It sounds like the left front caliper is not doing it's thing.
Time to do brake maintance. I'd do new calipers and pads. Check the discs to see it there are damaged, if they are, do them also.
I know that post seems kinda parts intense, but the parts are reasonably cheap and it all gets done the 1st time. My expereince with calipers is that if one is causing issues, it will not be too long until the other one does also.
I am of course, "ass-u-me-ing" that this is an OEM issue, and you didn't just Mod your brakes. If you moded them, the cause is the same, but the solution may be different.