Brake squeal

[Marcozi]

My car's left front brake has been squealing at low speeds. Yesterday, I removed the PF-08 pads and reinstalled the factory Brembo pads. The squeal is still there, The pads I removed seems to have not issues as far as the remaining pad material. Suggestions?

 

[Propflux01]

Caliper sticking.

 

[GMBoy]

Pull the caliper slide pins, clean and relube with proper brake grease. Then clean the rotor, caliper and brackets well with brake cleaner. Check that the pad hardware isn't rubbing on the rotor. Then apply lube to the caliper piston and other side where back of brake pad touches. Reinstall the pads with lube on the ears and edges as necessary. Take a drive and bed the brakes in (2 or 3 medium-hard stops from about 40-50mph to 5mph (don't come to a complete stop). See if that helps.

 

[Marcozi]

GM, these brakes are 4 piston caliper where the pads are held in place by 2 pins and a rattle clip. Thanks for your help!