1969 brake master cylinder, drum/drum

1965 chevy c10 pickup, 1965 style power brake booster

Hi folks.

This has been the setup in my truck since I bought it, I have had to replace a few brake cylinders in that time.

This latest one though does not seem to want to work, so either I am bleeding it wrong or it is bad off of the shelf.

brake cylinder pic

This setup has the external valve thingy, before it goes down to the wheel cylinders.

I did the bench bleed before installation, no more bubbles. I mounted it up. I did the brake bleed, right rear, left rear, front right, front left around again.

Seems like it only has the rear brakes, which is why I was replacing it.

I did the crack all four bleeders at each wheel with a tube on them, submerged in brake fluid and slowly pumped the brakes... then closed them up.

Same deal.

Anyway... anything else to check or try again before I swap it out for another unit?

I am out of ideas at this point.

Thanks.

-Woog