Pressurizing piston unit, design - GF42.45-P-4200-02A
There are two separate pressurizing pistons (b) which are held in their normal position by the springs (d) in the cylinder housing (a) of the pressurizing piston unit. When the pressurizing piston is in this position, the central valves (c) of both control circuits located at the end face are opened.
The ESP brake pressure sensor (B34) is attached to the pressure chamber for the front axle circuit.