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Bled rear brakes after putting speed bleeder on. Pumped about a cup and half of fluid thru. Reservoir is full but nothing showing in window. Brakes work but still little spongy. Scratching my head. Any thoughts?
 

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My thoughts are you don't have a C50 Boulevard. What bike are you working on?
 
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Bled rear brakes after putting speed bleeder on. Pumped about a cup and half of fluid thru. Reservoir is full but nothing showing in window. Brakes work but still little spongy. Scratching my head. Any thoughts?
Try bleeding the master with the lid off. Squeeze the brake lever slightly and watch the bubbles rise. Slowly, do this many times, and eventually it will bleed.
 

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Reservoir is full but nothing showing in window.
Not sure how that's possible. Some brake fluid almost has no color to it so maybe it's just hard to see, especially if it's a little over full.

If your bike still has the original 2006 brake line, the sponginess could be the rubber brake line is old and weak, expands when pressure it put to it.

.....and it could be air that you just haven't got to yet.
 

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Bled rear brakes after putting speed bleeder on. Pumped about a cup and half of fluid thru. Reservoir is full but nothing showing in window. Brakes work but still little spongy. Scratching my head. Any thoughts?

Nothing showing in the window? How can the reservoir be full, yet nothing show? Sounds to me like while doing the bleed you let the reservoir empty. Repeat the bleed, this time ensuring you never have less than a 3/4 full reservoir. i'll bet you have a big old pocket of air in there somewhere.
 
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