1969 Skylark, MBM disc conversion, done in 2015. Of late I'm getting a squeal on light and initial brake application. Its from the driver's side front,and only happens when the brakes are warm. Nothing when hot, nothing when cold. This morning, I noticed the squeal was there during a gentle RH turn, with no brake application. I pulled the calipers off, checked the pads, nothing obvious. I haven't checked the wheel bearing adjustment, that's Sunday's job. Any suggestions? Thanks, Chris