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1992 500SL
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16 Posts
Discussion Starter #1
Hello,

I installed new shocks and struts yesterday. That went very well. The problem that I am seeing has to do with going aound turns with a slight lean, all of a sudden, the roll bar pops up. Once the roll bar has popped up, when I go around a similar turn, the central locking system disengages all locks except for the drivers side. If I had the roll bar back down, it would pop again

Does anyone know what could be causing this? It was not happening before the shock/strut install. But is it possible that they are settling or....? Not real sure.

Thanks in advance
 

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SL60 ///AMG
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110 Posts
re: 1990 500SL Installed shocks & struts..Roll bar pops up now????

The car have gauge under the car that measure the tilt of the car. If the tilt is to much, the roll-over bar pops up. I think that gauge can be adjusted depending on settings, and I think you found the cause to the problem here.
 

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2000 SL500
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106 Posts
re: 1990 500SL Installed shocks & struts..Roll bar pops up now????

From what I have read and understand the roll bar will pop up under severe breaking, severe manuvers and when the car is at particular angles(roll over protection). Since you have put different shocks and struts, the way that they deflect may be causing the car to think something bad is happening. I hope that this helps.
 

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Outstanding Contributor
'03 SL500, '03 SL55, '97 SL320, (2) '91 300SL, (2) '91 500SL, '00 S500 -- all for sale
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4,231 Posts
New components naturally can affect how the suspension sits. Sasor, you probably need to adjust the position of the rear axle limit switch assemblies shown in the attached photo.

Each switch assembly has a mode selection switch on it with a position for normal operation ("funktion") and another for testing ("arretiert"). To adjust a switch, first jack-up the rear of the car so that the associated control arm is fully extended and tire is off the ground. Turn the mode selector to arretiert. Now loosen the switch assembly mounting bolt and position it so the tip of the switch just barely comes into contact with the covering on the control arm. Tighten the mounting bolt, return the mode selector to funktion, and lower the car.
 

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SL60 ///AMG
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110 Posts
re: 1990 500SL Installed shocks & struts..Roll bar pops up now????

bobterry99 is correct, but I think this should be done at the MB dealer, because this is a safety issue. If you get it wrong, the rollbar is´t poping up and you are going to get a headache (in best case).
 

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re: 1990 500SL Installed shocks & struts..Roll bar pops up now????

SL60 ///AMG - 4/13/2005 8:57 AM

bobterry99 is correct, but I think this should be done at the MB dealer, because this is a safety issue. If you get it wrong, the rollbar is´t poping up and you are going to get a headache (in best case).
This is really silly advice to give to a DIYer who has the competence to change the struts and shocks in the suspension of a 500SL. Sasorcomm if you go to the dealer for a simple adjustment to those switches, it follows that you should have them double check all of the work you did on the suspension. And just as you are ready to drive away from the dealer, have a tech come over and check that you buckled your seatbelt correctly (safety issue).
 

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'03 SL500, '03 SL55, '97 SL320, (2) '91 300SL, (2) '91 500SL, '00 S500 -- all for sale
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re: 1990 500SL Installed shocks & struts..Roll bar pops up now????

I don't know if I agree with the tone of the above post, but I strongly agree that Sasor should perform the adjustment himself. The axle switch adjustment really is simple and impossible to get wrong, I believe. My opinion is moot, however, because there is a test to verify the adjustment.

To check an axle switch, put its mode selector in the arretiert position. Drive the car to a speed of at least 6 MPH and apply the brakes fairly hard for a short stop. The roll bar should deploy. Lower the roll bar, return the mode switch to the funktion position, and repeat the preceding test for the other axle switch.
 

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1992 500SL
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Discussion Starter #8
re: 1990 500SL Installed shocks & struts..Roll bar pops up now????

Thanks to all of you for the advice...bobterry, as always, you come up with exactly the issue. The feedback that was received by all was valuable.

I certainly understand your advice and concerns, especially around safety SL60/AMG, it was valuable and please do not discount what you offer on this forum.

I will let you all know how it turns out and retest going over the turns that I know have caused the rollbar to go up under the normal circumstances.

If I am uncomfortable once I have done this, I will bring it to my trusted non-dealer MB specialist mechanic.

Thanks
 

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1990 300Sl, Porsche 993 Targa
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14 Posts
I just adjusted a switch on my car, just follow the instructions from Bob Terry, you can't go wrong :)
 

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'91 300SL(sold) 2000 SL320 Edition '94 E220 T auto
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Just to give people here an idea I bought them new in the UK at approx. £50 each so roughly equivelant to $100, not drastically expensive!
 

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Y2K SL500 Silver
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8,660 Posts
Where is the location of rear axle limit switchs that activates rollbar

New components naturally can affect how the suspension sits. ...... you probably need to adjust the position of the rear axle limit switch assemblies shown in the attached photo.
Bob, I was at my Independent Shop today and I asked two 20 year veteran MB Technicians to show me where my 2000 SL500 rear axle limit switch assemblies were located and they said that they are usually in the place where your above pictures shows them to be but in my case we could not easily find the switches. So, I left there scratching my head as to where they moved them and/or where they are located.

Is this one of those instances that since MY 99-02 they are now located somewhere else?

Thanks in advance for your reply. Bob or Anybody !!!!!
 

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'03 SL500, '03 SL55, '97 SL320, (2) '91 300SL, (2) '91 500SL, '00 S500 -- all for sale
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There are no axle switches on '96 and newer cars. At that time the roll bar control module was eliminated and its function was incorporated into the top controller electronics. The new electronics included a new sensor that obviated the need for the axle switches.
 
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