Many users have reported lately that after they installed the OS update to 5.0.2 on their devices, their bluetooth pedals stopped working. This appears to be an OS problem, so there is nothing that can be changed in the software to address this. Additional information is available here: http://forums.androidcentral.com/samsung-galaxy-note-pro-12-2/551276-bluetooth-issues-after-5-0-2-a.html
If you have a Samsung device, particularly the Samsung Note Pro, do not install the 5.0.2 update if you use a bluetooth pedal. You will need to wait until Samsung releases a fix for this.