I am getting squeaking sounds from the left front brakes,everytime I press the brake pedal,while driving?

I have replaced the brake pads,calliper and rotor. I also have used,brake grease on the pad slider clips and anti chatter compound on the back of the pads. All for nothing. The anti lock light comes on ,on the dash and so does the service traction system light.I,sometimes get a pulsating pedal when I ,apply the brakes too.