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> The GT-Four Brake Upgrade, ST205 Brake Upgrade for 5x100 & 5x114 PCB
post Jul 24, 2013 - 11:17 AM
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Tigawoods



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This is a GUIDE not a HOW TO and is a thread in progress. Its going to take me a bit to properly organize this load info into a visually pleasing manor.

If anyone has any input from their own experience post or PM me and I will add the info in! There is alot of info in here and I am sure it will get very convoluted



**Be aware that the ST205 Brake upgrade will require at least a 16" wheels and possibly spacers to adjust the offset and avoid contact between the face of the caliper and the backside of the rim face. **



Torque Specs
Caliper halve bolts (four bolts that hold the caliper halves together)
14-17 ft/lbs *Have an even torque value on each bolt (add a dab of red loctite to the bolts thread ends)

Caliper Seal Part Numbers:

Stephen at GT-FourPlay UK sells a rebuild kit. You can still get the kit lsited below from rock auto but Stephens kit is alot more straight forward and youd be supporting Local (UK) business!
https://www.gt4-play.co.uk/shop/brake-calip...ce-kit?___SID=U

Caliper Re-seal Kits (Centric Brand From Rock Auto)
Front Seals X4 #14344031 (kits are used for the small crossover seals for all 4 calipers/the piston seals in this kit are too large so the rest is unused)
Rear Seals X2 #14342021 (Each Single kit services 2 calipers. These piston seals are used for the front too)
(I need to re-confirm that the rear piston seals fit the front pistons)
This will cover the crossover seals/piston seals/piston boots/piston retaining rings

Caliper Hardware Part Numbers
(Need to add the Pad Pin retaining wire #'s & toyota diagram)

Front pin clips: #04947-14010
Front pad pins: #90240-06019
Front shims: #04945-14110 (EBC pads come with stick on shims)

Rear pin clips: #04948-14010
Rear pad pins: #90240-06017
Rear shims: #04946-14030 (EBC pads come with stick on shims)




Front Hub/Caliper Preparation:
(These part#'s correspond to the McMaster-Carr Catalog. I highly recommend ordering hardware from them: www.mcmaster.com as they have VERY fast shipping and exceptional products)

Caliper Prep:
For the rotor to sit center in the caliper, the mounting tabs on the caliper will need to be shaved a slight bit.
Use a DREMEL and shave 7-8mm off of the mounting tabs. START OFF SMALL and shave say 5mm and check clearances, it is quite possible that with whatever spec rotor you use or just slight differences in hub thicknesses may not require a 7-8mm shave

(keep in mind that if you plan on powdercoating the calipers, that will add 1mm or so on top of the mounting tabs, unless you leave them uncoated.)

Use a Micrometer to make sure that the mounting tab is an even #mm across the entire area you shaved.





Hub Prep:
_____________________________________________

The stock hubs are thread-less and will need to be threaded. Below are the specs I prepped my hubs to but also a small description of what Culpable did with his hub. The way I did it requires a bit more drilling, and it is possible to just re-tap the thread-less hub holes rather than drill them out and re-tap. If you drill the hubs you will possibly need to drill out the caliper holes to match. The tap information is listed below.


CULPABLES THREAD (link at bottom of this post):
take the knuckle off the car and thread tap them thread taps are available anywhere, buy matching bolts for the thread you are tapping ( grade 8 bolts please ) use a 1/2 x 20 tap or finer thread. ( the one used on the pictures is 9/16 x 20 but no need to go that big as that will require to drill the hole to make it a little bigger)

______________________________________________

Carbon Steel Hand Tap, 9/16"-18, 4 Flute (I will add the kind of tap wrench that is best for tapping the hubs)
#26035A216


Drill for Tap
33/64
http://www.mcmaster.com/#catalog/119/2432/=oglxb8
8947A217 - 118 Degree Point High-Speed-Steel Short-Length Drill Bit, Black Oxide, 33/64", 3-7/8" Length Overall - $18.92
(CALIPER HOLES WILL ALSO NEED TO BE RE-DRILLED IF USING THIS SIZE, MAKE SURE TO DRILL TO MATCH THE DIAMETER OF THE BOLT YOU ARE USING TO MOUNT THE CALIPERS, THIS DRILL BIT WILL BE TOO SMALL)

Grade 8 Alloy Steel Hex Head Cap Screw, Zinc Yellow Pltd,9/16"-18 Thrd, 1-1/4"l,fully Thrd
#92620A779


(Large washers are used in between the Front Caliper bolts and Hub and one washer has to be trimmed per axle, I will add their sizes later)

The Brake dust shield will fit and no modification is needed other than pushing it back a bit to avoid contact with the rotor (WITH 300mm Rotor).


