Meritor high/low splitter not working properly

After starting truck and building air pressure the splitter will not function unless you press on the brakes several times. When driving and going from low to high sometimes it engages but when trying to go fro high to low it will not engage unless i come to a complete stop and press on the brakes several times. We have replaced the neutral safety switch and the shifter knob. And the wiring harness is good. Any information will be helpful

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