Just joined so hope I'm doing this right.   I have a 1970 240z that I've owned for over twenty years.

Has been carefully stored for the past ten years but not driven.  Replaced rears wheels cylinders and bled brake lines and they work fine.

Then discovered front calipers were locked up so replace with new  (Rebuilt ) units.  Carefully bled the master cylinder again as well as the front brake lines but calipers not working.   Should I now replace the master cylinder ?

Check the bleed screws.  Pretty common for people to install the calipers with them on the bottom where they're easy to reach.  But they need to be at the top where the bubbles are.  The calipers can be swapped.

Thanks, I got the rebuilt calipers from zcardepot, they came in separate boxes and were clearly marked for left side and right side. I replaced the calipers one side at a time and the new ones were identical to the ones I took off so there was no mixing them up. I agree it looks like it would be possible to put the left one onto the right side and vice versa but regardless, the bleed screws would still always be at the bottom.  Am I missing something?   I did bleed the lines thoroughly  (with the old two person method)  and there are no air bubbles.  

Rear drum brakes work great.  Is it possible that one side of my master cylinder is not functioning properly? ?

If you swap them the bleed screws will go to the top.  If they're on the bottom that's your problem.  It's a common problem.

After closer inspection, I think you are correct.  Looks like they rebuilt units were labeled incorrectly.  Thanks !

I am getting this car ready to finally put it up for sale.  I've been active in restoring other types of cars so have never connected with other 240z owners.  I see you aren't too far from me, is there a club I should consider joining ? 

Oops, I didn't read the full message.  Things have slowed down, forever.  Datsuns Northwest has closed their doors.  Not looking good for car clubs.  Maybe the Seattle area.

But it looks like somebody will be organizing the occasional cruise or meet.  So, keep the site in mind.

 

Probably these guys, Datsuns Northwest.  I never joined but the Canby show was/is always a big deal.  Things have slowed down a bit since I got in to the game but that doesn't mean they'll stay slow.  Worth a look.

http://datsunsnw.org/

Edited April 20, 20205 yr by Zed Head