Should I be worried or is this a normal thing for discs?
Doesn't sound good. Inspect caliper / pads / rotor for damage. Check arm actuation for stickiness / knotchyness. If grindy remove pads and flush mechanism with GT40.
@Howard started
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Doesn't sound good. Inspect caliper / pads / rotor for damage. Check arm actuation for stickiness / knotchyness. If grindy remove pads and flush mechanism with GT40.