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trying to work out the plumbing for my brakes. i was going to go from my master to the booster then to a splitter with one going to my rear brakes and the other one to another splitter going to the front discs.. then my son said i only need to boost the front discs,he said i should------ go from my master to a splitter one going to rear brakes the other to the booster, then from there to a splitter to the front discs. i suppose it makes sense both ways,any opinions would be welcome.

Sounds right what he's saying, but my understanding is if you boost the whole system you need to change the rears slave cylinders to suit.

It all depends on what m/cylinder and booster you are using and if you have drum/drum or disc/drum/ or disc/disc.
For matching HR/torana discs and disc rear cylinders you boost the whole circuit, for drum front rear cylinders you only boost the front, discs or drums alround you boost the full circuit unless your m/cylinder doesnt work that way - does any of that make sense ?