Big brake kit

[SuperTom]

[LRNAD90]

For those looking for BBK options, it appears that the 2006-2007 WRX STI Brembos and brackets are a direct bolt-up, no grinding of the spindle needed, but a wheel spacer appears ot be needed with stock wheels.

*EDIT* - Adding infom from comment section:

'SockMonkey1128

Couple quick other notes for people looking to do this:
Because of the way they mount on the STI vs BRZ the bleeders will point down, making bleeding almost impossible. You need to move the bleeder to the other side of the caliper. The calipers CANNOT be swapped to opposite side. They need to stay on their original side because of differentially sized pistons.
As long as you pair them with 08-17 rears, brake bias is maintained to ~4.4% of oem. All those articles that state otherwise are intentionally misleading to promote their own brake up grade kits.
04-07 front Brembos are identical to 08-17, for all intents and purposes. It's the rears that matter. 08-17 rears have larger pistons and are direct bolt on, no adapter brackets.
And 04-17 fronts don't require any grinding to install. That is only necessary if you want to install the metal harmonics bar/bracket that they put on the earlier BRZ's to help mitigate brake noise.'

Seems likely these comments are from the same SockMonkey on FT86 tracking dyno numbers?

[timurrrr]

Originally Posted by LRNAD90

As long as you pair them with 08-17 rears, brake bias is maintained to ~4.4% of oem.

As someone else correctly mentioned on that comment thread, it shifts the bias forward, and if anything on these cars the bias should be shifted slightly rearward vs OEM for optimal braking.

[NoHaveMSG]

Originally Posted by timurrrr

As someone else correctly mentioned on that comment thread, it shifts the bias forward, and if anything on these cars the bias should be shifted slightly rearward vs OEM for optimal braking.

To a point yes. I know rice_classic runs a more forward bias pad stagger with his T4 race car on slicks. With a wing on my car and 200TW tires I am looking for a more rearward bias in pad stagger along with my BBk being a touch more rear biased then stock.

[Tokay444]

Originally Posted by timurrrr

As someone else correctly mentioned on that comment thread, it shifts the bias forward, and if anything on these cars the bias should be shifted slightly rearward vs OEM for optimal braking.

If you're adding grip, you need to add front bias to go along with it.

[ZDan]

Originally Posted by Tokay444

If you're adding grip, you need to add front bias to go along with it.

This would be car-specific, but I've never found this to be true on the cars I've tracked (240Z, S13 and S14 240SX, AP1, V8 FD). FWIW I've been running the BRZ without ABS for the past season and a half on Hoosier A7s and Yok A052s, and the fronts always lock first. I ran the S2000 without ABS as well, same deal. Square pads always.

I've never been tempted to run "staggered" pads on any of my cars that would give more front bias.

[soundman98]

Originally Posted by ZDan

This would be car-specific, but I've never found this to be true on the cars I've tracked (240Z, S13 and S14 240SX, AP1, V8 FD). FWIW I've been running the BRZ without ABS for the past season and a half on Hoosier A7s and Yok A052s, and the fronts always lock first. I ran the S2000 without ABS as well, same deal. Square pads always.

I've never been tempted to run "staggered" pads on any of my cars that would give more front bias.

without ABS would also mean without EBD, right? i'm wondering if the Op is attempting to compensate for oem EBD programming by running a forward-biased pad, though i'm not sure how what that really accomplishes. forces the car to rotate more?

[ZDan]

Originally Posted by soundman98

without ABS would also mean without EBD, right?

Yeah, pretty sure pulling the 40A ABS fuse fully shuts down all driver aids.

i'm wondering if the Op is attempting to compensate for oem EBD programming by running a forward-biased pad, though i'm not sure how what that really accomplishes. forces the car to rotate more?

I never got why people ran forward-biased pads on the S2000, don't get it with this car either. I want the rears to do as much work as they can without the risk of rears locking up first, and with the s2k and with the BRZ the fronts have always locked first for me over a wide range of tire grip and conditions, with same pads front/rear. If anything I'd want more rear bias but don't wanna push my luck and risk earlier rear lockup without ABS.

[NoHaveMSG]

Originally Posted by ZDan

Yeah, pretty sure pulling the 40A ABS fuse fully shuts down all driver aids.


I never got why people ran forward-biased pads on the S2000, don't get it with this car either. I want the rears to do as much work as they can without the risk of rears locking up first, and with the s2k and with the BRZ the fronts have always locked first for me over a wide range of tire grip and conditions, with same pads front/rear. If anything I'd want more rear bias but don't wanna push my luck and risk earlier rear lockup without ABS.

I know rice_classic runs ST47 on the front and like the ST43 or 42 on the rear do to too much rear lockup.

[timurrrr]

Originally Posted by NoHaveMSG

I know rice_classic runs ST47 on the front and like the ST43 or 42 on the rear do to too much rear lockup.

Which calipers?

[ZDan]

Originally Posted by NoHaveMSG

I know rice_classic runs ST47 on the front and like the ST43 or 42 on the rear do to too much rear lockup.

Well, I say it all the time cuz it's true, people use brakes very differently. Surprisingly differently! Still I don't get why one driver should get front lockup first and another get rear lockup in the same car... I have the same puzzlement over the S2000, sources said the car would lock rears first without ABS, but after I lost my ABS I *always* had fronts to lock first, over a very wide range of conditions and tires and (always square) brake pads, at the track and on the street. Hmm....

[NoHaveMSG]

Originally Posted by timurrrr

Which calipers?

Stock, as mandated by T4 rules.

Originally Posted by ZDan

Well, I say it all the time cuz it's true, people use brakes very differently. Surprisingly differently! Still I don't get why one driver should get front lockup first and another get rear lockup in the same car... I have the same puzzlement over the S2000, sources said the car would lock rears first without ABS, but after I lost my ABS I *always* had fronts to lock first, over a very wide range of conditions and tires and (always square) brake pads. Hmm....

Yeah, I know. Just relaying what I have talked with him about. I'd imagine the dynamics of the car are a bit different running A7/R7's. Especially being limited to running the Eibach pro-kit.

[timurrrr]

Originally Posted by ZDan

Still I don't get why one driver should get front lockup first and another get rear lockup in the same car... I have the same puzzlement over the S2000, sources said the car would lock rears first without ABS, but after I lost my ABS I *always* had fronts to lock first, over a very wide range of conditions and tires and (always square) brake pads, at the track and on the street. Hmm....

Assuming no aero, other factors are weight distribution, how high the center of masses is, and the grip levels.

Another factor is how fast the initial brake application is.

[WolfpackS2k]

Originally Posted by timurrrr

Will depend a lot more on the pads than calipers.

Larger heat sink capacity is always good. Especially on track. Everything will last longer while maintaining the same performance.