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Brakes - Master Cylinder Upgrade?


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#1 DiscoShit

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Posted 04 April 2012 - 07:09 PM

so ill be installing my evo9 brakes withing the next week or so, but im afraid the brake pedal is going to be spongy.

i know most people on here dont ever go bigger than Z32 brakes, but for those who do. what brake master cylinder upgrade do you use? im guessing the cressida bmc is a 7/8 diameter so i would like something that's at least a 1".

#2 Bill

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Posted 04 April 2012 - 08:08 PM

try it first at least. you running r-compounds?

VVT 1JZ X83 ♠ VVT 2JZ S160 ♠ VVT 3UZ S160


#3 DiscoShit

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Posted 04 April 2012 - 08:22 PM

not R compounds, at least not yet. i did find a good deal on some toyo t1r that should be enough. ive driven a few of my friends sti/evos and these brakes feel pretty good. i bought some ausfalian dba rotors and plan on getting a set of hawk pads for them. for now these shitty pads should suffice.

#4 DiscoShit

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Posted 04 April 2012 - 08:30 PM

found this

From left to right
1. MR2 91 ABS [7/8"] (aisin)
2. 4runner 94 non-abs [1"] (Jobber) from toms
3. 4runner 94 non-abs [1"] (aisin)
4. 4runner 94 ABS [1" 1/16] (aisin)
Posted Image

im thinking the 4runner ones should fit since it has the 4 bolt early 90s toyota bolt pattern. but im definitely going to try the stock one first.

#5 Bill

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Posted 04 April 2012 - 08:33 PM

good find.

from experience pushing 12 pistons with the stock master, it still felt great to me, I'm sure it wouldn't change too much.

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#6 DiscoShit

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Posted 04 April 2012 - 08:34 PM

4runner piece

Posted Image

cressida piece

Posted Image

#7 DiscoShit

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Posted 04 April 2012 - 08:36 PM

you're probably right. i looked on supra forums and people that switch from TT brakes to bigger 6 piston calipers never change the stock master. then again their stock mc is a 1". time will tell.

#8 Guest_DuaxMachine_*

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Posted 04 April 2012 - 08:37 PM

Hm, 1-1/16" that I didn't know about !
Already have a 4-Runner 1" unit sitting here, new in the box, but I'll have to run down one of the larger ones.

#9 DiscoShit

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Posted 04 April 2012 - 08:51 PM

you ever try it on the cressida gordo?

back at the shop where i work at we installed these same evo9 brakes on a s14. the brakes felt weak with the stock 7/8 mc. a week after we installed a z32 1" master on the same car and it made a huge difference. i would post a picture but everyone knows how a s14 and evo brakes look like.

#10 Guest_DuaxMachine_*

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Posted 04 April 2012 - 09:00 PM

Not yet, but soon.
I have the GT-R calipers on now, but my stock master is bypassing internally, so it's got to go.
I do have aftermarket brake lines, and that took a lot of the softness out, but I don't like being so close to having the pedal bottomed out under hard braking.

I am also having to go to the AW11 booster to gain a little clearance for the ITBs.

#11 MikeRN

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Posted 05 April 2012 - 05:49 AM

aren't x8 ABS BMC's 1" ??

1998 t100 same as 94 4runner :
http://www.ebay.com/...527d18d&vxp=mtr

#12 Guest_DuaxMachine_*

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Posted 05 April 2012 - 08:21 AM

I think so, but this X8 is a non-abs, so I have the 7/8" master.

#13 MikeRN

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Posted 05 April 2012 - 08:34 AM

im thinking about upgrading to the 1 1/16" , i currently have the 1"
is the extra 1/16" worth $70? i doubt the pedal feel will be firmer from that extra bit...

#14 Guest_DuaxMachine_*

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Posted 05 April 2012 - 10:26 AM

Firmness is not a function volume.
Firmness comes from better lines, a good bleed job, and caliper rigidity.

Volume makes for less pedal travel, and increased required foot pressure.

#15 DiscoShit

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Posted 05 April 2012 - 08:04 PM

i hope the abs mc is a 1" any one can confirm?

#16 Guest_DuaxMachine_*

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Posted 05 April 2012 - 08:17 PM

What numbers are on it ?
I used to have the codes hid somewhere on my hard drive, if I can find their secret hiding spot.

#17 MikeRN

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Posted 06 April 2012 - 06:06 AM

it is 1"
just checked on rockauto
http://www.rockauto....ramecatalog.php

#18 DiscoShit

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Posted 06 April 2012 - 09:07 PM

http://www.rockauto....o.php?pk=309174 the raybestos mc390028 says is 1 1/16.... MC39854 says is 1" either way is good news!

#19 bwcress

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Posted 06 April 2012 - 10:51 PM

i dont think a master upgrade will be needed with the evo brakes the actual piston sizes arent much bigger then the 300zx/gtr brake upgrade... so you should be fine... the question is are you going to delete all the abs shit?

#20 DiscoShit

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Posted 07 April 2012 - 08:17 AM

yesssirrr im deff deleting all that crap.




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