Reply To: front brake master cylinder testing

[dougyt]

The pressure is not the important factor, it’s the volume of fluid moved. At its simplest terms, With an extra calliper to move you will need a master cylinder which will move more fluid or your lever is going to move a long way to move the callipers enought to apply the pads.
In a more technical answer, you will need to know the size of the pistons in the callipers, and the size of the piston in the master cylinder to work out a ratio.
Here is a site with a little in depth detail about brake ratios http://www.vintagebrake.com/mastercylinder.htm