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Perrin Master Cylinder Brace
Perrin Master Cylinder Brace
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Old 08-24-14, 11:30 AM   #1
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Default Perrin Master Cylinder Brace

An FYI for anyone wanting a master cylinder brace. While Perrin only shows that it is compatible with the 08-14 WRX/STi, I can confirm it does fit on my 2015 STi. All the holes line up and everything bolts in properly. However, you will need a longer bolt (M12x1.75) about 3" longer than the bolt that comes with the kit. Other than that everything fits perfect. I am not sure whether or not the master cylinder just sits farther back inside the car or is shorter in itself. i did not get that far.

Perrin Master Cylinder brace found here: Master Cylinder Brace for 2008-14 STI



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Old 08-24-14, 07:58 PM   #2
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Default Perrin Master Cylinder Brace

How was the install? Daily easy, or was it a bitch to do? Do you notice any difference?
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Old 08-24-14, 08:11 PM   #3
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Default Re: Perrin Master Cylinder Brace

Any brace on the market will make a significant noticeable improvement. The pedal feel is more linear after I installed my cusco brace.
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Old 08-25-14, 05:39 AM   #4
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Default Re: Re: Perrin Master Cylinder Brace

Quote:
Originally Posted by 9900rpm View Post
How was the install? Daily easy, or was it a bitch to do? Do you notice any difference?
Took me about an hour and a half by myself with going to the store in between. I wouldn't say a bitch, but definitely difficult. Just a lot of stuff in your way. Yes there is a big difference in braking. The pedal feels more firm and the braking comes on quicker. Overall I think it's well worth the money. I got mine from a buddy that parted out his 14, so I got it a little cheaper, but I would've bought one new.
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Old 09-23-14, 03:00 PM   #5
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Default Re: Perrin Master Cylinder Brace

I installed this also on my 2015, new bolt needs to be M12x1.75x110.

The 110mm length was impossible to find locally, so I got it online from mcmaster-carr
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Old 09-23-14, 03:06 PM   #6
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Default Perrin Master Cylinder Brace

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Originally Posted by crazzy View Post
I installed this also on my 2015, new bolt needs to be M12x1.75x110.

The 110mm length was impossible to find locally, so I got it online from mcmaster-carr

Did you put anything at the end of the not like the cusco brace or do you just have the bolt holding it in place?
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Old 09-24-14, 05:32 AM   #7
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Default Re: Perrin Master Cylinder Brace

nope, just the bolt. i'd be wary about something in between them, might introduce flex. and the whole point of this brace is to eliminate flex

another point, is that the bolt is not perfectly lined up with the brace, so it hits it at an angle. putting something on the end of the bolt like the cusco brace would probably break off, due to the pre-load/you pressing on the brake pedal.
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Old 09-24-14, 06:02 AM   #8
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Default Re: Perrin Master Cylinder Brace

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Originally Posted by crazzy View Post
nope, just the bolt. i'd be wary about something in between them, might introduce flex. and the whole point of this brace is to eliminate flex

another point, is that the bolt is not perfectly lined up with the brace, so it hits it at an angle. putting something on the end of the bolt like the cusco brace would probably break off, due to the pre-load/you pressing on the brake pedal.
the cusco brace (like what i have) includes an aluminum pivot disc. This distributes the force to the entire end of the cylinder, instead on concentrating it to one point. There is no additional induced flex with the pivot disc, as it is made of aluminum. The adjustment bolt is also much shorter with this unit. Id be more wary of the longer bolt of the perrin. With the length added to the small contact point, its more prone to "walk" and flex off its contact point.
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Old 09-24-14, 06:49 AM   #9
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Default Re: Perrin Master Cylinder Brace

In theory, yes, it could walk, however, the pre-load applied to the bolt, along with my choice of a 316 SS bolt, should mitigate those issues.

In the end, if I didn't have a trackday fast approaching, I might have waited for a revised perrin design since i prefer their implementation that has triangulation of the brace itself. I personally am not confident in the Cusco design, as its just a right angle design, instead of a full triangulation. Depends on the strength of the wall of sheet metal of the strut mount. Which is an unknown since we don't have Subaru's CAD data.
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Old 11-19-15, 05:24 PM   #10
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Default Re: Perrin Master Cylinder Brace

Just installed the Perrin triangular design. Install was definitely difficult. Instructions have you working from the top, save yourself plenty of cursing and use ramps. Much easier to do the whole install from the bottom of the engine bay.
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