Hello! Recently I noticed that the brakes can only be used in a limited way after some operation with the engine switched off (but the ignition is switched on). The pedal becomes hard and with a lot of power the braking effect is quite low (that is even less than before in the cars without brake power amplifier). I thought that all support systems (such as the power steering) work electrically in the Aygo. Is the brake hydraulic now and the residual pressure is not When the engine is briefly started, the brake is back to normal. The hand brake is not affected by the problem.