27 replies to this topic

[DCVR]

any advantages going to a larger master brake cylinder?

[Wiretap]

Less pedal throw for a given braking force, and firmer pedal feel. You may also want to use a BE/BH Rev D vacuum booster as they give the best pedal feel.

[Familyman]

Handy unknown info there. Much appreciated.

[DCVR]

Less pedal throw for a given braking force, and firmer pedal feel. You may also want to use a BE/BH Rev D vacuum booster as they give the best pedal feel.

Vacuum booster = brake booster?

[Wiretap]

Less pedal throw for a given braking force, and firmer pedal feel. You may also want to use a BE/BH Rev D vacuum booster as they give the best pedal feel.

Vacuum booster = brake booster?

Affirmative.

[kamineko]

also consider finding a larger diameter master cylinder. just make sure the port setup is compatible.

diameter is cast on the cylinder itself.

i tried to upgrade my V2STIRA non-abs booster / master to V7STIwagon ABS and the ports didn't match up.

ended up using booster/master & proportioning valve from a V4 typeR non-abs car

i don't remember the master cylinder bore sizes, but the V4 was larger. matched to GC8 4pots, pedal feel on track is great until i cook the fluid/pads

maybe you could use the master/booster combo from the BE/BH setup mentioned

[DCVR]

also consider finding a larger diameter master cylinder. just make sure the port setup is compatible.

diameter is cast on the cylinder itself.

i tried to upgrade my V2STIRA non-abs booster / master to V7STIwagon ABS and the ports didn't match up.

ended up using booster/master & proportioning valve from a V4 typeR non-abs car

i don't remember the master cylinder bore sizes, but the V4 was larger. matched to GC8 4pots, pedal feel on track is great until i cook the fluid/pads

maybe you could use the master/booster combo from the BE/BH setup mentioned

thanx Kam...........tell me more about the port setup? compatability

[boostin]

Just which way the pipes point.

[kamineko]

Just which way the pipes point.

maybe, but that wasn't so much my problem. there may be a different number of ports between ABS and non-abs. 2 vs 3? i'm not too sure, it was a few years ago. my point is to take note of what you already have, and check the upgrade can be made to work

[nztintin]

yeah i run a bigger master cylinder after i went to brembos, made the pedal feel nicer
i had issues with the ports going from 4 ports on the ra cylinder to 2 ports on the v7 cylinder, ended up running a couple of 't' peices of each line, one for fronts, one for rears and a adjustable proportioning valve for the rears.

[DCVR]

yeah i run a bigger master cylinder after i went to brembos, made the pedal feel nicer
i had issues with the ports going from 4 ports on the ra cylinder to 2 ports on the v7 cylinder, ended up running a couple of 't' peices of each line, one for fronts, one for rears and a adjustable proportioning valve for the rears.

Did u do mc and booster same time?...or just mc?

[nztintin]

Im 99% sure i just did the master cylinder, was on a 95 ra so i dont know if it already has a good booster? I didnt fit it myself so my memory isnt that flash.

[DCVR]

Less pedal throw for a given braking force, and firmer pedal feel. You may also want to use a BE/BH Rev D vacuum booster as they give the best pedal feel.

are they a problem free direct swap for the RS one?.................have you done, or do you know of someone who's actually done this mod?

Thanx

[Wiretap]

Straight swap into a GC, but no, not BC. So long as you have ABS (2-port master cylinder) it should just be a matter of extending the front-most line to reach the top rather than the side with the appropriate L-piece and some solid tubing.

The booster itself WILL just bolt in however.

[Reuben]

What would be a good upgrade for my little BC3? Non abs, tiny N/A thing. I'm putting some 294-2-pots up front when I can be bothered, to match the rear 266-1-pots I installed a year or so ago... I fear the N/A 260mm/drum booster will not be up to the task.

[DCVR]

Just to update people................This upgrade was completed and tested on the track.

The difference is nite and day. All I did was swap the V6 sti RA Non ABS 1 & 1/16 MC in. The lines all hooked up no probs.

On the track the feel was incredible..............less effort but more bite and came on harder with less travel. Didn't fade all day

Highly recommended

See my garage thread for pics and shit

[Leufkax]

been following this thread with interest

[Reuben]

Indeed, I need to upgrade the BC3's to something compitent, but am limited to non abs master cyls... Only ones I have easy access to down here are BC/BF GT ones. I can get myself a BH booster though, worth getting one? (it's rev-

[DCVR]

Indeed, I need to upgrade the BC3's to something compitent, but am limited to non abs master cyls... Only ones I have easy access to down here are BC/BF GT ones. I can get myself a BH booster though, worth getting one? (it's rev-

i didn't end up swapping the booster just the MC so duno if it will make any diff.........try it

[boostin]

I fitted my new big master cyl today. My god, what a difference! Highly recommended!