The best replacement for hydraulics is pneumatics.

The best alternatives to hydraulics are rated as following:
★★★★★  pneumatics
★★★★  air ride
★★★★  airbags
★★  hydrology
★  air suspension
★  air bags
  bags
  closed center

Your alternative for hydraulics is not listed? Suggest!
Speaking about hydraulics, one probably shouldn't forget about big rims.

Other search terms related to hydraulics and their ratings are:
★★★★★ big rims
★★ cars
You have in mind a companion for hydraulics and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of hydraulics in all years. Click on graph for more.
hydraulics
pneumatics
air ride