Having an issue with the brake flush on my 360. 2001 360 F1 spider. Motive Power Bleeder. Used multiple times on my prior F355, 348 etc with no issues. Simple and easy to set-up and use. My 360 appears to be a different story! Attach Power bleeder. Check pressure. No drift, holds. Brake fluid in power Bleeder. Pressure to 15psi. Open bleed screw. Little or no fluid. Repeated attempts at different wheels. Same result. Shop flushed 2 years ago, fluid looks fine. Everything clean. I assume pilot error. Help appreciated!