In addition to these signals there is an electrical kick down solenoid valve that if engaged allows the transmission input speed to get to maximum permited RPM before up changing, this is operated by a switch/relay which closes when the throttle pedal is fully depressed. lots of vac = light load so if the speed is sufficient change up,and low vac = heavy load so stay in low gear or change down.Ī cable from the throttle is also connected to the valve block to give a demand signal to the box. The transmission vacuum system comes from the inlet manifold (petrol) and is used as load sensing signal, i.e. The locks are blown on and sucked off so to speak by an electrical pump. The pneumatic locking system is totaly independent of the engine vacuum system.
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