Twin Pot Calipers

[elbon50]

Have purchased a pair of twin pots & carriers from a 1991 (pre facelift) ST185

Havn't arrived yet

[boondougal]

If your were to upgrade the front brakes with st 165 / 185
could your original vented fronts be fitted to the rear or would you also have to buy and fit all four from a st165 / 185?

the standard mk1b discs work with the st165 twin pots

[boondougal]

Have purchased a pair of twin pots & carriers from a 1991 (pre facelift) ST185

Havn't arrived yet

Are you up rating the rears?

[MartG]

Have purchased a pair of twin pots & carriers from a 1991 (pre facelift) ST185

Havn't arrived yet

Are you up rating the rears?

Gutting the bias valve will keep the front/rear brake balance near standard with the twin pot fronts on

[elbon50]

Have purchased a pair of twin pots & carriers from a 1991 (pre facelift) ST185

Havn't arrived yet

Are you up rating the rears?

Gutting the bias valve will keep the front/rear brake balance near standard with the twin pot fronts on

Gutted the bias valve last year

It helped avoid lockup with stock brakes

So may need to uprate the rears when I put the twinpots on

[SuperRedMR2]

Are you up rating the rears?

Gutting the bias valve will keep the front/rear brake balance near standard with the twin pot fronts on

Gutted the bias valve last year

It helped avoid lockup with stock brakes

So may need to uprate the rears when I put the twinpots on

I'll let you know how I get on after the end of the month when the engine goes in.

[elbon50]

Received the twinpots today

They seem OK

Will refurb them first

[SuperRedMR2]

How much were they if you don't mind me asking?

[stenky]

where are you getting the refurb sets from?

[elbon50]

How much were they if you don't mind me asking?

30 quids each Alex

How does that compare with yours

[SuperRedMR2]

I bought one for £60 fully refurbed including postage and another pair for £50 plus £30 refurb kit - but I didn't have to buy replacement discs which you will be doing.

[elbon50]

I didn't have to buy replacement discs which you will be doing.

Why do I need replacement discs Alex ?

[SuperRedMR2]

I didn't have to buy replacement discs which you will be doing.

Why do I need replacement discs Alex ?

Do the 185 calipers work with standard mk1 discs?

[elbon50]

I didn't have to buy replacement discs which you will be doing.

Why do I need replacement discs Alex ?

Do the 185 calipers work with standard mk1 discs?

Hmmm, good point Alex, am not sure yet

Early 185 was said to have same brakes as 165

165 had 256 mill discs

Later 185 with big single pots had 277 mill

Don't have any info re disc size on early 185s at the mo

[SuperRedMR2]

You might get lucky

http://www.fasterthanjesus.net/technical/awbrakes.html

But remember you'll have to buy non-mr2 pads

[elbon50]

You might get lucky

http://www.fasterthanjesus.net/technical/awbrakes.html

But remember you'll have to buy non-mr2 pads

Good, thanks for that Alex, seems that Mk1b discs will be OK

Yes, I'll probably use Scooby pads like yours

[SuperRedMR2]

Have you got a bench grinder?

A file may work but will take ages

[MartG]

Did mine with an angle grinder ( aka a Twobrutal spanner )

[elbon50]

Have you got a bench grinder?

A file may work but will take ages

Yep, have a bench grinder

[rexer200]

Paul would be the best person to ask, I didn't think the 185s were a direct bolt on.

Well he could ask the man that invented the mod, but will he listen?

Just to clear this up, you can bolt ANY of the Celica calipers to a Mk1 hub, be it Mk1a or Mk1b, all Celica caliper bolt spacings are the same as Mk1.

Where the confusion starts is folks try to bolt the caliper part to the Mk1 slider bracket, which doesn't work.

You need to buy the complete Celica caliper, bracket as well, and it will bolt sraight on to your Mk1 hub.

Now if you got the caliper from a 256mm disc'd Celica then they will plug and play onto a stock Mk1b disc, if you're doing this to a Mk1a then buy Mk1b discs. Some St185 Celicas had a 277mm disc, in which case you buy the Celica 277mm disc as well and drill 3 holes in its face (one of the 5 stud Celica holes is already in the right place. Don't worry about the holes not being exactly right, luckily the Celica discs share the same centre spigot as a Mk1 too (almost as if they had planned it) so it will remain hubcentric regardless of being a few mm out on the stud holes.

Which Celicas had 256mm and which had 277mm i've never taken the time to study, i just know when i first discovered the upgrade that they all worked.

The monster st205 4 pots again bolt up, but need the Mk1 hub holes tapping out to take a bolt and a 2mm washer placing between caliper and hub to retain the correct spacing. You will need to do a fair bit of machine work to the St205 discs to get them working, Spigiots needed and a reduction in diameter too, but they will endo your Mk1 i kid you not, to date the best brakes i've ever had on a Mk1, they do have a tendancy to squeal though, a common complaint from Gt4 owners.

Hope that helps.

Paul - I've read loads of posts but still can't find the answer. Can you just clarify one more point. Do you know if there is any off the shelf Toyota caliper carrier that allows you to use the ST165 twin pots with the 277mm discs?