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View Full Version : 94 GT4 Brakes on 5Gen



bobblyhead
03-18-2010, 01:52 AM
There's a guy selling his front calipers and rotors from a JDM GT4 for $400 bucks? Is it too expensive and will they fit a 5th gen GTS? I have been wanting to upgrade but don't need a big brake upgrade kit. What do you guys think?

The Captain
03-18-2010, 08:48 AM
It's not a bolt on upgrade.

grug
03-18-2010, 10:43 AM
The discs fit as the bolt pattern in the same. There is some pretty in depth mods to get the calipers to fit, custom brackets etc...
Costs a bit more, but your probably better off going one of the K-Sport 6 or 8 piston upgrade kits available on ebay.

bobblyhead
03-19-2010, 04:27 AM
Thanks for the info and input. I guess I will stick with the current set up for now. Thanks again!

85gtsblackman
03-19-2010, 04:34 AM
if u have a 90-91 celica the 92-93 gt/gts/gtx brakes are a upgrade

bobblyhead
03-25-2010, 05:16 PM
Thanks 85gtsblackman, but I have a 92 GTS, so I can't OEM "upgrade" anymore :( But a good tip for all those 90-91 guys out there :)

cms-gt4
03-25-2010, 05:40 PM
Rotors are too large but can be milled down to fit. Calipers are bolt on but need to have the ears shaved a couple mm so the rotor will clear the ball joint. Will post links later.

cms-gt4
03-26-2010, 12:53 AM
See link. I might be selling my 205 rotors now that new option ma have popped up for me.

http://homepage.ntlworld.com/r1biker/205brakesonst185.html

bobblyhead
03-26-2010, 02:47 AM
Wow! Nice! Thank you! Seems like a lot of work...but going to more pistons looks like a nice upgrade. I will keep it in mind :)

karl
04-11-2010, 06:38 PM
what is the stock piston diameter compared to the ST205?

might be worth doing a bit of research, since sumitomo makes 4 pots for a number of cars that are mostly identical, but with different names cast into the front of the caliper. for example, the later model WRX 4 pots are identical to the early 90's nissan 300ZX calipers, but with 'subaru' instead of 'nissan' cast into the side. i know the GT4 celica calipers are also sumitomo.

also, is anyone doing the math for these 'upgrades?' are there any calculations available that spell out how it affects brake bias? a lot of people mistakenly think the prop valve controls the brake bias, when it's actually the hydraulic and mechanical ratios front to rear. the prop valve only reduces rear brake pressure at higher line pressures to prevent the rears from locking first. i know i spent quite a bit of time doing calculations when i upgraded my brakes.

cms-gt4
04-11-2010, 09:27 PM
st205 shares the same master cylinder piston bore as the 185.

karl
04-13-2010, 04:05 PM
sorry, i meant caliper piston diameters. master cylinder piston diameter is irrelevant to brake bias (assuming tandem MC of equal diameters, which most toyotas are).