 The braking rheostat is placed on the roof, between the pantographs.The air brake employs a mixed shoes-disc system (one shoe per wheel and one disc per axle), due to space issues about the motor placement; also, E.632 have brake cylinders, while E.633 .The chopper regulation and the rheostatic braking allow the driver to set an automatic speed control; the locomotive will try to keep the set speed by electrically braking or by tractioning if needed.