Under "normal operating conditions", the only thing that prevents the brake pads from closing in on each other is the brake disc & its movement; since activating the master is like pushing the brake pedal, you, effectively, applied the brakes numerous times without the disc holding the pads apart; what you need to do now is reopen the pads by prying them apart &, in turn, pushing the caliper piston back...
In most cases, the only way to do this is to open the bleed nipple on the caliper to release the excess pressure/fluid, as the master cylinder will, most likely, have a non return valve, preventing the excess fluid from returning to the reservoir...
In short, yes, you need to "bleed" the brakes:
- open the bleed nipple
- pry apart the pads until the piston is seated as far back as it can go
- close the bleed nipple while holding pressure on the pads (to prevent air entering the caliper)
- fill the master cylinder fluid reservoir to the recommended level...
I wont be pumping my maa... lol had to stop myself. I started to chuckle. I've got a dirty mind and severely lacking sleep. Anyhow I wont do what the op did but it's sound advice incase somehow when I get my hydraulic brakes they end up closed. I probably woulda tried that way anyway but step by step instructions help. Guess there's no fitting a good ol "C" clamp in there to comprrss the piston on a car caliper huh? This nice weather we've been having I cant wait until my build is done
