Nissan tiida

I have a 08 nissan tiida 1.5 disel for 3 years the clutch pedal has always been heavy to push down to to change gear but last year the slave clutch cylinder went in it I fitted a new one but the pedal was still hard to push down and about 3 months later it started leaking clutch fluid but not to bad and for the last few weeks I've had to top it up every day so I tuck it apart and the clutch slave cylinder had burst inside the bell housing I've ordered a new one from nissan and I'm going to collect it today but worried if I fit it with the heavy pedal issue still there that it won't last either dose anyone know what can be causing the heavy pedal issue please help