87 560 sel rear shocks
 

I have an 87 560 sel very nice but the rear shocks bounce like two children on a bad sofa. The hyrdo. res. is fill and the sls system has no leaks. I have never had the sls system befor. So what do you recomend That I do?????

Sounds like you have air in the system or the accumulators have failed. Try bleeding the system using the bleed port located in the control valve. If you do that and then the ride is "hard" the accumulators are shot. Replace them and re-bleed the system.