Rear Hub Preparation:

I was fortunate enough to get the oem caliper bolts with the calipers in the kit from Culpable. I will get their specs since those are the bolts you will need to mount the caliper, the oem ST204 bolts are too short.

The rear dust shield will need a good amount of trimming (use a small dremel) for the caliper to fit. Its hard to really explain where it will need to be cut exactly, but just hold up the ST205 caliper to its mounting mount and you will be able to judge where it will make contact with the dust shield. Both around the top and bottom mount holes on the hubs will need to be trimmed. (If you plan on powdercoating your calipers make sure to do this before, I scratched my newly powder coated calipers holding them up trying to judge how much more I needed to trim)

When mounting the Rear Calipers, there needs to be a 6mm spacer washer between the caliper holes and mounting bracket.
This will correct and center the caliper to match the lower rotor height of the ST205 disk (The ST205 disk is 6mm smaller than the GT disk). As a temporary solution I used 2 washers (2.5mm thick) per hole that when stacked added up to about 6mm. Washers usually have a thickness tolerance of +/- .3mm so I had to sort through a whole bunch to finally find a combination that added up to the right spec. Anywhere between 5-6mm will work fine but the closer to 6mm the better

The better solution, as discussed with ricochet1490, would be to get a custom made 6mm thick washer.

McMaster sells extra thick high strength steel washers, I am ordering a few to test them out, supposedly the thicknesses of the washers arent consistent but we will see



Rotors:

OEM Celica Dimension Specs


Front:

Be aware of the hub diameters. The OE Celia hub diameter is 54.1. Most of our options for the front will be larger than that.
I personally like to have hubcentric rotors but you can run them lug centric if you dont feel like making a shim, I would advise against that though.


Subaru BRZ/Impreza Rotor
Part Number: Centric 121.47021
PCB - 5x100
Hub Dia - 58
Dia - 292mm
Centric Brand Part Number: 121.47021


(additional info on aftermarket solutions will be added soon thanks playr158 for the find!)

93-99 Toyota Supra NON-Turbo
PCB - 5x114.3 (Must Be Re-Drilled)
Hub Dia-60.1
Dia-296mm / 11.811"


****Most OEM and OEM replacement Supra Non-Turbo rotors have service holes on the face of the hat preventing them from being re-drilled to 5x100, Most aftermarket 2-Piece Rotors do not have these service holes allowing the hats to be re-drilled. Always check before purchasing. THIS MAY NO LONGER BE A VIABLE OPTION****




5x114.3 Conversion Front Rotors
93-99 Toyota Supra NON-Turbo
Supra Hub Dia-60.1
Dia-296mm / 11.811"

Rear:

ST205 Rear Rotors
Hub Dia-54.1
Dia-315mm

I highly recommend EBC Brand through this site
http://www.ebcbrakesdirect.com/ (Fast Int'l Shipping with Tracking code!)
Here you have the option of OEM/SlottedDimpled/Slotted

ENDLESS also makes a Slotted and Blank Rear Disk
Blank Rotor (Single) $176
Slotted Rotor (Single) $225
ENDLESS Rotor PDF

5x114.3 Conversion Rear Rotor
***TBD****

Brake Pads:

Supra MK4 Turbo Pads
I recommend EBC brand pads as they come with black 3M rubberized stick on shims. Do Not use both the stick on rubber shim and the metal Toyota/Other brand shim.
Part#
Front
DP31004C
Rear
DP31005C

Some other brands that have both streetable performance and race performance pads that will fit are

-HAWK Pads
-Carbotech Pads
-Endless Pads


I have only ever used EBC pads so I have never needed Shims from Toyota. I am not sure if other brand pads come with some sort of shim. If they don't you will need to order a set of shims

3M Stick on Shims




Brake Lines:

ST205 Lines

ST204 (GT) Lines

Custom Lines (recommended)


Bleeder Fittings

Speed Bleeder #SB1010
Buy them. They work wonders


Caliper High Temp CELICA Stickers
http://www.ebay.com/usr/uber9
Since the sale is re-listed weekly I cannot provide a direct link. Sreach for "celica" and the results will show up. Be sure to message the seller to specify it is for the ST205 Calipers


Brake Bias Controller
One thing that will be immediately apparent with this swap is a different brake bias than what the GT/ST provided.
The bias wont be the same for every car this swap is done for. There are alot of factors that will effect the ration ever so slightly. Worst case scenario your rear bias will be too much to the point of locking up way before the fronts get a chance too. For DD emergency situations, this may be undesirable.
Combat this will installing a Brake BIAS Controller.
I recommend Tilton as the brand to buy but there are other more budget friendly brands.



