# Which Brake Master Cyclinder should i upgrade to?

**URL:** <https://forums.speedlife.net/t/which-brake-master-cyclinder-should-i-upgrade-to/87248>\
**Category:** SON240sx Automotive\
**Created:** [July 18, 2005, 11:54am UTC](https://forums.speedlife.net/t/which-brake-master-cyclinder-should-i-upgrade-to/87248 "2005-07-18T11:54:01Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Pccw](https://avatars.discourse-cdn.com/v4/letter/p/bc8723/32.png) [@Pccw](https://forums.speedlife.net/u/Pccw)\
**Post date:** [July 18, 2005, 11:54am UTC](https://forums.speedlife.net/t/which-brake-master-cyclinder-should-i-upgrade-to/87248/1 "2005-07-18T11:54:01Z")

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hi, i have an s14 with sr, and i bought the rotora 6 pot front caliper, and my autoshop told me i should upgrade the BMC inorder to fully function the 6 pot caliper, i try search for 300zx ones, but i want something more, something better than that, anyone can help?

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**Author:** ![S13GG](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/s13gg/32/5506_2.png) [@S13GG](https://forums.speedlife.net/u/S13GG)\
**Post date:** [July 18, 2005, 1:13pm UTC](https://forums.speedlife.net/t/which-brake-master-cyclinder-should-i-upgrade-to/87248/2 "2005-07-18T13:13:47Z")

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I use a 90 zx TT 1 1/16" (nabco not tokico), compared to stock 15/16" (ABS).

good luck, post results

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**Author:** ![SHIFT\_KA24DET](https://avatars.discourse-cdn.com/v4/letter/s/b9bd4f/32.png) [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)\
**Post date:** [July 19, 2005, 12:50am UTC](https://forums.speedlife.net/t/which-brake-master-cyclinder-should-i-upgrade-to/87248/3 "2005-07-19T00:50:22Z")

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you’re going to need a bias dude if you use the 11/16’s on a 6pot upfront with stocks out back.

You’ll lock up the rears all the time.

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**Author:** ![Pccw](https://avatars.discourse-cdn.com/v4/letter/p/bc8723/32.png) [@Pccw](https://forums.speedlife.net/u/Pccw)\
**Post date:** [July 20, 2005, 1:17pm UTC](https://forums.speedlife.net/t/which-brake-master-cyclinder-should-i-upgrade-to/87248/4 "2005-07-20T13:17:42Z")

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i want to change the rear to the 350z brembo, but i heard is not possible  
and which company makes the bias?  
and how do i know which BMC will fit me