GR86 GR86 - Brake Upgrade Guide
- Thread starter Will300
- Start date
No standard OEM rear disc won't work as they are 290mm. You need discs from the Performance Pack equipped cars, with 316mm.
There's lots of options for DBA discs that are instock, just the 4000 plain which are currently out of stock.
Plain: https://www.dbabrakes.co.uk/discbrakes?number=32001&name=DBA2656-10
Street T2: https://www.dbabrakes.co.uk/discbrakes?number=32235&name=DBA2656S-10
4000 - T3: https://www.dbabrakes.co.uk/discbrakes?number=22837&name=DBA42656S-10
Kit: https://www.dbabrakes.co.uk/discbrakes?number=89838&name=DBA42656-10-1521XP
Another option: https://www.centricparts.com/disc-brake-rotor-6853991
Pad shape: WVA number
21580, 23323
They are a common brembo pad shape, used on Evo's, STi, Nissans, etc, so there is lots of pad choice.
I've updated the rear caliper document/spreadsheet in post #7, if anyone is looking to purchase a rear caliper setup. Included a cheap and premium option, and prices.
Brembo Rear Caliper Parts Spreadsheet
Brembo Rear Caliper Parts Spreadsheet
Alistair31
Totally Hooked
I went for Ferodo DS2500 as that’s what I’ve got at the front as part of the Godspeed kit.
Alistair31
Totally Hooked
Godspeed kit arrived in good time. Shame I need to wait weeks on a fitting slot.
hsb
Obsessed member
It's a simple job replacing them yourself, just a bit of a mess with the brake fluid in the hoses
S18RSG
Totally Hooked
Morning all.
Just had an email from Ian at Godspeed. The rear kits are now in stock. This includes a set of new STI calipers (powdercoated in a colour of your choice), 316mm discs, pads and all necessary fitting equipment.
They bought in 5 sets of calipers as a trial to see how they sell. They're available to order now at £695.
Thanks to @Will300 and his continued work on this, we can see that doing this yourself would cost approx £672, so you're paying £23 more to have a full kit from one place. Pretty impressive value.
To order, email: [email protected] and don't forget to say you got referred from here. The more support he gets from here the more I can improve our terms of supply
Just had an email from Ian at Godspeed. The rear kits are now in stock. This includes a set of new STI calipers (powdercoated in a colour of your choice), 316mm discs, pads and all necessary fitting equipment.
They bought in 5 sets of calipers as a trial to see how they sell. They're available to order now at £695.
Thanks to @Will300 and his continued work on this, we can see that doing this yourself would cost approx £672, so you're paying £23 more to have a full kit from one place. Pretty impressive value.
To order, email: [email protected] and don't forget to say you got referred from here. The more support he gets from here the more I can improve our terms of supply
mackie
Totally Hooked
Are they OEM disks and pads out of interest? Does "fitting equipment" include new hoses? Seems like a good option, especially if I can colour match the fronts.
S18RSG
Totally Hooked
For those considering the Godspeed kit but looking at colour options, I can confirm the powdercoating quality is superb.
Luckily I have the car booked in to get these fitted tomorrow, so not too long to sit and look at them.
Luckily I have the car booked in to get these fitted tomorrow, so not too long to sit and look at them.
KobayashiMaru86
Totally Hooked
Need to start looking into this. And have to find a garage local I can trust. Many won't fit parts you bring unless OEM or they supply it.
KobayashiMaru86
Totally Hooked
@Alistair31 Following this with great interest mate. I'm pretty sure Duncan at Hypertech will do a sound job. Let me know how it all turns out (costs etc) as I might have to do something with mine and get it in before Duncan decides to retire in the next year or so ...
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S18RSG
Totally Hooked
I will be mate, in time. Just need to let funds recover a little bit, have a busy few months ahead haha.
Talking to Godspeed, learned that they have a kit prepared for the GC8 that is a bolt on and keeps BRZ brake bias (calculated and update the brake bias file, will upload later here). Would not need to change rear caliper/rotor, saving mass where is not needed to upgrade.
Probably this will be my go to as I did not have a response from Reyland for a 304 rotor with the 9200 ap calipers (which was my preferred solution earlier).
godspeedbrakes.co.uk
Probably this will be my go to as I did not have a response from Reyland for a 304 rotor with the 9200 ap calipers (which was my preferred solution earlier).
Subaru Impreza GC8 300mm Brembo caliper kit
2 piece 300mm x 28mm 2 piece discs and new Brembo 4 pot calipers Aimed at the early 'classic' GC8 Impreza , this kit is ideal as it fits under the standard 1998 16" factory fitted wheels , much lighter and more powerful than the standard heavy steel Subaru 4 pots. This is a complete brand new...
godspeedbrakes.co.uk
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mackie
Totally Hooked
The 330mm Reyland kit will be absolutely fine but they’ve not been good at answering their emails recently.
The 330mm Reyland shifts the bias forward, for a proper balance of geometric bias, requires rear PP Brembos. I do not see a reason to upgrade the rears as I do not see any fade or degradation on those.
mackie
Totally Hooked
Overall I prefer setting my cars with a good geometric balance, so I can choose rear pads with lower overall friction and better modulation, that normally allows the ebd to work better, get shorter stopping distance and reduce likelihood of issues.
But I am sure others may differ and run different setups.
Sometimes, more front bias may work well. Specifically when you’re reaching much higher deceleration levels than initial setup. This can hurt trail braking sometimes. Anyways, trial and error and finding what works for your setup (tires, suspension, weight, aero) is not a cookie cutter.
