But your connecting to seperate systems together when they meet at the t piece for the brake bias.
The standard bias keeps the two systems seperate. I.E you have a 4 port M/C. This has two sepratly filled and sealed systems. The back system that feeds the back two ports and the front system that feeds the front two ports.
On standard oem system, one back port would feed one front wheel and the other port will feed the back opposite wheel eg, left hand port of the back group will feed the front right brake, and the right hand port will feed the back left brake. that systems runs fully independant to the front port systems.
Where swampy fails in his statement is that, he is saying use one port of one system to feed the in car brake bias valve and the other port of same system to feed a front left brake.
On the front system one port feeds the front right brake and the other port is linked to the brake bias valve.
That means if one line breaks you will lose all brakes.
If you have the back system only providing the back of the car and the front system providing the front then if one system faisl, you will still have one axle braked.
swampy your system using an adjustable in car brake bias will cause all brakes to fail even if one pipe is leaking.
On the front system one port is feeding the front
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