A lot of squeaky disc brakes are from the brake caliper piston rubbing the backside of the brake pad. The standard pads use a shim between the pad and the caliper piston, suppesed to stop the sqeaking/sqealing. Aftermarket pads often don´t use a any shims. A bit more prone to sqeaking. You can get a paste for your brakes to stop it. Wurth makes one.