Been looking at a brake upgrade but when trying to find a suitable caliper you get asked for all sorts of dimensions.

Suitable Disc Ø. Disc TH, Mtg Centres, Mtg Offset, Mtg Hole Diameter & PL

what do they all mean??? and what sizes should I be looking for.

The discs must fit under 16" wheels (whats the maximum sized disc I can choose?) other than that they must fit the st205

any help would be appreciated.

Under 16" wheels you will be lucky if you can incraese much past the std 315mm. You may squeeze 325mm depending on caliper.

I assueem you are looking at bells & rotors?

Here is a pic of std size ST205 bells & rotors that I had on my red ST205


I still have one which I can measure if you wish. Some scottish origin fellow ran off with one and seems to have forgotten he has it

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JP
GT4DC Treasurer

Grey St185 RC
Silver BMW E46 M3
Multicolour yawn Honda VFR400
Silver Honda Civic Type-R

I guess if I dont increase the rotor size beyond standard I may as well stick with the standard disc/caliper set up.

OK then what size can I fit under 18" alloys?

I have been looking at getting either Alcon or AP Racing calipers but for dim wits like me they dont simply say.."Fits Toyota Celica" you have to know all sorts of sizes and I dont have my car anywhere near me to measure.....even if I did I have no idea what to measure?????

5x100 bolt pattern i beleive, a rare pattern (suby's share this pattern, hence the high offset options)

No offence, but why would you want a different set in roughly the same size as stock? I thought 205 brakes (albeit with aftermarket pads (and discs)) were quite up to their job? Making the car lighter not an option?

18" should fit over 14" brakes, expect 3k+ GBP for a decent set though.

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René - Carlos Sainz 2433•5000
Turbocelica.nl | ST185 CS restoration and full rebuild

If it ain't broken.. it soon will be

Here are some options:
TAROX
http://www.europerformance.co.uk/pages/products/category_results.mhtml?category=tarox10potbrakekits&car=toyotacelica&manufacturer=tarox&sub_category=1
http://www.europerformance.co.uk/pages/products/category_results.mhtml?category=tarox6potbrakekits&car=toyotacelica&manufacturer=tarox&sub_category=1
K-SPORT
http://www.ksport.co.uk/order.asp?id=360&loc=2
http://www.ksport.co.uk/order.asp?id=247&loc=4

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Vice Chairman
1990 White UK Celica ST185 - Project DTM
1997 Cream BMW R1200C (as seen in James Bond "Tomorrow Never Dies")
2005 Jaguar X-type 3.0 Sovereign AWD Automatic
Blood Bikes - https://www.freewheelers.org.uk/

i havent bothered to be fair, carbotech pads and standard discs on mine and the stopping power is absolutely immense, other than weight, as above i cant see much point in changing

That was another option I have looked at and if I was sticking with the standard pedal box I would have chosen, but I`m replacing the pedals and there will be a non servo assisted brake set up so I think I will need as much help as possible....or legs like Tessa Sanderson

i could find out how much i could get some k sport 6 or 8 pots for, my friend can usually do good deals on brakes.

but i dont know much about k sports

Any idea what pedal box Nial?

IIRC Don's 355? disk with AP calipers was besigned for a Tilton job but this has since been superceeded

Servo/non assisted boxes tend to be different in the position of pivot points and trade travel for effort required. Someone somewhere does an adjustable version where the distance between pivot and actuator rod can be varied. Or maybe that was an idea I had

I've kept the original pedal setup on my ST205 track build but the master cylinders are designed for adjustable front to rear brake bias. All of that is bespoke. Working out the correct spec of master cylinder is a bit of a black art so I've relied on JEMS to make the call on what size of master cylinder to use. We might find we have to experiment a bit with the setup to get it spot on.

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Don
GT4DC Chairman
1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
1994 Toyota Celica GT-Four Special GT 590bhp @ 1.8bar
1989 Van Diemen RF88/89 Formula Ford 1600
2008 Nissan Patrol GU 3.0L ZD30DDTi 154bhp

That would certainly make life an awful lot easier.

Not entirely sure yet..I like the look of the AP Racing pedal box but i have only seen floor mounted version, I would like it bulk head mounted, I`m not sure if there is much space in a ST205 for a foor mounted pedalbox.

I also havnt done the crazy sums to see what size brake cylinders I would need which might dictate the availability of a pedal box.

The cogs in my brain are whirring and grinding but I can't think how this can be done. Would be interested to know.
The usual cheat is to put a variable pressure regulator in-line but it's not quite the same thing.

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If at first you don't suck seed, try drier grain.

two master cylinders, front and rear circuits with a threaded bar between them. the pedal is attached in the middle with a threaded sleeve. turnine the threaded rod moves the pedal contact side to side and varies the pressures applied to either master cylinder. Eas to google for pics than explain