Brake advice - master cylinder
08-18-2017, 10:28 AM
Post: #11
Brake advice - master cylinder
i have aps up front and kouki booster kit.
works fine i think.
if interested i have modception one with 2 bolt patern brand new.
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08-21-2017, 12:43 PM
Post: #12
Brake advice - master cylinder
(08-18-2017 07:55 AM)Project D Wrote:  Kouki BMC are 7/8" yes, and it should be fine with RX7 calipers.
Also, for BMC with the same bolt pattern as the kouki AE86 you have the MA70 (1" I believe) and the SW20 (7/8" NA and 15/16" on the turbo).

The stock RX7 FC BMC is 7/8" and 15/16" on the FD.

PS: the bigger the bore on the BMC, the harder you have to press on the pedal for the same braking force.
So as long as your pedal don't travel too far, don't go too big.

(08-18-2017 10:28 AM)ditn Wrote:  i have aps up front and kouki booster kit.
works fine i think.
if interested i have modception one with 2 bolt patern brand new.

That's great guys! Thank you for your help Smile it's really appreciated!
I am running FD calipers in front as I managed to bag the pair (with a Mazda rebuild kit) for £100!

I'm planning on replacing the BMC anyway as it has a leak so I may go for the SW20 Turbo one, just to make sure. I know I'll likely need a Brake Bias valve to try and balance it out anyway so might as well overhaul the full system.

*I LOVE the wealth of knowledge in the AE86 community Smile*
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08-21-2017, 03:21 PM
Post: #13
Brake advice - master cylinder
Just in case, FC and FD calipers are the same mechanically speaking (the differences are only aesthetics) and the specs are very close to the original AE86 or SW20 calipers.
We are talking less than 10mm² of total piston(s) surface. (2027mm² for the AE86 vs 2036mm² for the RX7 and SW20 calipers)

One of my friend have FC calipers with the stock 13/16" BMC on is AE86 (zenki) and it work OK, but the pedal travel is a bit long.

PS: apparently not ALL SW20 turbo came with 15/16" BMC, some used 7/8".
If you want to go that way, here is a exemple of the 15/16 version:
http://www.ebay.co.uk/itm/282608737104
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