Topic: Master Cylinder ID and Bore ?

[Brian Conway]

      How to ID a correct OE Disc brake master cylinder ?   The cylinder bore size for a 65, San Jose, GT car built about mid May 65 ?      Thanks,  Brian

[mgmradio]

An original 65 master cylinder will have brass adapters with the seats screwed into the outlets. In 66 they changed them and put the seats in the ports.

[Brian Conway]

     Thank you for the info on the seats.  Appears this master cylinder is a 66 version, has a 15/16" bore and some cast info on the down side.  That info is;  2225052  ?R5  and what seems to be a date code 2 8 5.  Mean anything ?  Brian 

[Brian Conway]

     Thank you for the info on the seats.  Appears this master cylinder is a 66 version, has a 15/16" bore and some cast info on the down side.  That info is;  2225032  ?R5  and  a date code 2 8 5.   

     I have learned, credit Chockostang, that the 222 identifies a Bendix unit and that the ?R5 is the Bendix logo a winged ' B ' R5.  Still don't know what the BR5 means and not sure how to decode the date casting but am going to guess; Month, Day and year.  Have a picture, pretty dark, but could this be the original Master Cylinder for my 65 ?   Opinions ?  Brian

[Brian Conway]

I'd like to re visit this topic ?  The master cylinder is off the car and I have some more info.  It appears it is the 66 version with seats installed in the ports ?  A Bendix unit with a date casting of 2 8 5.  Same question OE or not ?  Thanksgiving day riddle.   Brian

I have been told that Bendix used the Julian Calendar method to date their master cylinders.  Makes sense because that is the method used on the K/H proportioning valve.   So 285 th day or Oct. 12, 1964 ?  Brian

[Brian Conway]

Thank you Autolite for the additional information.  My car, May of 65, would be in the later 65 production year.  Brian

[Bob Gaines]

I'd like to re visit this topic ?  The master cylinder is off the car and I have some more info.  It appears it is the 66 version with seats installed in the ports ?  A Bendix unit with a date casting of 2 8 5.  Same question OE or not ?  Thanksgiving day riddle.   Brian

I have been told that Bendix used the Julian Calendar method to date their master cylinders.  Makes sense because that is the method used on the K/H proportioning valve.   So 285 th day or Oct. 12, 1964 ?  Brian

A date code of Oct 12 1964 would indicate a master cylinder that used the brass adapters . A Oct 12 65 dated master cylinder would have the seats installed in the ports.