I have a 97 z28 and I noticed that my brakes work but if i slam the brake while moving, it locks up the wheels. I am a little worried about my ABS not working but i have new pads and rotors seem to be flat.

Does my car have 4 wheel abs or is it just two wheel abs (and is it front or back)? If its only 2 wheel then it is probably working just fine. The abs inop light is not coming on and my abs fuses are good.

BTW, im planning on flushing my brake system soon and was wondering if I need to do anything special for the abs system or just skip straight to bleeding the brakes?