Been having a nightmare with brake drag this weekend. Cleaned sliders, changed hose. At the moment it looks like the internal piston seal has swollen in the caliper that was dragging.
I swopped the pistons and seals over from passenger to drivers and vice versa to see if the problem also moved. While doing this I compared the seals and one was definately larger. Doing some more research it could have been caused by the garage using coppergrease instead of silicone or red brake grease.
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