Originally Posted by 67Mustang Al.
I am going to try and bench bleed the thing with plugged outlets as i saw some guy demonstrating on you tube. He depressed the pistons slowly and waited for air to rise up.
The last M/C I installed on my '80 Malibu used that method. Plugs were used to completely stop flow from the outlet ports, then the piston was depressed gently and not fully to the rear stop to expel air from the reservoir feed ports in the bottom of the reservoirs.
But the way you had yours plumbed to bench bleed above was correct, as long as it was leak-free and tight.
Is there a chance that you weren't pushing hard enough on the piston to overcome the resistance of the larger spring that separates the front and rear valves?