Hydro disk brakes on Vinny have me dumbfounded

[brd812]

I need some advise, I have a 03 Suzuki Vinson 500 shifter. I've had it since new , its my swiss army quad. Last summer the brakes were getting soft so I put pad on the back, replacing the original . Things seemed back to normal all winter as I use it for hunting and plowing and this spring I took the plow off and took it with me trout fishing with me last month. During a rainy day I went mountain goating and I noticed I had hardly no rear brakes and they wouldn't lock up at all.. oh boy ... Had some time this week and tore into them and everything seemed ok , no leaks, the ebc pads still looked new. I'm lost now, I bled the line so it has all fresh fluid, no air in the line, now its even worse. I cant get any hydraulic pressure at all. Is the master cylinder, the caliper is moving freely and not leaking. I've playing with this and never had this issue ever before, Ive ripped lines and warped rotors before on other bikes and I never ran into this. Any ideas? This thing use to have rock solid rears. I'm lost,

[torker]

Your rear caliper needs to be rebuilt...

TORKER.

[atc007]

These can make a great tech pull their hair out. Start bleeding at the master. verify you have zero leaks anywhere !! Pump and bleed at the 12mm bolt where the line comes out of the master. Bleed till it is solid fluid. Then bleed on the 12 at the end of the line at the caliper. Bleed till solid. Then and only then, bleed at the bleeder. After you are absolutely sure you are bled solid. You should have a rock solid pedal. If not investigate the caliper. New ones on ebay are $54,used $20 ish. I highly suspect you will be G2G after a good bleed. Nothing to it using these steps.