Master cylinder pressure question..
 

Other discussion about MC's and the mention of a MC with 60/40 bias.
Someone explain to me how the MC can have 60/40 bias when the bore in the MC is the same size for both pistons/ports.
I know GM used some step bore MC's where the pistons are different sizes for each port which makes sense using hydraulic principles where the same pressure is applied to 2 different size pistons results in different pressure out of the ports.

Re: Master cylinder pressure question..
 

The positioning of the "cups" are staggered, which changes the timing of the application of pressure

Re: Master cylinder pressure question..
 

Might delay application but it sounds like many think the pressures are different, including the tech guy at the company that sells them.

Re: Master cylinder pressure question..
 

They will be different, due to the compression on one side versus the other - start compressing later would result in lower pressure.

Re: Master cylinder pressure question..
 

Pressure can only be increased by changing the pedal ratio or by decreasing the master cylinder bore.

Re: Master cylinder pressure question..
 

The bias is likely volume not pressure.

Re: Master cylinder pressure question..
 

How does it put more volume to one port? Same bore size operated by the same pedal stroke.

Re: Master cylinder pressure question..
 

The piston is elongated with a chamber in the middle section. The forward chamber is pressurized by the front of the piston, full bore diameter.

The middle chamber is also pressurized but has reduced area due to the middle diameter of the piston carrying across to the forward piston. At any given pedal force, reduced pressure is generated in the rear chamber.