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Mike - no I have a 19mm (911) master cylinder; stock is 17mm. The 21-23mm m/c would be oversized for these brakes and IMHO are really only needed when you go to something huge like 930/951/993 calipers where you need to push a lot more fluid and move a lot more piston area.
Also the 914/4 front calipers are installed on the rear.
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Chris C.
1973 914 "R" (914-6) | track toy
2009 911 Turbo 6-speed (997.1TT) | street weapon
2021 Tesla Model 3 Performance | daily driver
2001 F150 Supercrew 4x4 | hauler
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