KE10 Master Cylinder Bore Size

[Darrensan]

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

[altezzaclub]

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??