If you replaced the master start by bleeding it at the hose. Pump the clutch and while holding it down crack the line going from the master. Tighten the line and let up on the clutch. Pump, hold, crack, secure, release. 
Repeat until good fluid flow, then start on the slave. 

I just did one last week and had the same problem at first. 

-craig 

On Jun 16, 2013, at 3:05 PM, neil n <musomuso@GMAIL.COM> wrote:

> were the clutch master and/or slave replaced?
> 
> Maybe either is stuck in the downstroke position?
> 
> Maybe that would prohibit fluid flow?
> 
> Likely you're doing this, but make sure the fluid reservoir is filled
> up past the hose going to clutch master cyl.
> 
> Neil.
> 
> On Sun, Jun 16, 2013 at 11:34 AM, Keith Hughes <keithahughes@yahoo.com> wrote:
> 
>> Anyone have any tips for bleeding clutches that refuse to be bled? I
>> just replace all the hydraulics on my '86, and can't get the clutch to
>> bleed.  I'm using a pressure bleeder and 15-20 psig, but no cigar.
> 
> 
> 
> --
> Neil n
> 
> Blog: tubaneil.blogspot.ca
> 
> '88 Westy http://tinyurl.com/c8rlw6p
> 
> '81 VanaJetta 2.0 "Jaco"  http://tubaneil.googlepages.com/
> 
> Vanagon VAG Gas inline-VR Engine Swap Group:
> 
> http://tinyurl.com/d7gd5ej