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Old 07-08-2008, 12:56 PM   #1
Bkennedy017
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Default 6spd into 2002 WRX, Need brake master cyl.?

I'm getting ready to do a 6spd swap to my 02 WRX. The trans and everything is from a 04 STI. Do I need to swap the STI brake master cyl. or will the stock WRX be ok with the STI Brembo calipers?

Thanks for the help,
Brandon
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Old 08-03-2008, 11:46 PM   #2
jimbo228
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I have been looking for this answer for a while. I have all 4 brembos on my bugeye and I experence a small "shudder" under light low speed braking. I have had no problems at all at max braking force. I have had three mechanics look at my brakes and no one can figure it out. I was thinking ABS but now i question the master cylinder.
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Old 08-04-2008, 02:23 AM   #3
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I was looking for brembos for my GC and they recommended using the sti master so im can only assume the same.
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Old 08-07-2008, 01:33 AM   #4
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the sti has a bigger piston
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Old 08-07-2008, 08:49 AM   #5
ownnij
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Quote:
Originally Posted by Bkennedy017 View Post
I'm getting ready to do a 6spd swap to my 02 WRX. The trans and everything is from a 04 STI. Do I need to swap the STI brake master cyl. or will the stock WRX be ok with the STI Brembo calipers?

Thanks for the help,
Brandon
02-04 WRX MT has the 26.99mm MC
05-07 WRX MT has the 25.4mm MC
04-07 STi has the 26.99mm MC
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Old 08-08-2008, 06:00 AM   #6
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I have an 02 wrx with complete sti drivetrain swap off of an 05 sti. I didnt change the master brake cylinder everything works fine.
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Old 08-08-2008, 04:36 PM   #7
ciper
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A 6 speed swap does not require any changes to the brakes whatsoever.
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Old 08-11-2008, 12:24 AM   #8
sense of nature
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^^ yep why would it ??
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Old 08-11-2008, 01:15 AM   #9
mikeis300
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Quote:
Originally Posted by ciper View Post
A 6 speed swap does not require any changes to the brakes whatsoever.
if you just swapped the tranny and not the rear diff and hubs/knucle, then your right you dont need to change the brakes. but since he did change the rear diff and hubs his old axles will not fit into the sti diff, and sti axles dont fit into the 02 rear hubs. if they did swap that easy then all of the wrx owners would swapp to the sti axles, but life isnt that easy.

so please dont post a comment if you dont know what your talking about.
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Old 08-14-2008, 01:18 AM   #10
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Quote:
Originally Posted by mikeis300 View Post
if you just swapped the tranny and not the rear diff and hubs/knucle, then your right you dont need to change the brakes. but since he did change the rear diff and hubs his old axles will not fit into the sti diff, and sti axles dont fit into the 02 rear hubs. if they did swap that easy then all of the wrx owners would swapp to the sti axles, but life isnt that easy.

so please dont post a comment if you dont know what your talking about.
If you will please notice, he said no changes to the brakes, nothing about axles in his post you quoted, as I'm sure we are all in agreeance that when you do a 6MT swap, the brakes/hubs/rear diff go with it, as was stated above.
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Old 08-15-2008, 02:31 AM   #11
mikeis300
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Quote:
Originally Posted by 02Rexboy View Post
If you will please notice, he said no changes to the brakes, nothing about axles in his post you quoted, as I'm sure we are all in agreeance that when you do a 6MT swap, the brakes/hubs/rear diff go with it, as was stated above.
next time read the whole thread, not just one post. after you have completed such a simple task, you can speak.

