Hi, I am having brake trouble. My left front is locking up under hard braking causing the car to skid. I have had about 2000 miles of trouble free braking since rebuild of the brake system. When I did my brake job I replace the following” New slotted brake rotors. New Porterfield front pads. New front brake hoses. Rebuilt front calipers New non power M/C New rear drums New hardware kit. New Porterfield shoes New wheel cylinders. Thanks for your help. The car is a 72 Marverick Grabber Tony I