All the faults you report are likely causes of your problem. A straight out overhaul may surprise you.
A hand/visual check by twisting/wobbling the wheels with the wheel clear of the ground, should show up any end play which could be causing a problem. The fault I described usually manifests in a longer than normal peddle travel, as is required to take up excessive clearance existing between the pad/rotor.
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Trevor, New Zealand.
As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit!
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