Uneven wear of braking surfaces. Blue spots in the center of braking surface. Possible appearance of cracks

Incorrect assembly of the caliper and/or pads can result in the pads being at differing angles to the disc, each side wearing at altered rates. The blue spots are generated by severe localised overheating where the friction contact occurs

Gradual onset of vibrations, due to heat spots. Probable reduction of brake effciency

Check and, if necessary, repair the caliper. Replace pads, checking type and shape are correct for application