Ok i've got a 92 c2500 5.7, i have replaced the front calipers, pads, rotors and bearings, it has been going nice for about 5-6 months now, now all of a sudden when i go to apply the breaks the front end of my truck starts to bounce up and down, checked the fluids everything is new in the front breaking system, also have noticed it has started to pull to the left when i apply the breaks tho only for a couple seconds then it lets up but the front end still bounces, any input would be great.

 

Sometime rotors from China will do this. Recheck everything.