BMW - Hydraulic Power Steering Hydro Gear Box, Leak Repair Service. E24, E28, Rebuild is $295.00 +RS+Ins and Bench Bleed using ATF. (see purging the air) page 5. Just added, e31/e32, 750/850, Hydro Rebuild is $329.00+RS+ Ins, from 9/91-6/94, for the e31 cars. Includes Lash adjustment, and Bench Bleed, with Petrosin. Painting of your Hydro is $95.00, includes paint removal, Also added, . My Info: Jay Stratton, 2514 North Tustin Ave. Unit E, Santa Ana, CA. 92705. my e-mail, jaycstratton9@gmail.com scroll down