GrimmSpeed Master Cylinder Brace

Part #: GRM 091029
MSRP: $104.99
( 60 reviews )


   In Stock: Ships the Same Day
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This product is covered by our
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No questions asked 30 day return policy


Brand: Grimmspeed
Color: Black
Installation Hardware Included: Yes
Location: Master Cylinder
Material: 12L14 Carbon Steel
Mfgr. Warranty: 2 Years
Return Policy:

RallySport Guarantee - 30 Days

Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.
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Subaru Impreza
WRX STI Hatchback 2008, 2009, 2010, 2011, 2012, 2013, 2014WRX STI Special Edition Hatchback 2010WRX STI Limited Sedan 2011, 2012, 2013, 2014WRX STI Limited Hatchback 2011, 2012, 2013, 2014WRX STI Sedan 2011, 2012, 2013, 2014WRX Sedan 2008, 2009, 2010, 2011, 2012, 2013, 2014WRX Hatchback 2008, 2009, 2010, 2011, 2012, 2013, 2014WRX Premium Sedan 2010, 2011, 2012, 2013, 2014WRX Premium Hatchback 2010, 2011, 2012, 2013, 2014WRX Limited Sedan 2010, 2011, 2012, 2013, 2014WRX Limited Hatchback 2010, 2011, 2012, 2013, 20142.5 GT Sedan 2009, 20102.5 GT Hatchback 2009, 2010
Subaru Legacy
GT spec.B 2008, 2009GT Limited 2008, 2009

GrimmSpeed has provided a quality product that will eliminate the brake pedal flex in your vehicle. Some vehicles may have inherent master cylinder flex at the firewall which can take away from the feel and response of your brakes. The GrimmSpeed Master Cylinder Brace bolts up onto the chassis or firewall, and will fit in between the firewall and master cylinder providing.

The end result will be a solid brake feel, and better braking response, and all that excess pressure that otherwise, would be wasted in the firewall flex, will be used thoroughly in the braking system.

The GrimmSpeed Master Cylinder Brace has been crafted from CNC laser cut 12L14 with multi-point welded fabrication. This is a nuclear bomb surviving component with 5 factory mounting points, which is the most available from any brace. These are finished in a black powder-coated finish, and will restore that precision braking feeling

REVIEWS ( 60 )



Great Upgrade
chraxter 22 days ago
So as everyone has stated, this is a total pain to install. Expect to have your hand and wrist chewed up at the end of the install. This really did firm up my brake pedal and made it much more consistent. I would recommend this to anyone that wants a firmer, more predictable brake feeling. The build quality is awesome! Very, very sturdy bracket. INSTALL TIP: Put tape on the bolt end before you place it in your socket. I used electrical tape. The makes the bolt a little tighter in the socket so it doesn't fall out when you're using your ratchet at weird angles. The hardest bolt for me was the very first bolt that you put in the bracket, but once I used the tape it made it so much easier. Hope this can help everyone out!

Pain in the a$$!
DSC4WRX 2 months ago
Installed on my '12 WRX with no other modifications to the oem brake system. The quality and construction of the GS product was remarkable. However, installing this piece was, for lack of a better phrase, a pain in the a$$. The top bolt hole, using one of the three small bolts, lined up perfectly with a brake line. That proved extremely difficult to remedy and caused many injuries and frustrations. The two bolt holes on the bottom of the obstructive brake line caused a lot of cuts and bruises as well; although, I figured out at the end that installing these two bolts from the bottom of the engine bay would have been easier. The two long bolts and fuel line bracket, hate those too. Specifically, the area of the two long bolts had little to no room to work with; threading these in, even with tools, was very difficult. Upon completion of the install, I had to rearrange the lower fuel line that was removed for this install. Testing out the brace, I was less than satisfied with the results. Considering how difficult it was to put in, I wanted to justify the purchase by telling myself the performance would be worth it; it was not. If there is a next time, I would not get a brake master cylinder brace and I would not recommended it. Too much work for little to no real effect. P.S. I spent about five hours on this project. Dropped the bolts many times too due to the lack of work space.

Brake master brace
Alex1313 2 months ago
Such a pain to install that I dropped and lost two screws I gave up on I stalling it and now it is just sitting there

Not all braces are ugly
Darament 2 months ago
The brace came well packaged and no scratches looked great. I kind of wish it came in different colors but the black finish is still nice. The master cylinder brace wasn't too bad to install as long as you have an assortment of different length extensions and whatnot to swap out. Having small hands would make this install a whole lot easier. I did not have any problem with the install other than the fact that you need to install the thing to improve braking performance. That's more a problem with the design of the car more than the brace.

Confirmed Fitment for Forester SH
mg_lao18224 2 months ago
Firms up the spongy pedal feel of brake pedal which is caused by flexing of the firewall. Effectively provides predictable brake pedal feedback and positive brake response.


  • AnswerQ: Fits 2015 STI?  FE 1 month ago

    Does this fit the 15 or you just need to use a longer bolt or something?

    • A: i would like to know this as well, if it fits ill be ordering 1!

      spyounger41670 1 month ago

    • A: i would like to know this as well, if it fits ill be ordering 1!

      spyounger41670 1 month ago

  • AnswerQ: Please Confirm Material  Ferny 5 months ago

    Can you please confirm the steel alloy that this brace is made from? Ledloy (12L14) is generally not suitable for applications requiring welding (high sulfur content causes the welds to have a habit of failing). Thanks.

    • A: Grimmspeed was able to respond to this inquiry and we will be removing the 12L14 label. They mentioned the labeling was outdated and had not been altered for a few years. They are constructed out of mild steel and then powdercoated and they have not had any issues with weld failure.

      Nick S. 5 months ago

  • AnswerQ: master cyl. brace fits??  buc2013 2 years ago

    will grimmspeed mstr. cyl. brace fit 2011 impreza 2.5i non turbo hatch automatic ???

    • A: This will only work on the Turbo models listed. Mike

      sales559bb8b6bb86418e5b8c258d 2 years ago

    • A: This brace is only confirmed to fit WRX/STI models as well as Legacy models.

      Kyle A. 2 years ago

    • A: It fits perfectly fine. I hand no issues installing this on my 2009 2.5i NA automatic sedan.

      evaradar 12 months ago

  • AnswerQ: light braking  Gamil 3 years ago

    Obviously this will have the greatest impact on heavy braking, how about on light braking? e.g. rush hour/around town?

    • A: The master cylinder brace helps prevent the firewall flex when the brake is pressed. Keeping it from flexing will help improve brake feel across the board. The further down the pedal is pressed the more affect this brace will have. :) Yes, it will help light braking as well.

      Matt G. 3 years ago

  • AnswerQ: Right hand drive  Rob 3 years ago

    Will this fit a 2010 right hand drive WRX?