Hi All,

Whats the factory master cylinder bore size on a 69 KE10?

I'm converting my 10 to four wheel discs with a dual diaphragm booster. 

I would just like to know which bore size master cylinder would be best to buy?

Cheers

That depends on the caliper piston sizes.  Find the area of front & rear caliper pistons, add them up, assume a cylinder of that area by 1mm and that is the volume of brake fluid you have to move. You only want the master cyl to move 5mm to do that, with a ratio of pedal between your foot and the m'cyl your foot will move four or five times as far.

I expect you'll be looking at a 3/4" to 15/16th master cyl diameter.

What size front discs are you looking at?? 270s?? 290s?   ..or what motor are you using and is it street or competition use??

Thanks for the reply altezza. 

My KE10 is for street.

I'm running a 7ke turbo. Car is not on road yet, still have to get rear end sorted but will have shortened hilux diff and whatever discs I can get on them. However, front discs a from a KE55. 

Area of front and rear calipers?? I'm not real good with maths.lol.

I was looking at buying a Wilwood master with a 7/8 bore.

Will this suffice?

 

KE10 is 11/16’s.

AE86 is 13/16’s boosted and runs 4 wheel discs, and pulls up on a pin stock standard with a 4AGE. 

Well, the smaller the master cylinder, the further the pedal moves to brake, and the more leverage it has on the pads, so its easier to push.

The larger the m'cyl the less it moves and the harder it is to push.

An AE95 has a 14/16th" or 22mm master cyl.  that's pretty much an average number.

What bolt holes do you have in the booster for the KE10? That's another factor to sort out.

Thank Parrot, ill look at a 13/16 sized master, cheers.

Thanks for the info Altezza. I'm running a remote cylinder style booster which will be under the dash. Ive got no more room in the engine bay.