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© 200436 2-25 Description of components OPERATION OF BRAKE COMPONENTS ΛΦ45/55 series 6 3 PARKING BRAKE VALVE WITHOUT TRAILER operation of the parking brake system of the prime mover. Operation - driving - parking Driving through-connection of the supply pressure (connecting point 1) to connecting point 2 for the spring brake cylinders. The bleed vent is now closed. The output pressure at connecting point 2 is now approx. 8 bar (see graph). Emergency braking the spring pressure, tappet 3 will move downwards via the eccentric (2). The space at connecting point 21 can now be bled and as a result the pressure at connecting point 21 will drop. Spring 4 forces piston 5 down until valve 6 comes into contact with the seal collar of tappet 3. A state of equilibrium has now been achieved. When the handle is moved against stop 7, the bleed vent will remain open so that the spring brakes are applied to maximum effect (max. emergency brake position). R600400 2 7 3 4 5 6 1 3 2 1 2 |