I am fairly confident JL heavy-duty brakes fit JK. There is a YouTube video of JL HD brakes getting fitted to a JK. Here is the link
So HD brakes from JL should fit. This is a better upgrade than teraflex bbk as it uses Mopar parts and would be easy to source in Aus.
I want to know if JL or JT non-rubicon models delivered in Australia come with HD brakes as well.
I am thinking one could potentially just get away just using the JL calliper adapters and using the factory JK callipers then fitting a larger disk (JL disk). This should increase stopping power while keeping the factory brake system. This would be a cost-effective brake upgrade.
My understanding is all AUS delivered jks after 2012 came with a bigger brake master cylinder and all CRD jks came with a bigger master cylinder.