Originally Posted by
Luckylegs
... I'm going to be captain obvious and say that I presume this means at a very basic level there's air in the system and that furthermore given one rotor is getting warmer (but not considerably hot) than the other that the air is sitting somewhere between the good (right side) calliper and the pistons in the left.
Captain Obvious might dictate ... that if the master cylinder was the issue ... both calipers would have issues. Hydraulic lines should produce equal pressure on the piston(s) of both calipers, regardless of actual length and layout of the lines. Thus I don't believe air is the issue.
Look more toward the possible issues regarding the seating of the disc pad. Pull out and check for even wear. A bit of grit in the fluids may have caused the piston(s) to stick ... a known issue in the past.
You or someone you trust could pull the caliper off and check/clean the piston(s) and seals. How many pistons in each caliper on your bike .. ???
When life throws you a curve ... Lean into it ...
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