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  #1  
Old 01-08-2003, 10:26 AM
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Location: Winston-Salem, NC
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Car "creaks" when moving from a stationary position

Anyone have any diagnostic suggestions for my ’86 560SL?

Recently, my car has started to make a “creaking” noise. The sound appears when, from a stationary position (i.e., at a stop light), you remove your foot from the brake and start to roll forward. The sound disappears once the accelerator pedal is applied and the car accelerates.

To my ears, the sound seems to be emanating from the front suspension, but I’ve no better guess as to the cause.

Any ideas?
Thanks for any suggestions!
Ryan Potts
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  #2  
Old 01-08-2003, 01:08 PM
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Ryan,

Diagnostic suggestions:

How long does this continue if you don't put your foot on the gas? Try this in a nieghborhood or large parking lot.

Can you coast with your foot lightly on the brake and still hear it?

Does it happen in reverse gear?

If you let the car start coasting in Drive, then move it to Neutral, does it still groan?

Does it happen if you are turning left or right?

Try releasing, setting, and releasing your parking brake to make sure it's not sticking. Try using your parking brake when you are coasting slowly.
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Rodd
www.mbca.org - www.sl113.org - www.ohio4x4.com
2006 Wrangler Unlimited Rubicon
1997 E300D
1966 230SL
1980 450SL (for sale!)
PAST: 2006 C230, 1994 E420, 1994 Neon, 1983 Celica GT, 1984 300ZX, 1976 Electra Limited, 1984 Honda Nighthawk 650, 1979 Suzuki PE175
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  #3  
Old 01-08-2003, 01:29 PM
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Reply to Rodd

Hi Rodd - thanks for the reply. I've tried to answer your comments:

Diagnostic suggestions:

How long does this continue if you don't put your foot on the gas? Try this in a nieghborhood or large parking lot.

- the creaking noise stops as soon as I release my foot from the brake and the car starts to roll forward, so it isn't directly related to stepping on the gas, rather releasing the brakes and allowing the car to move forward

Can you coast with your foot lightly on the brake and still hear it?

- no, it only creaks when the car starts to move forward after being at a complete standstill

Does it happen in reverse gear?

- yep, same thing, just creaks when the brake is released and the car starts to move backward

If you let the car start coasting in Drive, then move it to Neutral, does it still groan?

- no

Does it happen if you are turning left or right?

- no

Try releasing, setting, and releasing your parking brake to make sure it's not sticking. Try using your parking brake when you are coasting slowly.

- parking brake doesn't make any difference, i.e., the car still creaks whether the parking brake is used whilst the car is stopped or not

Any ideas?
Thanks again, Ryan
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  #4  
Old 01-08-2003, 01:40 PM
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Location: Portsmouth UK
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For what its worth - my 'guess' is it is noise emanating from pad and disc. Maybe a bit of stiction which could be helped by a pad change (ru using MB pads I believe they are recommended by most) alternatively it could be a lazy piston or just general gunge around caliper sliding surfaces,

NormanB
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  #5  
Old 01-08-2003, 01:42 PM
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i know what your talkin about. its your brakes.... it happens when you have your foot just slightly on the brakes too. i used to make my car sing. haha. same thing happened to me on my car. nothing to worry about. but check them and put some brake grease on them.
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  #6  
Old 01-08-2003, 01:49 PM
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Have you checked/replaced your rubber flexible brake lines recently? Worn and soft lines will resist pulling the pads away from the calipers when taking your foot off the brake pedal.
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  #7  
Old 01-08-2003, 08:04 PM
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Join Date: Nov 2002
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For what it's worth, i have got the same noise coming from my front end on my 84 sl. I suspected that it might me rubber bushings loading/unloading. But I will look into the sticking brake piston issue.
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  #8  
Old 01-09-2003, 12:03 AM
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With the answers to your questions, I guess it to be the brake pads/disks as well. It sounds like the pads are not pulling away from the disk surface quick enough when the pedal is released. The previous posts seem to hit the points I would think of as well:

- rubber brake lines are swelled and constricted (common problem) and are not letting the fluid back out of the caliper.
- brake caliper pistons (or their rubber seals) are dirty or degraded and are making the piston stick in the cylinder.
- dirty/rusty pins that guide the brake pads are restricting movement.

If you're handy yourself, you could inexpensively replace the rubber brake lines, flush/refill the brake fluid, and examine the whole brake assembly (remove pads and caliper, examine the pins, piston seals, pads, disks, etc for anything unusual). Maybe it just needs a good cleaning. If you're not a DIY person, then you can have it done by your regular mechanic.

On my SL (a little older), I went about this "look and see" procedure and ended up replacing everything. New rotors, pads, rubber brake lines, rubber piston seals, and new pistons. I cleaned every associated part I could. Of course, I replaced the wheel bearings while they were accessible.
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Rodd
www.mbca.org - www.sl113.org - www.ohio4x4.com
2006 Wrangler Unlimited Rubicon
1997 E300D
1966 230SL
1980 450SL (for sale!)
PAST: 2006 C230, 1994 E420, 1994 Neon, 1983 Celica GT, 1984 300ZX, 1976 Electra Limited, 1984 Honda Nighthawk 650, 1979 Suzuki PE175
http://badges.fuelly.com/images/sig-us/662536.png
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  #9  
Old 01-09-2003, 08:45 AM
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Great - thanks everyone for the advice. Looks like I have another project to work on!

Ryan
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