master cylinder upgrade ?

[filh]

I know it has often been discussed , but can't find a clear answer .
I've fitted the front FC Mazda 4 pots caliper , but found the brake master cylinder weak: good bleeding but a very long pedal stroke .

I did search on forums and saw many solutions for upgrading the BMC.But most are for right hand drive .
I'd like to find a solution for a left hand drive (ae86 of course), with a two bolts BMC. Stock is 13/16, and I'd like to find a 1" .

I'd like to avoid the abs BMC . And finally a easy to find part.

Saw the supra MKIV , but it's so uncommon here in Belgium !
There's also the Camry late generation, but i'm not sure about fitting holes compatibility.And may be mods to be done about ABS?
I guess I'm asking much , but who knows?
Thanks for your help
PHIL

[Ivan141]

There was some talk about using AE82 master cylinders a few years ago, supposedly those have a bigger inner diameter too. Dont know if it will fit the 2-bolt or 4-bolt version though.

[filh]

thxs but I found infos about AE82 , and the cylinder bore size is 22,2mm.
I don't think it's bigger than the AE86.
I'm more after 1" dia .
Pretty hard to get a reliable info
Thanks anyway
Phil

[filh]

can anybody confirm that a celica st202(2l 3sge) or at200(1,8l 7 age) (year 94-99) would fit .I think it's 15/16"
thxs
phil

[jondee86]

In Australia the Mitsubishi Starion 15/16" master cyclinder is said to
be an easy bolt on upgrade... but I don't have any specs on the chassis
code or part number.

Cheers... jondee86

[S.K.]

Latest AE92 GT-i (small port 4A-GE and 258mm front brakes) have a 25mm brake master cylinder, but it have 3 bolts...

[Ivan141]

The AE82 master cylinders are 7/8" as opposed to the ae86's 13/16" diameter.
It's not much, but it's almost an 8% increase in diameter.
Have you measured the difference in fluid capacity between the OEM and RX7 calipers?

[filh]

Thanks S.K. , but it's so hard to have the brake booster removed . Specially , with the roll cage and lateral cross ....
That's why I prefer to keep the stock 2 nuts Booster .

To Jondee , Yes , it's correct , but pretty hard to find , as It's getting old and uncommon here .
Here's a link to an online shop with parts size and pics . I often use it to compare parts
http://login.mongrossiste.eu/mglive/cata...wjaar.aspx it's in french but easy understanding .
To Ivan : No didn't measure the difference between both caliper , but I'm sure I need a bigger BMC . I read lots of topics and same conclusion the stock 13/16" is not giving enough fluid . I could sse it when bleeding , not much brake fluid coming out bleeders .

I think I need a 15/16" or 1" BMC .

The brake pedal is very soft ( and I'm sure of bleeding) . 2 reasons :
1° BMC is to weak to supply enough brake fluid to calipers .
2° the rear brake calipers are bad .
The floating caliper is guided on rubber , and even with new ones , it's not well guided (lot of clearance)
Just make the experience . Ask a friend to press brake pedal while you're looking at rear brake calipers .
You'll see that the first caliper action is to get in place , before piston apply power to pad . That's thre reason why stroke brake pedal is so long .
Regards to all
Phil

[mc68]

r32 gtst non ABS master fits fine, and does the job well

[Ivan141]

r32's are even harde to find here than supra's.
I believe old cressida's do have 15/16" master cylinders..perhaps that will help. Otherwise you can always try a used ae82 master cylinder and see what that does.

Did you know you can buy springs to keep the brake pistons from getting pressed back due to disc deflection?