posted a set of instructions and photos within the DIY section which might assist you in a strip down.

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Old 2 Days Ago   #7 (permalink)
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I think I got a problem with my rear break aswell, driving to work this morning and stuck in traffic I started to hear a small "knock" when I pressed the break a little hard when moving in traffic. It seems to be coming from the back right, and only when I press the break hard. Wasnt doing this before. I didnt have anything in the trunk so it can be something flying around.

Any ideas?
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Old 2 Days Ago   #8 (permalink)
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Hi Guys, not sure if the rear suspension on an SLK 200 is the same as a 350 but if you have had the calipers off, the mounting bolts are difficult to access and re-torque. It's easier if you move the torsion bar drop rod or you can set up a ring spanner/wrench with extra leverage and give the bolts a good tightening thus guessing the torque and use thread lock too. However if you did loosen the drop rod you have to make sure it's fully tightened back up or you'll get clicking and knocking. Of course the above may have absolutely nothing to do with your noises!
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