Suggestion: use NAPA parts supplier rather than Autozone next time.

3 hours ago, Pilgrim said:

Suggestion: use NAPA parts supplier rather than Autozone next time.

I wish we had Napa in our area.

If you get your money back Rockauto doesn't require a core return, https://www.rockauto.com/en/catalog/nissan,1973,240z,2.4l+l6,1209170,brake+&+wheel+hub,power+brake+booster,1884

15 hours ago, Trimpe.bob@gmail.com said:

I wish we had Napa in our area.

I'm not a snob about these things, as I sometimes use Autozone, but I agree that Rockauto would offer more options and quality levels of parts if you don't have NAPA around.

19 hours ago, Trimpe.bob@gmail.com said:

The booster is from Autozone. I sorely regret turning in the core. The was a lock washer and seal in the unit. I took them out.

since I have it out, and it came with a warranty, I may see about getting a replacement, just because. 

The auto parts stores are all used to accepting returned reman parts.  Just take it back and ask if you can look at the other units that they have in stock.  You'll probably find one that looks right and they'll just swap it, no problem.  Defective reman parts is normal.

I took the booster back to autozone. He will get me a new one, probably be here on Monday. I’ll let you know what develops.

Once you get the replacement, I suggest you confirm the reaction disc is in there and glue it on if it is not already. 

I hope this all works out well for you. I think it is safe to say we have all encountered similar problems with these cars and have worked through them to fruition.

Somebody on the forum used one of these depth setting tools.  They're pretty simple and you get it right the first time.  You could probably make your own.

https://techtalk.mpbrakes.com/power-brake-booster-depth-gauge-tool

Conedoger I believe...

Thanks for this thread. I was having some similar questions and this was very helpful

Well, I got a new booster, and it behaves exactly the same. 😐

Is it possible this is an adjustment issue? I can see rod lengths causing high or low pedal, but not this all-or-none action.

1 hour ago, Trimpe.bob@gmail.com said:

Well, I got a new booster, and it behaves exactly the same. 

Did you check it for a reaction disc?