Brake Proportioning Info
http://stoptech.com/technical-support/tech...rtioning-valves

Additional Links/Reference Links:
ST205 Brake Upgrade Completed (Culpable04)
ST205 Brakes on a ST (Culpable04)
ST205 Brake Upgrade Completed (Batman722)
Toyota Supra Specifications


End Goal?


This post has been edited by Tigawoods: Dec 6, 2018 - 9:58 AM


--------------------

1995 GT::::Diffusing the Situation
エキサイティングカーレーシングチーム!
march 2010 COTM : 6GC feature 2014 : january 2015-2016-2018 COTM

Posts in this topic
- Tigawoods   The GT-Four Brake Upgrade   Jul 24, 2013 - 11:17 AM
- - yellowchinaman   That is really useful. Im doodling on the idea of ...   Jul 24, 2013 - 1:36 PM
- - playr158   Thanks TIGA. I was going to do the same with the i...   Jul 24, 2013 - 2:12 PM
- - njccmd2002   but then you have to redrill the gt4 rears... u ...   Jul 24, 2013 - 3:37 PM
- - playr158   I believe there might be some bolt on rotors but n...   Jul 24, 2013 - 7:48 PM
- - Fate   *subscribed.   Jul 24, 2013 - 9:28 PM
- - Tigawoods   QUOTE (playr158 @ Jul 24, 2013 - 3:1...   Jul 25, 2013 - 8:09 AM
- - playr158   Well if we use FRONT: GEN 1 RAV4 front hubs + M...   Jul 25, 2013 - 10:29 AM
- - njccmd2002   well how big are the rear supra rotors?   Jul 25, 2013 - 10:36 AM
- - Tigawoods   300mm I believe   Jul 25, 2013 - 10:46 AM
- - njccmd2002   duh, how thick are the rear supra rotors. thats ...   Jul 25, 2013 - 12:10 PM
- - Tigawoods   15mm methinks. Either that or 17mm   Jul 25, 2013 - 12:22 PM
- - Tigawoods   added a couple more things. I will add the links...   Jul 31, 2013 - 8:00 PM
- - playr158   Wanted to Toss this in there http://www.mcmaster....   Sep 11, 2013 - 9:09 AM
- - Tigawoods   thanks man!   Sep 11, 2013 - 2:32 PM
- - njccmd2002   Bringing this back from dead. Called adamsrotors,...   Nov 25, 2013 - 3:45 PM
- - Fate   QUOTE (njccmd2002 @ Nov 25, 2013 - 3...   Nov 25, 2013 - 5:38 PM
- - Tigawoods   I will have to update the OP!   Nov 25, 2013 - 7:35 PM
- - njccmd2002   we have to find a source of rotors that will meet ...   Nov 25, 2013 - 8:24 PM
- - njccmd2002   ok, classic example why i need to get my own tools...   Nov 25, 2013 - 9:00 PM
- - playr158   That's actually really smart......wheel spacer...   Nov 25, 2013 - 9:53 PM
|- - Tigawoods   QUOTE (playr158 @ Nov 25, 2013 - 9:5...   Nov 26, 2013 - 11:01 AM
- - njccmd2002   yeah man, im tired of trying to get someone to do ...   Nov 25, 2013 - 10:07 PM
- - njccmd2002   just found this subaru impreza sti 326 x 30 mm ...   Nov 26, 2013 - 4:32 AM
|- - 99gt3sge   QUOTE (njccmd2002 @ Nov 26, 2013 - 5...   Nov 30, 2013 - 10:43 PM
- - Fate   QUOTE (njccmd2002 @ Nov 25, 2013 - 9...   Nov 26, 2013 - 9:37 AM
- - njccmd2002   Tiga, do you have a set of brake lines that alrea...   Nov 26, 2013 - 8:26 PM
- - playr158   326? isn't that too big for the GT4 setup? I t...   Nov 26, 2013 - 10:14 PM
- - njccmd2002   yes i know, but it will be easier to get the rotor...   Nov 26, 2013 - 10:28 PM
- - Tigawoods   300mm MAX. Let me throw that brake line info in, ...   Nov 27, 2013 - 8:20 AM
