Just went through this a few weeks back. Here's what we did upon valuable advice from "cool" and others. Disconect rear lever and move lever to max height position; rev engine up to 1,500 rpm until suspension raises; then move lever all way down and put pressure down on the runk until suspension drops all the way; you can hear the air coming out of the lines; repeat procedure 2-3 times until air does not come out any more. Replace nut and tignhten up lever before driving away. Mine took 4 lever up-lever down tries until all air came out. Suspension leveled at right height and drove it in the freeway about 20 miles to get some good suspension bounces and it works like a charm now. My 2 cents worth; suspension should not be adjusted all the way up for normal driving as you mechanic suggested.