if i use them the way u normally use ur brakes they lock on me. i have 2 slow down way b4 a turn or light & come 2 a rolling stop. if ive used em 2 much i can feel it about 2 happen. the pedal gets really stiff & barely goes down at all when i press it. when it happens the car hardly moves at all even if i have the gas 2 the floor & eventually wont move at all. i have 2 wait about 30 mins 4 them 2 unlock. i had the brakes changed a cpl wks ago & everything was fine 4 about a wk now its even worse than b4.