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The pressure differential valve has two chambers (to which the hydraulic lines attach) with a piston between them.
From the pressure differential valve, brake tubing carries the pressure to the brake units at the wheels.
The fluid pressure from the master cylinder travels through a pair of steel brake tubes to a pressure differential valve, sometimes referred to as a "brake failure valve", which performs two functions: it equalizes pressure between the two systems, and it provides a warning if one system loses pressure.