My 2012 Cruze 1.4 with manual transmission has 150K miles and yesterday I was driving and felt a little jerky. the shifter felt lso have a little hesitation getting it in a gear. So I continued driving and as I got on the highway entrance ramp at around 50mph the car when into a neutral condition with the shifter still in 5th. I switch into another gear but no gears engaged - all aced like neutral. the engine rpm increase but no acceleration at all. I glided o the shoulder with engine still running and stopped. I could no move in any gear and also reverse. It seems I can now move the shifter to any position without depressing the clutch with the engine running. I turned off the car and sat there ac couple hours waiting for the tow truck. As I waited about 1 hour started the engine depressed the clutch shifted to 1st an attempted to move. The car moved slightly fporwad then stopped and started rolling back while still accelerating. A week ago I did change my front brakes and had to add Brake fluid and used an all an of fluid I had Dot 3 I think but don't know if this has anything to do with this problem. Brake reservoir is also for clutch on this car... Is this problem the cutch, Manual Transmission, or just Clutch Master cylinder? one more thing manually shifted the gears with the linkage on the tranny and the shifter did move into the respected gear location as I did this.