|- - Trodai   QUOTE (Tigawoods @ Nov 27, 2013 - 8...   Nov 27, 2013 - 4:09 PM
|- - bnr32celica   QUOTE (Trodai @ Nov 27, 2013 - 4:09 ...   Nov 29, 2013 - 11:26 AM
- - njccmd2002   Cool, I'll keep looking for those lines. Once...   Nov 27, 2013 - 11:16 AM
- - Malek   QUOTE (Trodai @ Nov 27, 2013 - 5:09 ...   Nov 29, 2013 - 11:52 AM
- - Trodai   my conversion (copied from my build trend in anoth...   Nov 29, 2013 - 6:31 PM
- - playr158   Just a thought....BRZ rotors are approximately 295...   Dec 24, 2013 - 1:44 PM
- - BonzaiCelica   if you see newcelica.org there is a guy who bolted...   Dec 24, 2013 - 6:16 PM
- - jeffrosie   Only 26mm thick.   Dec 28, 2013 - 11:48 AM
- - playr158   Honestly the 4mm or whatever is not going to make ...   Dec 28, 2013 - 5:20 PM
- - njccmd2002   ok, so the STI rotor sits awesome on the car, but ...   Jan 12, 2014 - 9:05 PM
- - playr158   More english prease?! The rotor sits perfect ...   Jan 12, 2014 - 9:37 PM
|- - njccmd2002   QUOTE (playr158 @ Jan 12, 2014 - 8:3...   Jan 13, 2014 - 1:22 PM
- - njccmd2002   found this on ebay, bought the last set, what are ...   Jan 13, 2014 - 1:18 PM
- - Tigawoods   make sure they dont sit higher than the rotor face...   Jan 13, 2014 - 1:21 PM
- - njccmd2002   pics... but.... to keep caliper centered.....   Jan 13, 2014 - 2:31 PM
- - playr158   Honestly, We could easily have an adaptor bracket ...   Jan 14, 2014 - 8:58 AM
- - njccmd2002   well actually no, because the caliper is not all t...   Jan 14, 2014 - 9:21 AM
- - playr158   Gotcha. Well like all you other nuts, I picked up ...   Jan 16, 2014 - 12:43 PM
- - njccmd2002   yup sti rotor   Jan 16, 2014 - 12:57 PM
- - playr158   sooooooo.........BOLT ON Rotor: Part Nu...   Jan 16, 2014 - 6:04 PM
- - Tigawoods   RE: The GT-Four Brake Upgrade   Jan 16, 2014 - 7:32 PM
- - njccmd2002   Subaru rotor? Thats good. Looks like regular imp...   Jan 16, 2014 - 8:14 PM
- - playr158   Yup BRZ, Legacy, Impreza wrx and a few others shar...   Jan 16, 2014 - 8:44 PM
- - Tigawoods   Info added! Thanks Dan! I will be adding...   Jan 17, 2014 - 11:31 AM
- - Syaoran   That's a nice find. Two questions: You remov...   Mar 25, 2014 - 8:02 PM
- - playr158   I never had dust shields on this setup with the br...   Mar 25, 2014 - 9:16 PM
- - Syaoran   So an update to this thread would be Front: ST205...   Mar 27, 2014 - 12:40 PM
|- - Tigawoods   QUOTE (Syaoran @ Mar 27, 2014 - 1:40...   Mar 27, 2014 - 12:45 PM
|- - Syaoran   QUOTE (Tigawoods @ Mar 27, 2014 - 1...   Mar 27, 2014 - 1:06 PM
|- - Tigawoods   QUOTE (Syaoran @ Mar 27, 2014 - 2:06...   Mar 27, 2014 - 1:18 PM
|- - Syaoran   QUOTE (Tigawoods @ Mar 27, 2014 - 2...   Mar 29, 2014 - 10:54 AM
- - playr158   Can a mod sticky this thread alreaddy?!   Mar 27, 2014 - 9:57 PM
|- - richee3   QUOTE (playr158 @ Mar 27, 2014 - 9:5...   Mar 28, 2014 - 1:56 PM
- - Tigawoods   yeah! sticky! still looking at rotor opti...   Mar 28, 2014 - 1:33 PM
- - njccmd2002   with a 5x14 hub change, just use oem supra rotors....   Mar 28, 2014 - 6:04 PM
- - Tigawoods   ship it to me on the east coast and then Ill ship ...   Mar 29, 2014 - 11:35 AM
