Graham:
The symptom you describe is likely caused by a bad flex-brake hose. The
interior of flexible rubber hose that connects to the caliper has likely
deteriorated. What happens is when you engage the brakes you pressurize the
hose and force fluid into the caliper. When you release the brakes you
depressurize the hose and it collapses. The calipers do NOT generate enough
force to expand the hose so they remain partially engaged and the pad-drag
quickly builds up heat.
I suggest you also check the caliper itself to ensure the pucks are moving
freely. Do this by releasing the bleed screw and prying the pucks apart from
the disk. They should move without too much difficulty.
When you have completed the inspection and repair of the brake hose /
caliper, be sure to turn the rotor and replace the front pads on both sides.
Best,
Wayne
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