The F18 Hornet Landing Panel & Light Brake standalones have a new firmware update available, to overcome the issues with the park brake. this is compatible with any units shipped prior to the 01/01/22, any shipped after this already have this applied.
A copy of the firmware is here, https://1drv.ms/u/s!AtANFY-RIM2Oi6lmR_Gd5w0He_lFkA?e=lY42EZinstrucstions
And the Instructions are here https://tekcreations.space/how-to-reflash-firmware/
I have made a change for the unit now to sort out the park brake issue. With this firmware, even when in dcsbios mode, The Park Brake is in HID mode and needs manual mapping to function
For mapping see screenshot below in controls, this is how it needs to be mapped, the rest of the controls work in DCSBIOS mode still. Once park brake is rotated and pulled, to release turn right first then push in and it should release.