My bike is a 2001 ST1100 ABS that has sat over 10 years. The front brakes apply and release. The rear doesn't do anything when I try the foot or hand brake. I have since replaced all the pads which seem to have even wear. I cleaned and pushed Pistons in to replace the pads. I did crack the bleeder valve to get the rear piston to go in. I have reviewed the sequence and am going to flush the brakes. My question is do you think there is an issue with the rear master cylinder or will I get lucky enough that a flush will get it going again?