Jude098
Be prepared to be underwhelmed by the performance of the DR400-120, it is very short on power but the cruise speed is not bad.
The braking system depends on the age as toe brakes became standard in about 1985, a retrofit kit is also avalable for older aircraft.
The aircraft may have four seats but you can't fill then with adults, before putting anything in the back of a 120 take a sharp look at the W&B.
The optimum DR400 Is the 160 in terms of load/fuel burn/speed. The 180 offers better take off and climb performance, in the UK this is not too much of an issue but when you get into southern Europe and get hot and high the extra 20HP really shows.
Enjoy the 120 it is a much nicer aircraft to fly than the Cessna but the performance is more or less the same.