master cylinder upgrade ?

[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