Master cylinder question for AE86

[Simon-KE70]

quite a few of the jap ae86 drifters have bent their ae86 stub axles... it doesnt take much really, just general thrashing will do it after a while.

bending struts to get camber is nothing new, the rotary guys were doing it when the RX2's and the like came out lol

[Hokey]

simon what did you do about the stock proportioning thingo? i just want something that'll bolt up without needing to modify my lines. running corona rt132 twin piston calipers at the front and hilux drums at the back (fkn huge!) pedal is very spongey atm and want something bigger.

cheers

[Thestitt]

what sort of size are these boosters compared to a KE70

any ideas??

[Simon-KE70]

larger in diameter but thinner over all.

[s14seriesII]

nissan master cylinders have casting marks like bm38 (7/8 bore) bm44 (15/16) bore and bm50 i think is 15/16 or 1"

the r32 r33 and s14 non abs all came with bm44 unless they were n/a in which bm38

someone please feel free to correct me if they have seen something differ from this

and who ever said s14 never came out without abs is a twit

[4000GT]

Hey how did this go mate? The proportioning valve built into the BM44 master cylinder correct? So its an install and forget mod? I just popped one in my project car and will do all new lines.

[s14seriesII]

the proportioning valve is built in yes..
its very easy to change while in car.. only requiring a quick brake bleed after instalation,

amongst the same master cylinders (bm44) for instance there are different valves to suit different cars, and they are all interchangeable, even from a bm38 or bm50,

its all up to trial and error the valve itself has a code stamped into the end of it. i modified it so i have a 50/50 pressure split and manually adjust it with my willwood in cabin valve

[4000GT]

Ah yup, sounds like the way to go, setting the bias is not going to be that easy without a brake dyno. How do you do it? Chalk on the tyres and a mate watching?

[s14seriesII]

adjust by feel.. seat of the pants i believe the saying is.. basicly i would suggest you to adjust until it has all bias at front,
then slowly adjust untill the rears will squerm and sqeal/lock first, then adjust back untill the front is just over braking the rear..
this is normal, you can adjust to suit your style, these adjustments should be done under extream hard braking (on the race track) and a panic stop situation should be caried out to ensure it will be safe on the street

[Sam-Q]

I guess I need to look into this BM50 master, I really want to get myself a bigger bore master. WHile we are on the topic does anyone recognise this?




It irritates me that this is the only part on my car where I don't know where it's from. It has a 15/16" bore.

So has anyone had any success in modding a master to have a bigger bore? because I am thinking about it.