- - playr158   5x114 swap only works if you don't have AWD I...   Mar 29, 2014 - 11:55 AM
|- - mkernz22   QUOTE (playr158 @ Mar 29, 2014 - 12...   Mar 31, 2014 - 6:46 PM
- - Syaoran   QUOTE (Tigawoods @ Mar 29, 2014 - 12...   Mar 29, 2014 - 8:41 PM
- - playr158   Unless you have my car or a few others here who ha...   Mar 30, 2014 - 9:23 AM
|- - Syaoran   QUOTE (playr158 @ Mar 30, 2014 - 10...   Mar 30, 2014 - 5:12 PM
- - Fate   QUOTE (Tigawoods @ Mar 28, 2014 - 2...   Mar 31, 2014 - 5:01 PM
- - Fate   FACTORY SPECS: FYI: MODEL________YEAR_____BOL...   Mar 31, 2014 - 5:25 PM
- - Tigawoods   thanks rico! Ill add that stuff tomorrow. Yo...   Mar 31, 2014 - 8:12 PM
- - playr158   QUOTE (mkernz22 @ Mar 31, 2014 - 7:4...   Apr 1, 2014 - 11:11 AM
|- - Tigawoods   QUOTE (playr158 @ Apr 1, 2014 - 12:1...   Apr 2, 2014 - 11:18 AM
- - njccmd2002   Mr2 rear hubs is another option... For awd   Apr 13, 2014 - 2:06 PM
- - playr158   ^some how I completely missed the concept of an MR...   Apr 15, 2014 - 10:59 AM
- - Tigawoods   just thinking about this the other day and how tha...   Aug 26, 2014 - 2:39 PM
- - Fastbird   I'll be ordering Rav4 Hubs, bearings, poopra r...   Sep 6, 2014 - 6:33 PM
- - olilaroche   The Centric C-TEK Drilled & Slotted Brake Roto...   Oct 24, 2014 - 1:51 AM
- - felipeandrest205   Im looking on Evo 6 brake discs. Celica brake disc...   Dec 14, 2014 - 7:08 PM
- - Tigawoods   Thanks to Fate for pointing it out to me, but I ma...   Jan 22, 2015 - 3:11 PM
- - Batman722   about 2mm IIRC. I would love to find out the exact...   Jan 22, 2015 - 5:21 PM
|- - Tigawoods   QUOTE (Batman722 @ Jan 22, 2015 - 5...   Jan 23, 2015 - 6:56 AM
- - felipeandrest205   For the rear brake rotors, I was looking at the WR...   Mar 16, 2015 - 11:06 PM
- - njccmd2002   Ok. To add more fuel to drama. I have found roto...   Mar 19, 2015 - 2:27 PM
- - njccmd2002   Found the disc.... http://counterspacegarage.com/...   Mar 19, 2015 - 4:59 PM
- - Fate   http://counterspacegarage.com/products/bra...gt86-...   Mar 19, 2015 - 6:26 PM
- - Tigawoods   ORLY??   Mar 19, 2015 - 7:25 PM
- - njccmd2002   I l know its pricy investment initially however. ...   Mar 19, 2015 - 8:54 PM
- - MGCustoms325   That's not a bad price. I spent a lot more on ...   Mar 20, 2015 - 6:22 PM
- - mi645   so? front gt4 calipers with those counterspace gar...   Mar 21, 2015 - 7:42 PM
- - njccmd2002   No,no, no. We dont know the offset specs of thos...   Mar 21, 2015 - 8:50 PM
- - Culpable04   I printed the image and while I could not get it t...   Mar 23, 2015 - 1:43 PM
- - njccmd2002   i have been looking at wilwood hats, and they dont...   Mar 24, 2015 - 9:09 PM
- - olilaroche   Does anyone have the part number for the rear st20...   Apr 20, 2015 - 6:18 PM
|- - Tigawoods   QUOTE (olilaroche @ Apr 20, 2015 - 7...   Apr 22, 2015 - 7:34 AM
- - olilaroche   Would the supra turbo bolts would be the same? Sin...   Apr 22, 2015 - 8:07 AM
- - presure2   lots of cool info in here guys good work on all pa...   Apr 26, 2015 - 11:21 AM
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