300SEL suspention question - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 06-27-2012, 07:43 AM Thread Starter
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Date registered: Jan 2006
Vehicle: 1996 W210 E320 ELEGANCE, 1972 W108 280SE 3.5, 1969 W108 280S, 1971 300SEL 3.5
Location: Melbourne, Australia
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300SEL suspention question

Hi all,

Last Friday I inanvertantly accidently on purpose rescued/bought a 300SEL 3.5.

Anyway since this is the first air suspention car I've ever owned (I also own a 280S and a 280SE 3.5), I have a couple of questions on the operation of the system. I spent last night reading all the posts in the forum regarding the suspention on these cars.

The car was purchased in Albury and after waking her up from a 8 year slumber on Monday, I promtly drove her back to Melbourne (with back up) a total distance of 318klm or 197 miles.

Other than the near new looking tyres all having flat spots from sitting around causing the car to vibrate I felt the suspention to be very wollowy, even at 60mph that I was travelling at for the duration.

With the car safely back at home I was going through the various dials and knobs till I got to the height control knob at the kick panel, I pulled it all the way out (I felt the indents) and I waited for the car to raise up to it's highest point with the engine running, and nothing happened, I checked all the positions and there was no change, the front drops down over two days, not the rear and when the car is started the front comes up, there is no change in the rear height.

I am slowly going through the car, but any ideas and help would be great to get me started on the right path.


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post #2 of 4 (permalink) Old 07-02-2012, 01:49 AM
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Date registered: Oct 2008
Vehicle: 73 450 SE Euro
Location: West Covina, Ca
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I had a 300 and recall having same problem could be a rubber air hose leak (you have 3 on Driverside) or air lines up to front airbags they have a sealing o ring inside fitting. Check with a water spray bottle add liqiud soap and spray liberally should bubble up around air leak. Also can leak around main unit that has cable control valve. Got a factory repair manual with all proceedures but its for ealy models but dont think thres any diffrence other than hoses etc.
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post #3 of 4 (permalink) Old 07-03-2012, 08:10 AM
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Date registered: Dec 2003
Vehicle: 1965 220S, 1999 Volvo V70 (wagon), 2006 Ford Crown Vic Police Interceptor, 72 350SL 4 Speed
Location: Near Manassas Va.
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Greetings and welcome the the air suspensioned world. I would suggest you visit The International M-100 Group which caters to the 300SEL 6.3, 6.9 and 600 M100 powered cars MB made.

There are quite a few 300SEL 6.3 owners in Australia who are quite expert at fixing them. Your car and theirs are the same, except for the engine, and you can get a lot of good info there. There are many threads about the air suspension, the leveling valves, the compressor, air tank, the distribution valve etc etc etc.

There are also articles with many pictures on air suspension overhaul.

I'm not trying to kick you off this site, but the M100 site hase much more expertise on this complex and reliable system.

Near Manassas Va. '65 220S, 2006 Ford Crown Victoria Police Interceptor, '99 Volvo V70, '72 350SL 4 speed

Not part of the in-crowd since 1952. It's BRAKES not breaks. You break a bone, use brakes to stop your car. /rant

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post #4 of 4 (permalink) Old 07-03-2012, 02:22 PM
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Date registered: Oct 2006
Vehicle: 1965 220SE sedan (finnie) with 450SE conversion, 1964 220SE coupe project, 1966 300SE coupe
Location: Brisbane Australia
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Hey Peter,
Talk to Ron Bunting (briskiwi@bigpond.com.au) in Brisbane
and Chris Stewart (bikesncars@optusnet.com.au) in Melbourne. These guys know who to send what to, to get them right. Ron will help me with my W111 coupe that I have bought 6.3 parts for, plus my W112 coupe.

I am going to go with aftermarket larger nylon air lines and valves, but Ron reckons the factory stuff is fine if you don't want to dump it and raise it a lot. My understanding is that the system is expensive to get right, but if done properly, you can rely on it for quite a long time.
If you join Ozbenz, 'treedoc' on there did exactly the same thing as what you are about to last year, so he would also be a good resource to chat with.
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