yes,
bad master cylinder, ( it could be leaking at any well cylinder always look there first ,if dry then master cylinder)
in fact inspect every inch of line, as 4wd = off road and that means rock damage , to me.
if the front and rear brake pressure get out of balance , the
diff switch throws, this sets an coded alarm in the RWAL ecu.
it can be read out , with a jumper , all the codes spit out just like the CEL lamp will.
fix the brakes and you fix it , is my bet.
btw , bleading is normal with this syst.
except the extra step of bleading that extra unit next the the MC up front. but no specail tools needed.
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