Quote:
Originally Posted by Bkennedy017 View Post
I'm getting ready to do a 6spd swap to my 02 WRX. The trans and everything is from a 04 STI. Do I need to swap the STI brake master cyl. or will the stock WRX be ok with the STI Brembo calipers?
Thanks for the help,
Brandon
so let take a look at some key points

1.
Quote:
Originally Posted by Bkennedy017 View Post
The trans and everything is from a 04 STI.
im thinking everything means the brakes as well, but let make sure

2.
Quote:
Originally Posted by Bkennedy017 View Post
Do I need to swap the STI brake master cyl. or will the stock WRX be ok with the STI Brembo calipers
yep there it is, brembos'. 02Rexboy does the 02 wrx come with brembos, nope didn't think so. im going to make an educated guess and say that he's asking about the brembos he going to put on his car with the swapp.
now its your turn to do something educated.
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Old 08-15-2008, 09:27 PM   #12
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the stock wrx will be ok with the brembo calipers. I had them on my car long before I threw in the 6 speed. if you are swapping the rear end as well you will need the axels and rear brakes too. search a little and you will find a master swap guide.
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Old 08-25-2008, 08:05 PM   #13
ciper
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Quote:
Originally Posted by mikeis300 View Post
if you just swapped the tranny and not the rear diff and hubs/knucle, then your right you dont need to change the brakes. but since he did change the rear diff and hubs his old axles will not fit into the sti diff, and sti axles dont fit into the 02 rear hubs. if they did swap that easy then all of the wrx owners would swapp to the sti axles, but life isnt that easy.

so please dont post a comment if you dont know what your talking about.
You can't assume any extra parts were swapped if he didn't include them. A six speed transmission swap DOES NOT require changing any of the following -
front axles*
rear differential
rear axles
hubs
brakes
flywheel/pressure plate/disc
clutch master cylinder
brake master cylinder
*depending on the recipient car he may need axle seals or stubs

His original comment was "The trans and everything is from a 04 STI." This in my mind means transmission + clutch + transmission crossmember + shift linkage. STI brembos could mean 5x100 rotors.

NOW if he said "I am converting my car to use 5x114 hubs with the STI brembos and do I need to change master cylinders" I'd still say no because the brake balance is still fairly close to stock. There is an excel spreadsheet that someone created to calculate this and its not that far off.

so please dont post a comment if you dont know what your talking about.

Last edited by ciper; 08-25-2008 at 08:45 PM.
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Old 08-31-2008, 06:19 PM   #14
mikeis300
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you know at this point why sugar coat it, you're an idiot. you're giving miss guided advise when you don't know what your talking about. either it's intentional, or you think you know more than you actually do.



just look at what you write.

Quote:
Originally Posted by ciper View Post
A six speed transmission swap DOES NOT require changing any of the following -
front axles*

rear differential
rear axles
hubs
brakes
flywheel/pressure plate/disc

so this guy said his car is a my02, so since he didn't mention swapping his 5 speed setup to a different year, he should still have the factory rear diff. with the 02 rear diff he COULD use a 06 sti trans, but he WILL HAVE TO change the front axels. if he wants to use a early 04(not a late model 04) then he can reuse his axles, BUT CAN'T use his factory rear diff! he will now need to change to a sti rear diff.

if the diff is changed now he can't use the factory axles, he'll need axles from a sti. with sti axles in the rear he cant use the spindle in the stock hubs, so he needs to change the hubs to those from a sti. and of course new hubs means new brakes as the 02 wrx brakes don't fit the sti rotors/hubs.

now lets look at the clutch/fly wheel. if he reuses the wrx clutch and fly wheel he is going to have a much shorter life span on that disk from the heavier gears, and the shorter ratio. also putting a sti tranny into the wrx clutch is a task in it self, you have to make sure that they are perfetly linned up(more so that with a sti clutch) because the threds can become inter locked(cross threding). the lower stature or the wrx clutch/fly wheel makes for less metal to guide in the trany. just do the job right the first time, get the sti clutch.

Quote:
Originally Posted by ciper View Post
You can't assume any extra parts were swapped if he didn't include them.
ok then what is this.
Quote:
Originally Posted by ciper View Post
His original comment was "The trans and everything is from a 04 STI." This in my mind means transmission + clutch + transmission crossmember + shift linkage. STI brembos could mean 5x100 rotors.
i think that means your assuming.
Quote:
Originally Posted by ciper View Post
so please dont post a comment if you dont know what your talking about.

take your own advise.

Last edited by mikeis300; 09-01-2008 at 03:34 PM.
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