Wilwood/ST205 guys, master cylinder issues?

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Wilwood/ST205 guys, master cylinder issues?

Postby Simba » Mon Apr 14, 2008 9:36 pm

If anyone is running the Wilwood 120-8466 4-pot front calipers with the ST205 rear calipers, I'd like to hear from you regarding pedal travel and feel. I'm having a few issues with my setup and am wondering if it's a master cylinder capacity issue that other people have run in to, or if it's the evil air spirit randomly filling my lines. :twisted:
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Re: Wilwood/ST205 guys, master cylinder issues?

Postby Simba » Mon May 07, 2012 11:55 am

I'll update my post from a million years ago as I've had a couple questions about this setup-- short answer is it doesn't work. Not enough volume to drive both the 4-pot wilwoods and 2-pot 205 rears. Tried both masters, all possible permutations of booster, no dice.

Probably needs something like a 1-1/8" master with an ABS delete to run it effectively.

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Re: Wilwood/ST205 guys, master cylinder issues?

Postby ALLensTRAC » Mon May 07, 2012 12:12 pm

Well Shit! That is the exact setup I have in my garage. Just curious but does your car have the ABS deleted? I thought from reading on a couple different forums that the master was ample? Is there any aftermarket options available i.e. Wilwood? Our master is a 1" correct? I will have to do some more research now that you brought this up. My setup is Revolution fronts(superlites with supra rotors redrilled) and 205 rears just for reference. I have yet to drive it with this setup so I don't have any comments on feel to contribute yet.
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Re: Wilwood/ST205 guys, master cylinder issues?

Postby klue » Mon May 07, 2012 2:47 pm

ABS MC is 15/16s, non abs is 7/8s
Ive got the willwood 4 pots in fron st205 in the rear, I ended up completely removing all the stock lines, PP valve EVERYthing and ran my own set up. pedal travel is very slightly more than I like but its easy to modulate which is good, makes it easy to roll onto the brakes.
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Re: Wilwood/ST205 guys, master cylinder issues?

Postby underscore » Mon May 07, 2012 4:09 pm

So will I need to fully delete my ABS brick before I can run the 4 pot Brembos?
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Re: Wilwood/ST205 guys, master cylinder issues?

Postby Corey » Mon May 07, 2012 4:22 pm

^^ Win Win ;)

I'm curious how René's car is coping with his setup. I think it still had ABS installed while the AP and 205 rears were bolted on.
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Re: Wilwood/ST205 guys, master cylinder issues?

Postby phattyduck » Mon May 07, 2012 5:39 pm

I am running the Porsche Brembo fronts with ST205 2-pot rears on a 7/8" master cylinder without any troubles (no ABS though)... What are the piston diameters on your Willwood fronts?

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Re: Wilwood/ST205 guys, master cylinder issues?

Postby ALLensTRAC » Mon May 07, 2012 6:13 pm

Maybe this an issue with track cars only? I know that klue tracks his car and I think simba does as well. I hope mine ends up ok.
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Re: Wilwood/ST205 guys, master cylinder issues?

Postby underscore » Mon May 07, 2012 6:52 pm

Corey Darling wrote:^^ Win Win ;)

I'm curious how René's car is coping with his setup. I think it still had ABS installed while the AP and 205 rears were bolted on.


Well I won't be deleting it until next winter when I pull the motor. And my parts car up and ran away! Oh well.
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Re: Wilwood/ST205 guys, master cylinder issues?

Postby Corey » Mon May 07, 2012 6:59 pm

Keep an eye on the gt4oc for "kits" people sell when they part out their cars. They are actually pretty common over there. That's where I bought mine.

And it can be done in half a day with the motor in the car.
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Re: Wilwood/ST205 guys, master cylinder issues?

Postby klue » Mon May 07, 2012 7:54 pm

My track issue with the brakes is that I have to push the pedal to far to properly heel and toe, street issue is I just prefer a taller pedal(mostly for the same reason LOL)

If you had a 1" MC i think it would be perfect. Saying that its very hard to properly bleed the brakes and eliminate all the air. I use standard 2 man bleeding first, along with reverse bleeding to get the best results.
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Re: Wilwood/ST205 guys, master cylinder issues?

Postby underscore » Mon May 07, 2012 8:03 pm

I've never been on GT4OC but I'll have to sign up. If it's only a half day job I may as well do it sooner rather than later.
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Re: Wilwood/ST205 guys, master cylinder issues?

Postby GT4_DRED » Fri Mar 08, 2013 1:31 pm

Has anyone tried this on a 165? I'm currently running the Wilwood 4pot kit on the front and have had the 205 rears sitting forever. I'm thinking it's time to install them, but I'm not sure of the 165s MC size (no abs)?
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Re: Wilwood/ST205 guys, master cylinder issues?

Postby lumbercis » Fri Mar 08, 2013 3:56 pm

Simba wrote:I'll update my post from a million years ago as I've had a couple questions about this setup-- short answer is it doesn't work. Not enough volume to drive both the 4-pot wilwoods and 2-pot 205 rears. Tried both masters, all possible permutations of booster, no dice.

Probably needs something like a 1-1/8" master with an ABS delete to run it effectively.


Then how do ST205's run 4 and 2 pot brakes with ABS? I don't think their master cylinders are unusually large. The MKIV Supra has 4+2pots w/ABS and their master cylinders aren't over 1" AFAIK.
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Re: Wilwood/ST205 guys, master cylinder issues?

Postby GT4_DRED » Fri Mar 08, 2013 4:58 pm

klue wrote:My track issue with the brakes is that I have to push the pedal to far to properly heel and toe, street issue is I just prefer a taller pedal(mostly for the same reason LOL)

If you had a 1" MC i think it would be perfect. Saying that its very hard to properly bleed the brakes and eliminate all the air. I use standard 2 man bleeding first, along with reverse bleeding to get the best results.


Did some more searching on here and found that the st165 master cylinder is as follows:

non-ABS: 15/16"
ABS: 1"

Can anyone confirm this? Seem like the abs mc would make the setup work? I'm gonna throw the rears on anyway and go from there, as it seems that most of the info I'm finding is for fitting on a 185.
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