brake is placed hard in Peugeot Partner driving

Hello, when the pedal gets hard, it is because the servo is not working, perhaps it has little empty, it can be if the depressing pump is oil, some vehicles carry it behind the alternator but it seems to me that the Peugeot takes it below the camshaft and is lubricated with oil and if it is a beancer (naphtha) check the void from the multiple of admission to the servo, I hope it helps you to help you