I wish I had a 4 wheeler but really don't need one.
Sounds like you need a spring to hold that pawl or ratchet part against the teeth.
If you decide to go with that microswitch, you can also wire it so that the lamp is on (lit) and the ignition is disabled until you release the brake.
Well we certainly don't want that "horse" to run off and leave you stranded on those 43 acres. Got to have that parking brake working.
