Ive always had this issue and was wondering if there was a factory tsb related to it. My car is a non abs car, any kind panic or unplanned hard braking the rears lock up but not the fronts. It's bad to the point its like pulling the ebrake and im going sideways at 55 mph. I can never fully utitlize the fronts because the rears are already sliding. Had different pads over the years and brakes are bleed. It feels like its a bias issue or weigh transfer issue. Any thoughts?