the clutch master cylinder which i had replaced last October (7 months and 7000km ago) has failed again!!

i realize it was just a replacement part. the previous (replacement) lasted a bit over a year which is slightly more acceptable. i'm not really in the mood to put in an original kasi ginto yun (5000+ price). oh well.. is this the price to pay for using replacements? my water pump is a replacement too (GMB) but it's been a year so far and no problems.