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Brake hypothetical: Can I install Evo X's front calipers to the rear?

Old Jun 15, 2018, 05:41 PM
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Brake hypothetical: Can I install Evo X's front calipers to the rear?

Many enthusiasts and forum members install aftermarket front calipers and then cheaply sell the OEM front calipers. I feel this might not be the most efficient way to play. So have anyone tried to fit the OEM Evo X front calipers to the rear? These calipers do appear to have similar mounting brackets from this picture:



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Old Jun 20, 2018, 02:01 PM
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The rotors are different sizes, the pads from the front would only partially clamp onto the rear rotor. The mounting position is likely not the same either, in terms of the rotor offset to the hub.

My vote is: would not work
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Old Jun 20, 2018, 02:06 PM
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Also the fit would not be the only problem. You would also be adding calipers to the rear with a much greater volume of fluid needed to activate. I think you would run into proportioning problems, the master cylinder only moves so much fluid and the rear gets a smaller amount. So you may in fact get a smaller clamping force in the rear by putting a larger caliper on. You would probably need to upgrade the master cylinder and brake distribution.
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Old Jun 20, 2018, 02:20 PM
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A good question for sure

You would have to run the larger rear rotor to fit the caliper. The braking dynamics in the rear would be way off the charts IMO (way too much rear rotor clamp load)

It would be a very unhappy brake system w/severe Bias issues

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Old Jun 20, 2018, 04:29 PM
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This is not a viable option for a number of reasons. Even if they would fit, this isn't a good idea.
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Old Jun 20, 2018, 08:43 PM
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Thanks for the inputs, gentlemen. There is an offset different between the stock front (350mm; p/n 4615A024) and rear (330mm; p/n 4615A025) rotor hats. I guess the rear rotors need the offset to accommodate drum handbrakes. So to make it work, I have to first get rotor hats like the Girodisc ones with the offset for the rear, and then find 350mm rotor rings that will fit these hats. It would be very finicky at least, and then I could run into the issues like brake bias as mentioned above.

I saw Bulletproof's Continuum (Z4 with Varis body kit) having the same brakes for both front and rear, and that was what inspired my question. Our cars have amazing brakes from the factory, albeit the weakness on the rear, which is instantly noticeable when you rotate the car through a corner with left-foot braking. The current solution is aftermarket brake kits, but those have a limited selection of replacement brake rotors and pads. The stock brakes have the widest selection, including many lightweight rotors and bang for the buck semi-metallic race pads and ceramic daily pads.

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Old Jun 20, 2018, 08:55 PM
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I would love to copy what Ken Thwaits has done to his 1st place finishing Optima Street Car Challenge EvO
Wilwood 6 pot front & 4 pot rear


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Old Jun 21, 2018, 01:03 AM
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An easier solution would be to run super aggressive pads on the rear.
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Old Jun 21, 2018, 03:43 AM
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What rims are they?! ^^^
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Old Jun 21, 2018, 01:13 PM
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I put Wilwood 4 pots on my rear s

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Old Jun 21, 2018, 01:29 PM
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Originally Posted by Mick_O View Post
What rims are they?! ^^^
They are: Forgeline One Piece Forged Monoblock GS1R. They are 19" but not sure of the offset or width
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Old Aug 30, 2018, 12:34 PM
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Yeah grippy rear pads can really help these 4WD cars out under braking. Made a big difference on my car.
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