I have a 2007 r500 with rear air suspension only, over night the rear right suspension sags to the ground and left always stays up, I have switched level sensors from left to right to see if problem moves to the left side but that did not change anything. I repl right air bag with one from arnott industry. I vacuum tested the line from distributer valve to rear of vehicle the line holds vacuum, I performed a dtc readout no codes. I also repl airmatic brass fittings and repl front distributer block, I leveled car out with star diagnosis overnight the car still sinks to the right . Any ideas would be great il thank you

Most likely the rear air level valve block.

Internal leakage,

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Thanks for reply the rear level valve bock is in the front and I repl it already unless there is a hidden one

Only 2 things allow the suspension to leak & go down.

1) external leak at the air spring

2) internal leak at the valve block

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

I'm starting to see the early 251's come in with sagging suspensions. The most common fault I've found is leaking air springs. Try spraying soapy water into the folded section of the spring and you should be able to spot the leak. I've had a few with very slow leaks that I removed and inflated with compressed air so that the spring is fully extended. You don't need to inflate it to 100 PSI, just enough to extend it. I've found that they normally leak at the folded/creased section. Good luck.

Mine's sagging in the right front. Makes funny noises occasionally. Light on dash warns to wait until it rises up a bit. Wondering if MB will cover it since I'm just over warranty or if it will be big $$$$

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Bob Roe
Lehigh Valley PA USA
1973 Olds 88, 1972 MB 280SE, 1978 Datsun 280Z, 1971 Ford T-Bird, 1972 Olds 88, 1983 Nissan Sentra, 1985 Sentra, 1973 230.6, 1990 Acura Integra, 1991 Volvo 940GLE wagon, 1983 300SD, 1984 300SD, 1995 Subaru Legacy L wagon, 2002 Mountaineer, 1991 300TE wagon, 2008 Murano, 2007 R320CDI 4Matic 52K, some Hyundai, 2008 BMW 535xi wagon, all gone... currently
2007 Honda Odyssey Touring, 2014 E350 4matic

I also had a sagging right rear end, and after swapping the air lines at the control valve to see if the problem changed sides, I replaced the right rear air bag. If I remember right, it was in the neighborhood of $500.00

Hi , any body have info video or photo how to remove and replace rear air spring 2007 R500 ? Thanks in advance

just disconnect airline , it deflates, , there is a plastic bushing at top , it will likely break upon removal, just pull down , and lift out simple to do.and install new bushing clip