If you have the burning smell of brake pads coming from the wheel,
it's likely the caliper has failed and the piston is sticking. Time
to pull the wheel and find out for sure. Solution is likely a rebuilt
caliper and new rotor or having the existing one turned down if it
will still be within wear limits.
Just looked at the pics, and why is one wheel all wet at the bottom?
Is that just water, or is it brake fluid? If it's brake fluid, I
wouldn't drive the car until it's fixed and even if it's just
generating a burning smell, I would only drive it a few miles, slowly
to get it fixed.
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