Question about 2003 Mercedes-Benz S-Class

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S class air suspension

2002 s class the front suspension goes down if left 4 3 days at the front only,when u enter the car the back goes down and it will pump itself up in approx 1 min ,is this normal

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  • GreasMunky May 11, 2010

    out of the several different models available within the S class you should include specifics so people can help you better. The S class is plagued with suspension problems and most of the time the owners option is to either repair the existing, stock, air system (which gets EXPENSIVE) most of the time independent mechanics and dealerships will often mis-diagnose or incompletely diagnose the cause of a problem within the suspension only to have to bring it back to them a couple weeks later to get re-repaired sometimes until every component within the system is brand new (can range anywhere from $2500-$3500) individual components can also be expensive to only work for a couple of weeks because the CAUSE of the problem was not properly attended to.

    The other alternative is a conversion kit. But do your research!!! a conversion kit is basically converting you from your over engineered, unreliable air suspension system to a simpler, more reliable, passive coil spring suspension. BUT a spring is not JUST a spring. We install kits from Strutmasters.com as they come with a lifetime warranty. They only take about an hour to install (very easy, custom assembly) They are powder coated AMERICAN steel coil springs that have never been reheated or modified which will negatively impact the intregrity of the steel.

    We haven't had any complaints or returns on these installs but have received several calls and letters from customers to express their satisfaction. We get so much business from word of mouth referrals since we started our new approach. We diagnose the problems and lay out the potential solutions for the customer. We explain the possbile benefits and drawbacks of each solutuion and let them make the decision they would prefer instead of feeling pressured into ONE specific solution.


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With the cost of maintaining the air suspension on a Mercedes S-Class being in the thousands, wouldn't it be a better move to do a Mercedes S500 Air Suspension Conversion RWD and spend your money on cool stuff......rather than car repairs?

Posted on May 07, 2015

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Level change up to 20mm in 24 hours is normal.
if after start car returns to normal level you do not have problem yet.

Posted on Oct 24, 2009

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Service air ride suspension


Sounds like the valve body for suspension system or a front air hose leak.

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AIR SUSPENSION LIGHT STAYS ON THEN BATTERY COMPLETELY DRAINS IN A COUPLE OF DAYS ON 2002 LINCOLN TOWN CAR HAVE REPLACED BATTERY AND RELAY SWITCH STILL DIES AFTER A COUPLE OF DAYS


It's possible you have a leak in the air suspension and the air compressor is trying to keep it aired up which is draining our battery. Disconnect the power from the air compressor for a couple of days. If your battery still goe down, then the problem is somewhere else. If you do have aleak, then the air suspension will probably be bottomed out by that time, but your battery should still be good.

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My rear suspension sags after 3 min of operation.The check air suspension light comes on. It goes off if shut down/ start the engine,Some one told me to change the shocks,what about the check light on...


Air suspension bags are probably leaking. air comp shuts off after 3 minutes because its working to hard. since bags are leaking rear than sags. This car has bags instead of shocks in rear. light comes on when comp turns it self off.

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2002 rangerover vogue petrol nearside front suspension goes down overnight any ideas to put right please


I expect this has an air system within the suspension allowing you to vary the ride and its height. If the suspension is dropping overnight this would be from a leak within the system or a valve that is allowing air to bleed back and leak out. You'll have to locate the leak which may be in one of the shocks/air bags. Being these are tied together by a common system if one were to leak the pressure in the system will equalize causing the entire system to lower its pressure. I hope this may have assisted,
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2002 linncoln towncar where is the air supension compressor relay switch,please.


Air suspension needs compressed air for the control of Air Springs (Air Spring is a cylinder like thing which goes up and down when air is pumped in and out of it). For pumping in and out the air, air compressor needs to be switched ON/OFF. Compressor relay connects and disconnects the compressor motor from the power supply ( battery). ----------------- air ride suspension compressor located under the air filter box . ---------------- the Air compressor clutch relay location
is fitted to the left hand inner wing (when viewed from the the driving seat).
-------------------
the compresser is located on the left hand side of the car under the hood.
once you open the hood remove the air cleaner housing and windshield washer resivor.
there is a panel that you lift up under both of thoese that is where the compresser is located
-------------
  1. The air suspension uses a small, separate air compressor under the driver's side left fenderwell, with air lines running to the air bags. On the top of each air bag is a electrical valve. This is a relief valve that allows air to be exhausted when activated, and which senses the amount of air pressure within the air bag to keep both sides equal. These valves are operated via a leveling sensor that is attached to the body of the car and to the rear axle by a movable arm. When the rear of the car drops due to increased load, the arm is pushed up. When the arm is pushed up, it turns on the air compressor and fills the air bags to level the car. When the load is removed and the arm moves down, indicating that the back of the car has risen, the sensor opens the valve on the air bags and allows air to escape, lowering the car.
  2. If the back of the car is low, indicating that the air suspension is not working, and the air suspension light is on, check the fuse first. If the fuse is all right, check the air suspension switch in the trunk and make sure it is on. This switch is used when the car is in for service. Always turn off the switch before lifting the car, because the sensor will think the car is rising and keep the air bag valves open, ruining the rear air suspension.
  3. Turn the ignition key with the engine off. Listen for the compressor to come on while pushing down on the rear bumper. If it does not come on, test the switch terminals for power, using a circuit tester. If one terminal has power and the other does not, replace the switch. If there is power, turn the switch to the off position, raise the vehicle and place it on jack stands in the rear. Inspect the leveling switch on the axle, making sure it is not bent and is connected. Use an ohmmeter for this test. Pull the electrical connector off the switch. Loosen the arm of the switch from the axle. Test the switch with the ohmmeter by checking across both terminals while slowly moving the arm. There should be no continuity with the arm down. As the arm is raised, there should be continuity. If not, replace the switch. If there was continuity, connect the arm and the electrical connector.
  4. Put a floor jack under the axle and raise the axle to the point where it is just beginning to lift the car off the jack stand. Turn on the ignition. Turn the air suspension switch to the "on" position. Use the circuit tester to check for power at the leveling switch. If there is power, turn the air suspension switch to "off" and lower the car. Access the air compressor in the front, under the hood, and check the electrical connector for power. If there is power, check for a good ground. If both are good, replace the compressor. If the compressor works and the car does not rise in the back, replace the air bags.


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1 Answer

The rear suspension is down on my 1999 Ford Expedition - Eddie Bauer. The cause: while out in the woods I came across a small dip which cause my back left wheel to lift off the ground. The suspension...


I had a 1999 Expedition. When you put the 4x4 on it raises the vehicle an extra inch or 2.
It may help to turn the 4x4 off. Two wheel drive is a lower air setting.
Your original pump may still be good. The problem can be in the front. The compressor is not filling the front suspension to the cutoff point. It will lift the rear after the front end is at running height. Since you lost the front end first, the remaining air bled out there and then the rear came down. Once you shut down the car the suspension was done, all the air was let go.
There are adjustment solenoids on the body but you need someone qualified to repair this.

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1 Answer

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I would suspect it is the rear height sensor,the link may have come unhooked or it may be sticking or just bad.

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