My old memory says check the simple stuff .. connectors loose ? under rear seat corners and front chassis legs tops is there locations ....


Waggle test .. to check for them at the fail limit on connectors ... from memory they should resistance check .8 ohm to 1.4ohm as a running range


Fluid level just wrong ( Pump brake pedal 30 times to de-pressurise- ign off , switch ign on system let system it pressure up =True level) or fluid boiling losing brake losing pressure


Warped discs all, cv joints funky on front 4x4 ... all sensor heads clean ? no rust sticking to them, pick up rings corroded .. remove sensors carefully they snap at the hubs


Goodluck


Typing fast as off out