zed2 Posted December 19, 2021 Share #1 Posted December 19, 2021 Please help me identify the brake master cylinder in the attached photos. (I believe the brake master cylinder is for the 1969-8/1971 240Z part number 46010-E4602.) I obtained several NOS parts from a foreign car repair center several years ago. The owner could not verify the part number of the BMC. Thanks, Keith Link to comment Share on other sites More sharing options...
Zed Head Posted December 19, 2021 Share #2 Posted December 19, 2021 (edited) It fits the drawing and the specification (7/8") perfectly for a 1972 MC. Page BR-3 and -27. The 70 FSM matches it also. Edited December 19, 2021 by Zed Head Link to comment Share on other sites More sharing options...
Zed Head Posted December 19, 2021 Share #3 Posted December 19, 2021 73 flips front and back. Link to comment Share on other sites More sharing options...
zed2 Posted December 19, 2021 Author Share #4 Posted December 19, 2021 Zed Head, Per CPM (https://www.carpartsmanual.com/datsun/Z-1969-1978/brake/brake-master-cylinder/from-sep-71) the post 08-1971 is below. Note the positioning of the forward most reservoir is behind (in reference to the front of the vehicle) of "R" line connection The Page BR-3 and -27 show the forward most reservoir is forward (in reference to the front of the vehicle) of "R" line connection Link to comment Share on other sites More sharing options...
zed2 Posted December 19, 2021 Author Share #5 Posted December 19, 2021 10 minutes ago, Zed Head said: It fits the drawing and the specification (7/8") perfectly for a 1972 MC. Page BR-3 and -27. Zed Head, Did you just edit your original post image? Keith Link to comment Share on other sites More sharing options...
Zed Head Posted December 19, 2021 Share #6 Posted December 19, 2021 1 minute ago, zed2 said: Zed Head, Did you just edit your original post image? Keith Added this - Link to comment Share on other sites More sharing options...
Zed Head Posted December 19, 2021 Share #7 Posted December 19, 2021 5 minutes ago, zed2 said: Zed Head, Per CPM (https://www.carpartsmanual.com/datsun/Z-1969-1978/brake/brake-master-cylinder/from-sep-71) the post 08-1971 is below. Note the positioning of the forward most reservoir is behind (in reference to the front of the vehicle) of "R" line connection The Page BR-3 and -27 show the forward most reservoir is forward (in reference to the front of the vehicle) of "R" line connection The Nissan Factory Service Manual is where I got the images. Choose your source. Link to comment Share on other sites More sharing options...
Zed Head Posted December 19, 2021 Share #8 Posted December 19, 2021 (edited) Interesting how far off the two are, time-wise. Not sure what's going on there. The FSM's I downloaded from this site or others. The 72 FSM files come with a cover image that says 1972. Somebody on the forum will know what's what. Might be that the change happened in 1972. The build date is what you see in the cparpartsmanual data. August/Sept 1971 is the changeover. Maybe the 72 FSM did not keep up. Edited December 19, 2021 by Zed Head Link to comment Share on other sites More sharing options...
Zed Head Posted December 19, 2021 Share #9 Posted December 19, 2021 1 hour ago, zed2 said: Please help me identify the brake master cylinder in the attached photos. (I believe the brake master cylinder is for the 1969-8/1971 240Z part number 46010-E4602.) I obtained several NOS parts from a foreign car repair center several years ago. The owner could not verify the part number of the BMC. Thanks, Keith In short, I think that your assumption is correct. Link to comment Share on other sites More sharing options...
zed2 Posted December 19, 2021 Author Share #10 Posted December 19, 2021 18 minutes ago, Zed Head said: In short, I think that your assumption is correct. Thank you...I do not want to sell a part for which the application is in doubt. Keith Link to comment Share on other sites More sharing options...
Terrapin Z Posted December 19, 2021 Share #11 Posted December 19, 2021 Also of note in the drawings is the location of the stopper screw. Early has it on the side #19 Late has it on the bottom #17 I concur that it is an early M/C GLWS 1 Link to comment Share on other sites More sharing options...
w3wilkes Posted December 20, 2021 Share #12 Posted December 20, 2021 (edited) Assumption: early car and a late M/C... The external difference from early to late is the size of reservoirs that are swapped. What's the internal difference? What would happen if you swapped the late reservoirs to the early reservoir positions and hooked the rear brake line to the front M/C position and the front brake line to the rear M/C position? Edited December 23, 2021 by w3wilkes Link to comment Share on other sites More sharing options...
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