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Girodisc (rear) clearance issue

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Old Jun 19, 2018 | 06:59 AM
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Girodisc (rear) clearance issue

Guys & Gals!

Today I've tried to install rear Girodisc 2-piece rotors and... it didn't work There's no clearance and brake pad itself "rubs" connection bolts on aluminum hat.
There are just a few mm but it's iron-on-iron and... I'm not sure it's the way things should work.

Question: What could possibly go wrong? I can of course bore some metal from pad to make the compound shape match the one on the metal basement, but I'm not sure it's a way to go.

Thanks!

Anton

P.S. I've used Performance Friction and Brembo 2-pcs rears and it never was like that
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Old Jun 19, 2018 | 07:22 AM
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Hey Anton

Can you post up the Girodisc part no. used?
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Old Jun 19, 2018 | 08:59 AM
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A2-008

I'll make a picture of the disc hat if required. Tried many pads like Ferodo 25oo, endless CC-RG and original Brembo OEMs. These aren't pad issue for sure.
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Old Jun 19, 2018 | 10:11 AM
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Did you use the caliper spacers?

The Girodisc system is a direct replacement for the OE disc with the addition of our provided caliper spacers. Our rotor is slightly larger than the OEM rotor at 380mm versus 365mm providing greater braking force and cooling capacity.
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Old Jun 19, 2018 | 10:56 AM
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Originally Posted by kaj
Did you use the caliper spacers?
Where does it say that?

http://www.girodisc.com/Girodisc-2-P...89_p_5528.html
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Old Jun 19, 2018 | 11:15 AM
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Originally Posted by letsgetthisdone
https://www.evasivemotorsports.com/m...xoCcdwQAvD_BwE
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Old Jun 19, 2018 | 12:59 PM
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Evo 6-9 doesn't use any spacers on the rear, these discs are 100% bolt-on. Or they should be

http://www.girodisc.com/Girodisc-2-P...89_p_5528.html

Originally Posted by kaj
Did you use the caliper spacers?
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Old Jun 19, 2018 | 01:24 PM
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Originally Posted by KOOLER
Evo 6-9 doesn't use any spacers on the rear, these discs are 100% bolt-on. Or they should be

http://www.girodisc.com/Girodisc-2-P...89_p_5528.html
No worries. I just saw what Evasive had on their website so wanted to share. I can't imagine what could be causing your problem. Good luck, man. I hope you get it sorted. :cheers:
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Old Jun 19, 2018 | 10:07 PM
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Thats gotta be a note for a different car. 8/9 rear rotors aren't even 365mm from the factory. Hell, the fronts aren't even that big lol
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Old Jun 19, 2018 | 11:09 PM
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Found a little something about it in this thread: https://www.evolutionm.net/forums/ev...ever-seen.html

Looks like you either need to trim the pad or buy certain ones that are curved according to Girodisc.
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Old Jun 20, 2018 | 07:47 AM
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Great read! Thank you

Trim won't help as they will scrub either way...

OK, I've made some pictures today.



So this is pad on the disc. There's no clearance on the "bolt" side but lots of pad goes "offsite". It shouldn't work like that


OK, this is actual disc. Text is correct.


Originally Posted by ayoustin
Found a little something about it in this thread: https://www.evolutionm.net/forums/ev...ever-seen.html

Looks like you either need to trim the pad or buy certain ones that are curved according to Girodisc.
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Old Jun 20, 2018 | 07:48 AM
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...and this is how it looks from top view.

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Old Jun 20, 2018 | 09:37 AM
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Definitely odd. Maybe contact Girodisc and see what they have to say.
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Old Jun 21, 2018 | 04:08 AM
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OK, so I'm an idiot... Guys, when you buy used stuff make sure you really understand what to do

In a nutshell: what i see is NORMAL. Rear brake pads has to be trimmed with Girodisc 2 pcs rotors.

Here's what Girodisc guys replied:

--

Anton,

Hello and thank you for getting in touch, our rotors do require the pad backing plate to be machined or ground down to match the arc of the pad material so that it clears our rotor hat and hardware. We include a disclaimer/template with these rotors explaining what needs to be done, I have also attached it to this email in case you missed it in the rotor box. This is necessary because we can’t physically make the hat any smaller due to the size of the parking brake, we need a certain amount of space there for our hardware arrangement.

All of the pads that we sell, our Magic, S/S and the ST43 from Raybestos, all come machined from us so they are plug and play. Ferodo also has a shape that does not need to be modified.


Let me know if you have any other questions, thanks!



Mike Owen
Girodisc Racing Brakes
3550 Meridian St. #6
Bellingham, WA 98225
Office: 360-306-3263 ext. 103
Fax: 360-306-3264

s
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Old Jun 21, 2018 | 06:21 AM
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That would have been handy for the seller to let you know
glad you got it figured out ,though.
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