@Chitownbusa1991
in general : at a bike (and at all vehicles too) left / right ALWAYS is thought and used in forward sight / in the direction of travel .
picturally said - i bet my entire garage
that your issue are clogged pistons in the (left) caliper
i found that damn bulls h it at a ´99 busa a year ago at both calipers
see
this page and its pictures
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my own experiences with dozens of the
tociko 6-piston calipers of the gen1 (´99-´07):
especially
these brake calipers must definitely be dismantled approx. every 30-35,000 km and deeply cleaned.
it doesn't matter which motorcycle the calipers come from, because suzuki or kawasaki have 100% exactly the same as standard. sometimes dark gray, sometimes gold - the color alone makes the difference.
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something about the brake pump:
as a rule, it is not to blame for blocking brakes.
the only thing that should be checked here also every 35,000 km, best while replacing the fluid every 2nd year, is the relief hole in the reservoir, hidden under the silver cap. (it must be bent aside for that and back after - otherwise you produce a kind of fountain in the reservoir when pulling the lever which then causes pollution around the outside - the DOT splashes out and soils the plastic)
this hole/drill must be absolutely free, because if it is clogged, the brake fluid can no longer flow back into the reservoir when the brake lever is released and the pressure in the system remains.
result - the brake becomes "hard" in the lever and then tends to lock (very similar to the above example).
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to the left disc :
such an overheated and almost burned out brake disc like the one on the left has to be replaced - there is no discussion possible.
and like with a car etc. too - both brake discs have to be replaced for each axle, so you shouldn't be stingy and invest in two new brake discs.
not to forget the brake pads - they also have to be replaced at both sides (together with the new discs)