Good thought but I just wonder how would air get in the brake lines if the brake system has not been touched, unless there is a seal that was comprimised but would you not have fluid leakoing somewhere if that was the case?

Or are you suggesting the fluid is bad or someting? First thing I did was check the resivoir and the fluid level is good and fluid is clear nice golden colour. No fluid leak anywhere I can see & all seals see look good?