Join Date: Nov 1999
Location: Central California, USA
The rear replenishment port between the reservoir and rear piston has a valve in it to prevent fluid from returning to the reservoir until around 100 psi is reached. This allows the large rear piston to move a lot of fluid upon initial pedal travel.
Once 100 psi is reached, the valve opens and the smaller rear piston starts pumping fluid into the brake line.
When bleeding, the reservoir valve interferes with fluid replenishing the rear bore. You have to wait a while after each pump of the pedal until the fluid has time to fill the bore.
The manual says wait 30 seconds for each pump, but this might vary depending on your particular master cyl.
The front MC port should bleed normally.
Check my web page for First Gen Camaro suspension info:
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67 RS 327 original owner. 1965 Lola T-70