Posted this in the E-class section as well.

I just bought this car for my wife, I replaced the front brakes complete with help from you guys. Thanks! the car drives like new.

The rear suspension is sagging a bit, 140,000 miles. Any cheap and easy ways to help this?

 

You'll need a Klann or similar spring compressor (I think Sir Tools has a clone). A standard hook type won't work.

Some will tell you there is no need for a spring compressor - just get the lower arm on a hydraulic jack, take the inner arm attachment bolt out, and let the car down on a stand. Bad choice - very dangerous.

You can buy new springs on line at a place like autohauz, buymbparts.biz, allparts, etc.

Or you can get lucky like I did and find a local guy that lowered his car from the get go and kept the original springs for spares, then sold the car. I was lucky like that.