Most exhaust brakes are air applied and spring released. There no way you can move the actuator to the applied position by hand because you would have to overcome the spring, but it's too strong to be able to do that. My guess is the return spring is either frozen or broken since it will apply and not release.
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Bob Retired Army Traveling alone now, had to put Charlie the Beagle down :(.
2008 Camelot 40 PDQ 4 slides ISL400 towing a 2020 1500 GMC Sierra Denali 4x4 Crewcab
Western MT in summer, AZ, NV in winter
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