I received following advise from Thomas to remedy the 737NG1051 file for hardware parking brake problems.
It goes without saying that you first backup the file you are now using if you made changes.
quote
The best way is to find this part in the.lgc file
//Hyd-Accumulator for Brakes
if (pmhyd1 > max) and (pmhyd2 > max) then brakefail = 0
if brakeaccu < pmhyd2 then BrakeAccu = BrakeAccu + 50
endif
if brakefail
if brakeaccu > 1000
if ((lbrake > 10000) or (rbrake > 10000)) and (prkset = 0)
brakeaccu = brakeaccu - 10
endif
if Parkbrk and (prkset = 0)
brakeaccu = brakeaccu - 900
fsprkbrake = 32767
prkset = 1
endif
else
lbrake = 0
rbrake = 0
endif7
else
if parkbrk
fsprkbrake = 32767
prkset = 1
endif
endif
if (Parkbrk = 0) or (prkset = 0)
fsprkbrake = 0
prkset = 0
endif
-----------------
and delete this complete part.
Then there are no changes to do in your hardware setup.
The Parkbrake will then work.
unquote
Success.
Itworked fine for me.