These pictures are examples of why here at JTS autocare we only use OEM parts along with sugesting servicing when its due to the vehicle 

brake disk scored
brake disk scored

this can be caused by useing cheaper non OEM spec equipment

brake disk overskimmed
brake disk overskimmed

this disk was overkimmed so when heat built from friction it cracked the disk

pad down to metal
pad down to metal

this was caused by sharply breaking whilst carrying too much weight

brake disk in 2
brake disk in 2

this is another example of non OEM items failing

shock absorber
shock absorber

was driven like this as owner thought they had a broken spring