Hydraulic brake booster. 1 - brake system reservoir, 2 - return hose, 3 - inlet tube (from the power steering pump), 4 - hydraulic brake booster, 5 - power steering tube/hose, 6 - steering gear, 7 - power steering fluid cooler, 8 - power steering pump.
Of course, it should be understood that control systems and their algorithms have changed over time to more modern ones, but the set of systems themselves has remained the same: ABS (anti-lock braking system), system of electronic redistribution of brake forces (EBD or DRP), traction control (TCS), stability control system (VSES). The only thing on the new models is the system of redistribution of brake forces (EBD) instead of the system of redistribution of brake forces on the rear axle (DRP).
The changes mainly concern the control system itself rather than changes in structural elements.