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PostPosted: Sun Aug 05, 2007 11:52 pm 
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Junior WRC

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So, is there an adapter that already exists for adding a new master cylinder?

One person suggested using one from the new Hilux/ 4-runner due to its large brakes.

I am concidering boring it out to be larger, but I am not sure what all is involved with that.

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PostPosted: Mon Aug 06, 2007 3:58 pm 
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I have read the 185 w/ abs has a 1" bore, while the other has a 15/16.

I am trying to find evo master cylinder bore, but all I can find is the evo IV model got .3 larger MC bore, but not what it was before that.

If I could determine that, I would know if the 185 system was good enough for it.

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PostPosted: Tue Aug 07, 2007 1:34 am 
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Based on the specs on the DBA website. The depth of the disc for the 205 (top of hat to back of rotor) is 59mm and the sti is only 53mm which explains why there is no clearance issues with an sti disc. The 205 rotors requires a 4mm spacer.

Some people tested wrx rotors which are have a depth of 57.5, which may require a small spacer.

The st185 depth measures 46mm.

Note, I have not taken these measurments myself, they are info from the dba catalog.

So, if these specs are right, the sti's only fitment issue is the center bore, which I am addressing.

I am looking into other rotor options, because the 2-peice rotors I wanted are 300 each, not a pair. I am thinking about powerslot rotors mostly cause of the cost. I think I may modify a hubcentric ring to act as the spacer on the wheel.

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PostPosted: Tue Aug 07, 2007 9:03 am 
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If I get a chance tonight I will measure my ST185 discs & my ST205 Bell & Rotor setup.

If someone could measure the stock St205 front discs then we have a full set :-) Woudl make a nice little article there....... hint

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PostPosted: Fri Aug 17, 2007 7:01 pm 
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Junior WRC

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Is the st205 MC a 3 bolt or two bolt? Is the RHD 185 MC a 3 bolt like the LHD models?

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PostPosted: Fri Aug 17, 2007 8:29 pm 
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From pics, it looks like it is a 2 bolt. I am curious if the st20x brake servo/booster is the same as the st205s?

If I can swap it over, then I can just find a 2bolt MC.

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PostPosted: Wed Aug 22, 2007 2:46 am 
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Junior WRC

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Found out the evo MC specs.

Here is the info given on the evo forums.

Quote:
Evo GSR's from the 5 have all used a 17/16" master cylinder, while all RS evos have used a 1" master cylinder.

So it went like this, if your evo came from the factory with brembos then it would have the 17/16" MC, if it was an RS that didn't have brembos then it would have the 1" MC.


I think I might be ok, if I get a 1" MC from an ABS 185. I am going to inquire with the evo guys how well the 1" MC handles the brembos.

This thread has a good break down on the gtfour master cylinders.
http://www.alltrac.net/phpBB2/viewtopic ... 09611b7340

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PostPosted: Wed Aug 22, 2007 5:21 pm 
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I think I am going to get a celica non-abs brake booster and get the evos brembo master cylinder (which is also a 2bolt) and adapt it to fit. Unless I come up with something better.

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PostPosted: Wed Sep 26, 2007 9:56 pm 
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Update.

Since I had the rotors and a spare hub, I wanted to verify clearance.

I tried bending the dust shield but a part wasn't wanting to bend that was touching the rotor.

Maybe if you heated it, or cut out that section, you could bend and keep your dust sheild. I removed this one so I can get a better view of the rotor fitment.

Its fits well.

As you can see, the center bore is not an issue. It does not seem much bigger, if at larger than the aftermarket 185 rotors I already have on.
The lugs fit very snug, which seem to be able to keep the rotor well placed with no slack.

Image

Here are some images to show the clearance in the back. Seems there is enough room for the rotor to fit just fine.

Image

Image

I think this is why the dust shelid didn't want to go back further.
Image

Here is the caliper placed on the rotor. Once I get pads, and can center it better I will be for sure, but it seems the mounting points for the caliper will be flush with the oem mounting points, which means a 4-hole flat plate bracket will be able to be used to mount them. I will need to take measurements from my 350z brembos vs how far they go on the disc. I want optimal pad to rotor contact, rather than wasting to top section of the pad. If it can not be low enough, I may need to offset the caliper.
Image

Since I am being laid off, I am going to try and sell my rear brembos. I am trying to reduce the cost of this project, so I will most likely use my st205 rears and get 205 rotors. If change my mind, I will buy some redrilled supra rotors and use the brembo calipers. But, I will try and sell the brembos before I do anything.

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PostPosted: Thu Sep 27, 2007 5:15 am 
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I am having a hard timing figuring out how I will mount the caliper. Its going to have to be offset from the oem mounting points. I want maximum contact with pad and rotor.

I have been seraching for ideas. The interference of the mounting points are proving to be an issue. One one side of the caliper will be close to the top of the rotor. I want the whole caliper tight.
The only thing I think I could do is make a spacer like the one in the picture, to make the caliper wider by ~15mm. I could then mount it behind the oem mounting points. But then, I would need a 15mm spacer on the inner pads so they areeven with the outter pads. I do not think this is a good solution either.

Image

I drew up an option if I am keep using this caliper. Uses grinding, which I am not keen on, but the RX7 kit uses grinding to use the porsche calipers. So If its a small amount, it might be ok. This shows, that this would not be a kit option.
Image

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PostPosted: Thu Sep 27, 2007 10:38 am 
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Can't say I'd be keen on grinding either the hub or the calliper :(

Take it that when the calliper is centralised on the brake disk there is this interference problem?

You know there is a bolt on AP Racing solution :)

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PostPosted: Thu Sep 27, 2007 3:22 pm 
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8)

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PostPosted: Thu Sep 27, 2007 4:45 pm 
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Junior WRC

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Yes, but I am trying to do this low buck. The plan was a quality BBK all around for ~1,000usd.

I am talking to an engineer about some ideas on this. Since I have an sti rotor, I am limited to my location of the caliper. If I went with a custom rotor and hat setup, this could have been worked around by changing the offset of the rotor hat. Even with a flat plate bracket, the same offset of an sti rotor could be used, but with a larger diameter disc.

I might have to scrap the whole project due to my job situation. At this point, I would rather get my car painted, then have a BBK since I will not be doing hardly and racing for a while.

I will either have to modify the caliper, get a new disc, or keep the disc and get a new caliper.

I went with the sti rotors cause I found a very inexpensive source and I was hoping to keep disc replacement after track days to a lower cost.

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PostPosted: Thu Sep 27, 2007 10:51 pm 
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Quote:
Yes, but I am trying to do this low buck

I understand, and it's nice to be a little different and take a route slightly off the usual path :)

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95 ST205 - slept for 10 years, now waking up...
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PostPosted: Tue Oct 02, 2007 6:54 pm 
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you will need more than 10mm clearance between ball joint and disc, otherwise pop..way to much heat.

brembo calipers work better with larger diameter disc,when used with smaller type , fitting becomes a pain.

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