Toyspeed.org.nz Message Board

by **RedMist** » Wed Mar 28, 2007 11:36 am

Pre 96 rally regs force me to discard the 4 pot brakes on the front of the celica. I'm forced to go 2 pot, but want to ensure that I have a the best replacement for the beautiful 4 pots currently on the car. Anyone know of a suitable large 2 pot slider brake caliper that I can use on the existing vented disks?

by **sergei** » Wed Mar 28, 2007 11:46 am

What stupid regulations! Can't you get exception of being factory items produced from 93?

by **RedMist** » Wed Mar 28, 2007 11:53 am

sergei wrote:What stupid regulations! Can't you get exception of being factory items produced from 93?

2.5 Brakes
No four pot front brake calipers
No adjustable pedal boxes.

Buggar.

I need to modify them anyway. I cant fit 15 inch rims on them and 16 inch rally tyres are non-existant.

by **big_boy** » Wed Mar 28, 2007 12:22 pm

what size are the stock disks also what is the mounting sizes

hole-hole & draw a string line from hole-hole & measure to the top of pads (take it you new that)

also are you resturcted to a slider because i know of 2 good posablitys if you can use 2 pot solids

by **strx7** » Wed Mar 28, 2007 12:58 pm

ST185 GT4 run OK sized 2 pots.
Mazda Eunos 800's run fairly large twin pot calipers
BG Legacy GT Twin Turbo's run twin pot fronts are about the same as GT4

by **strx7** » Wed Mar 28, 2007 1:00 pm

what size is the factory disc? cause i dont think you'll be able to fit 2 pots and your std discs into a 15 inch rim

by **RedMist** » Wed Mar 28, 2007 3:16 pm

ST205 disks are 315mm, however I'll have to cut that down in order to fit the 15's anyway. As such I'll just modify it to suit the calipers.
Is the ST185 twin pot a slider? or a pot either side?
It may pay for me to just swap the 185 disk and caliper onto my 205.

by **RedMist** » Wed Mar 28, 2007 3:24 pm

big_boy wrote:also are you resturcted to a slider because i know of 2 good posablitys if you can use 2 pot solids

I had thought that a 2 pot slider would give you more pad surface. Am I incorrect?

by **fivebob** » Wed Mar 28, 2007 3:43 pm

A slider should give you more pad area, but probably less piston area.

Biggest piston 2 pot sliders that I know of would be '92+ SW20, or ST215. Earlier model SW20, and probably ST185's have slightly smaller pistons.

by **sergei** » Wed Mar 28, 2007 3:45 pm

The ST185 is exactly the same as ST165. twin pots or single.
Twin pots a fitted to 254mm rotors, while single is fitted to either 254mm (ST165) or 277mm (ST185). Single pot from ST165 is exactly the same as single from 185, only difference are the brackets.
As far as I am aware you cannot fit twin pots to 277mm rotor without modifications. The ST185/165 have 54mm spigot while ST205 have 55mm (from memory), also ST205 have completely different mounting position for callipers (they don't come with brackets), ST205 rotors also have different "offset".

by **sergei** » Wed Mar 28, 2007 3:46 pm

fivebob wrote:A slider should give you more pad area, but probably less piston area.

Biggest piston 2 pot sliders that I know of would be '92+ SW20, or ST215. Earlier model SW20, and probably ST185's have slightly smaller pistons.

What about Altezza's (RS200) they use twin pot sliders and look pretty big to me.

by **fivebob** » Wed Mar 28, 2007 4:04 pm

sergei wrote:
fivebob wrote:A slider should give you more pad area, but probably less piston area.

Biggest piston 2 pot sliders that I know of would be '92+ SW20, or ST215. Earlier model SW20, and probably ST185's have slightly smaller pistons.

What about Altezza's (RS200) they use twin pot sliders and look pretty big to me.

The 15" wheel ones are the same pad size as the non-superstrut ST202, the 16" ones are the same as the JZA80, but you might have problems fitting those under a 15" rim

by **RedMist** » Wed Mar 28, 2007 4:33 pm

The superstrut suspension is gone. As such the hubs, arms and struts are (or will be very shortly) from the ST206. Arms fit at the very least.

Sorry my stupidity, Brain fade day. Calipers and disks from the ST206 are tiny.

by **groupagt4** » Wed Mar 28, 2007 5:19 pm

st185 spec A has twin pots ans bigger discs i thnk

by **sergei** » Wed Mar 28, 2007 8:10 pm

groupagt4 wrote:st185 spec A has twin pots ans bigger discs i thnk

I have done research on that subject and I can tell there are only 2 types of brakes on ST185:
Big rotors and single pot.
Small rotors and twin pot.

by **strx7** » Wed Mar 28, 2007 9:22 pm

according to the DBA book, The group A or some other specced up one had 280mm discs on the ST185. the run of the mill with twin pots run 275mm.

by **groupagt4** » Thu Mar 29, 2007 6:23 pm

pretty sure the Spec A had bigger rotors and definately twin pots.ill check my repair manual might say in there

by **sergei** » Thu Mar 29, 2007 6:38 pm

As far as I know facelift and widebody came with big single, others came with twin smaller.
BDA book is sometimes innacurate. As well as other aftermarket parts books.
(listing wrong rotors and pads for my ST165).

by **johntramp** » Thu Mar 29, 2007 9:46 pm

some legacys come out with 2pots with the same size rotor as the nissan / subaru 4pots

by **groupagt4** » Sat Mar 31, 2007 6:19 pm

yea gt 4 A is 280mm with twin pots

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