How do I fix sqeaky brakes and a low speed
When brakes get hot they squeal at a slight touch of the brake pedal, not with hard braking
Inspect the pads and rotors for abnormal wear. Take the pads out of the caliper and clean everything up and relube the caliper pins and contact points, and reinstall.
I would change the pads to a more expensive, better material- usually, squealing is because the pad composition is too hard- get something nice from an Alfa specialist