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help!!!!

Posted: Wed Apr 01, 2009 11:17 pm
by nt66
I am trying to find out what the piston sizes are on the stock brake master cylinder and clutch master cylinder thanks ( ineed these numbers really bad)

Posted: Thu Apr 02, 2009 7:38 am
by dr.occa
the bore is 13/16". is that what you're looking for?

Posted: Thu Apr 02, 2009 8:05 am
by dr.occa
if you're looking to go bigger, try a master cylinder out of a Nissan 200sx 1.8 or 2.0. it has a 15/16" bore size as opposed to the 86's 13/16" bore.

AE86 MC:
Image

200sx MC:
Image

just check on how the mounting holes line up right.

Posted: Thu Apr 02, 2009 5:36 pm
by nt66
now what i need is the size of the clutch master

Posted: Thu Apr 02, 2009 10:47 pm
by dr.occa
nt66 wrote:now what i need is the size of the clutch master
5/8"

i actually responded with both information on your C4AG post earlier.

Posted: Thu Apr 02, 2009 11:12 pm
by nt66
oh and i was reading that a bigger master equals less pedal travle but less clamping force at the calipers so if anything i will go a little smaller

Posted: Fri Apr 03, 2009 7:56 am
by dr.occa
nt66 wrote:oh and i was reading that a bigger master equals less pedal travle but less clamping force at the calipers so if anything i will go a little smaller
also, you might consider going with a longer cylinder as well. the idea w/ the longer cylinder on a narrower bore is it makes up for the benefits of a larger bore in reducing pedal travel. that way you get both good clamping and less effort :)