Abstract: An integrated battery tray and reservoir assembly 10 is provided which is adapted to be operatively installed within the engine compartment of a conventional vehicle. Assembly 10 includes a battery tray portion 12 having a back wall 14 which includes a generally rectangular cavity 16; a vacuum reservoir plate 18 which is sealingly attached to back wall 14 and which cooperates with back wall 14 and cavity 16 to form a sealed vacuum reservoir 20; a valve housing portion 22 which fluidly communicates with reservoir 20; a solenoid valve assembly 24; and a check valve assembly 26. A vacuum hub locks pulse supply line 30 is coupled to valve 24 and selectively receives vacuum pulses from valve 24. Assembly 10 further includes an engine vacuum line 32 and an HVAC vacuum line 28 which are fluidly coupled to vacuum reservoir 20 and which respectively provide and receive vacuum pressure to/from reservoir 20.