Hi guys I have a vx ss commodore my brake fluid is just fraction under full mark on the reservoir but when i take car for a drive fluid seems to come out the top near the seal not a lot but still leaking. I tried taking some out to around the half way mark and it dont leak. Is this to low for my fluid level or should I just buy new top and seal. Checked my old and one seems ok and everything else is brakes etc is ok thanks