I recently joined the cheap wagon club and purchased a wagon that had a new SLS pump - the PO had let the system run dry so I rebuilt SLS valve, replaced high pressure line and added new Mercedes hydraulic fluid (Febi) Upon start up with weight in the rear, the car's rear end rises up and then drops slowly and repeats this 2 more times and then stabilyzes at the right height compensating for the load and maintains height . . . is this normal for the SLS system? Any thoughts, seems like the car needs a few extra seconds to pressurize -??

No. Air leaving the system would be my guess.

Is there any air in the lines?

How are the accumulators?

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D

system is self bleeding, no leaks and accumulators appear to be original and car does rise . . . .might be time to change out accumulators regardless

How long ago did you reseal the valve? If it hasn't been too long, I'd give it a few times of being loaded down. There may still be air in the system and it needs to be bled out.

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How does the car ride?

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles

Car rides good though I notice when I come to a stop car lowers and raises . . hey man, I am an official low rider now! there seems to be a pressure loss somewhere. . . .

The only thing that can cause the rear to raise and lower like that is the SLS valve. The pump supplies the pressure to the valve but it's not going to change the ride height. Are you sure you got it put back together correctly and/or non of the o-rings got damaged while putting them in.

I reworked the SLS Valve O-ring PDF here it is again.
http://oregonstate.edu/~lindgrea/DIY/PDFs/w123_sls_valve_seal_inst.pdf

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I feel very confident that the SLS valve went back together perfectly no damaged o rings etc - I may change accumulators and see what happens as they are quite old and original -

Accumulators generally cause bouncy or harsh ride. They aren't going to cause the rear to lift and lower randomly. When they go bad the big rubber diaphragm inside tears and the whole sphere fills with fluid. Ride height is only affected by the pump and the valve. I still suspect the valve. You might have a valve that isn't working right.

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Can you make it junp up and down at stop lights?

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OBK #55

1998 Lincoln Continental - Sold
Max 1984 300TD 285,000 miles - Sold
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2002 C320 Wagon 122,000 miles
2016 AMG GTS 12,000 miles