Patent ID: 7690735

Claim:
An integrated parking and service work brake arrangement, comprising: a housing; a first valve within the housing, the first valve adapted to open upon receiving an electrical signal, the first valve further adapted to deliver a first pneumatic control signal when open; a fourth valve within the housing, the fourth valve adapted to open upon receiving an electrical signal, the fourth valve further adapted to deliver a second pneumatic control signal when open; a third valve within the housing, the third valve adapted to open upon receiving an electrical signal, the third valve is further adapted to deliver a third pneumatic control signal when open; a second valve within the housing, the second valve in communication with the first valve and the fourth valve, the second valve adapted to open upon receiving the first pneumatic control signal and close upon receiving the second pneumatic control signal, wherein the second valve delivers pressurized air for applying a service brake assembly on the vehicle when open; and a fifth valve within the housing, the fifth valve in communication with the fourth valve and the third valve, the fifth valve adapted to open upon receiving the second pneumatic control signal and close upon receiving the third pneumatic control signal; wherein the fifth valve delivers pressurized air for releasing a spring brake assembly on the vehicle when open; wherein the second valve and the fifth valve will close when a pneumatic pressure of the pressurized air is lower than a predetermined value.