Thread: SLS - Down to bump stops - no fault

Just got notification from DHL the bags are coming today, that is only 4 days delivery from UK...

The relay would trigger a fault code only if the problem is with it's coil, remove R5 and bridge the perpendicular cavities in the fusebox with a piece of wire, you should hear the pump then if it's OK... if you can't hear it the pump is dead or the circuit to it interrupted, if you had a bag leak the compressor could have over worked to compensate the leak and it ceded. even if the pump will kick in with bridged relay dont expect the bags to inflate cos the valves are closed

Sounds like the compressor has failed because of a badly leaking airbag,the compressors are not rated for continuous running just intermediate,when an airbag leaks continuously the compressor will first overheat and shut itself down until it reaches the stage were it is overcome with grief and then it will die completely.I would suggest that when your new bags come take one along to Pirteck or a place that sells small air fittings like a truck spare parts dealer and get them to set you up with a schrader valve so you can at least pump up the airbags and drive around.

What Lewy said.... pump first, rebuild kits are still available? change the hidden air filter..
change out the new bag hose fitting for a push-in connector and this whole gizmo is installed in minutes..
plus the LR thing of buying a special tool meaning you'll NEVER need it again!

Based only on my experience of 12 years of D2a SLS ownership over 140,000km, the airbag is the most common failure point. Around 10 years ago I had one of mine fail, and a second a year or so later. They were the original airbags and had done 13 or so years which I consider to be a long life for a rubber part. Recently I've had another fail after less than nine years - this to me is a tad premature. I'd expect that if I change them out every 10 years I shouldn't experience failure in them.

The only other SLS fault I've had was a ride height sensor failure which was causing it to drop the height. New sensor resolved this.

If you have a leak and continue to use the vehicle with it you can burn out the compressor leading to big replacement bill.

Originally Posted by sierrafery

The relay would trigger a fault code only if the problem is with it's coil, remove R5 and bridge the perpendicular cavities in the fusebox with a piece of wire, you should hear the pump then if it's OK... if you can't hear it the pump is dead or the circuit to it interrupted, if you had a bag leak the compressor could have over worked to compensate the leak and it ceded. even if the pump will kick in with bridged relay dont expect the bags to inflate cos the valves are closed

Thanks for this, am going to be checking it today, BIL coming around with the multimeter as well but to be sure if it turns out to be something else

Originally Posted by lewy

.I would suggest that when your new bags come take one along to Pirteck or a place that sells small air fittings like a truck spare parts dealer and get them to set you up with a schrader valve so you can at least pump up the airbags and drive around

.

Thanks for this, have gone and gotten the tee junction for $6.24 ( 4mm Pneumatic Push In Fitting Air Water Hose Pipe Connector | eBay ) and ordered some line to go with it. The Schrader fitting is proving a little more troublesome to find with the 4mm input....

By the way if others are interested in this, looked up the TMH and ebay tells me they are sold out -https://www.ebay.com.au/str/tmhtrading'mkevt=1&mkcid=1&mkrid=705-53470-19255-0&campid=5337614275&customid=&toolid=10001

Originally Posted by Pedro_The_Swift

What Lewy said.... pump first, rebuild kits are still available? change the hidden air filter..
change out the new bag hose fitting for a push-in connector and this whole gizmo is installed in minutes..
plus the LR thing of buying a special tool meaning you'll NEVER need it again!

Well, just opened said new conti bags and yes they do not have the push fittings, arrrrrgggghhhhhh. Appears there are two sizes available, either a 1/8 or 1/4 4mm push fittings, or should I get a fitting for the bag and connect this up, just don't know what that fitting is??????

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Originally Posted by twr7cx

Based only on my experience of 12 years of D2a SLS ownership over 140,000km, the airbag is the most common failure point. Around 10 years ago I had one of mine fail, and a second a year or so later. They were the original airbags and had done 13 or so years which I consider to be a long life for a rubber part. Recently I've had another fail after less than nine years - this to me is a tad premature. I'd expect that if I change them out every 10 years I shouldn't experience failure in them.

The only other SLS fault I've had was a ride height sensor failure which was causing it to drop the height. New sensor resolved this.

If you have a leak and continue to use the vehicle with it you can burn out the compressor leading to big replacement bill.

Yes had a Sensor snap on the Vic SA border track a couple of months ago, once I can get it lifted off the bump stops will be the first thing to check. The leak if it had happened would have only been for around 30k's (couple of drives to work) as the suspension was fine. The compressor was done late last year so crossing all fingers and toes it is fine.

Reason I did get the new bags was as you quite rightly point out, they can go before their time. That said so many large trucks are using this technology now and it is well and truly pretty reliable, but eventually they will go. Mine are at least 5+ years old now and appeared in very good condition last inspection , still, will change them out for long term peace of mind, but, if there is a leak, will at least have ONE good spare to pack away on trips.

Well this is interesting, a dilemma somewhat.. Circuits all fine, relay wiring etc., there was a loose connection in the compressor box, seating it in and putting the Nanocom trying to set heights, no go... As I noted in a previous post here, this issue would have only been in the last 30 odd k's of driving. Am a bit surprised that the light did not come on at all until we removed the relay, surely Slabs sends a signal as to not reaching target height.

Options

• Source 2nd Hand Compressor and Bagpipeandy kit for reassurance
• New, too bloody expensive
• Fit ARB Compressor and tank (less than price of Wabco and convenience of having a great tyre compressor onboard)
• Or potentially source another Wabco 2nd Hand Compressor from the following vehicles
• Audi A8/Q7
  
• Audi allroad
  
• VW Touareg
  
• Landrover Discovery 2
  
• Jaguar XJ Series
  
• Range Rover MK3-L322
  
• Mercedes S & C Class
  
• BMW X5 & 5 Series
  
• Porsche Cayenne
  
• And Others

Of course a rebuild if I can, but if the compressor does not make any noise at all, is this repairable?? Does the motor burn out or just the piston seize (I do know you can buy replacement pistons)?


Thinking I do have another compressor somewhere hidden no doubt behind all the other parts in the shed, or did I throw it away.

Does the ARB twin compressor fit in the tray or would it have to be located elsewhere?

just opened said new conti bags and yes they do not have the push fittings, arrrrrgggghhhhhh. Appears there are two sizes available, either a 1/8 or 1/4 4mm push fittings, or should I get a fitting for the bag and connect this up, just don't know what that fitting is??????

Remove the voss connector and fit a PC4-M8 push fit type instead, you should find in a pneumatics store in your area, this kind: Amazon.com: L-A PC4-M8 Straight Pneumatic Push to Quick Connect Fittings M8 Male x 4mm Tube OD One Touch Hose Connector for PTFE Tube 3D Printer Connector（10 Pcs） : Video Games ... i digged out the M8 thread from my memory but i'm not 100% sure so you'll have to undo the voss connector from the bag and make sure beffore you buy if that's what you want....or swap the connectors from your old bags if those are push fit into the new ones