Vehicle brake system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 1, 1991
Grant Date -
N/A
app pub date -
May 29, 1990
filing date -
May 29, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A brake system for a vehicle includes a pump coupled to a service brake through a brake pedal valve and to a parking brake by a four-way solenoid valve which also couples the pump to a transmission disconnect valve. Activation of the solenoid valve couples the parking brake to the pump for placing the parking brake in an off mode and actuates the transmission disconnect valve to couple a transmission pump to a transmission valve. Deactivation of the solenoid valve disconnects the parking brake and operates the transmission disconnect valve to disconnect the transmission so that the vehicle cannot be driven when the parking brake is on. A check valve connects the parking brake to the brake pedal valve so that the service brake can be operated when the pump is deactivated.
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