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Hydraulic Disc Help - Should I bleed / refill?

Hi Folks, 

Apologies if this has been asked dozens of time but i've checked and couldn;t find a similar thread. 

I recently swapped out my front disc pads which had completly worn away. In trying to reset the pistons (push them back in) i found myself playing with the brake lever which the disc out and bike upside down. One of the pistons nearly popped out, but i pushed them back in as far as they'll go. Trouble is, the brake lever now doesnt generate enough pressure to apply any braking force onto the disc. 

Have i broken it or do i just need to bleed the brakes and replace the fluid? 

In normall circumstances, i would leave something like this to the pros, but the workshop is booked up for the next month. 

In case it matters, the brake system is Shimano RS685/805 and i've had the bike for around 4 years and haven't done any maintenance on the brake.

Will someting like this kit do the trick?

If you're new please join in and if you have questions pop them below and the forum regulars will answer as best we can.

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