2010 HHR ABS Traction control lights
 

My 2010 HHR Traction control and ABS lights come on after going over a speed bump and then will go off after 15 min of driving. Another weird thing is 2 times a day when pressing on the break peddle the break seams to grind for about 2 sec and stops then another week later it will do it again. I have replaced the pads and rotors on all 4 tires. this is only happening on the front wheel. there is no pulling or grabbing just a grinding sound for a couple of second. Any Help will be appreciated.