Brake help.., Need a different opinion than my own. Options

[ClayPerrine]

I am having problems getting the brakes to bleed on my big six. It has Boxster calipers, a 23mm master cylinder, and no proportioning valve. I can't seem to get a pedal. After about 3 pumps of the pedal, it comes up and there is decent pressure. But the minute you let off completely, it will go to the floor the next time the pedal is depressed. I have put over 2 liters of fluid through the system already, using both a power bleeder and Betty's right leg. Fluid is ATE Dot4 gold.


This is the same setup I ran on it for years. It has always had good pedal, no issues with bleeding it either.

Anyone got any suggestions on what might be wrong?

[raynekat]

I'm another ignoramus. Did the same thing just a couple of days ago. Tried bleeding the brakes and got nice bubble free fluid coming out of each caliper.
Yet no brake pedal. Dang air in the system somewhere....either the master of the P/V I thought.

A friend stopped by yesterday and while I was showing him the car, he noted "you bleeding the brakes?"
Yeah, but I can't get a brake pedal.
So he helped me to quickly go through the procedure again.
When we got to the front brakes and I had bled the 1st side, he asked me if that was the inner or outer bleed valve?
Inner or outer? Oh boogers!
Yeah, these dang S calipers do have inner bleed valves don't they....
Son of a gun.

Long story short, both front inner bleed valves were holding back some air.
Once bled out, I finally had a firm brake pedal.

Sometimes you can't see the forest for the trees....or is it the other way around?