Brakes

Maybe a sticking caliper or pinched brake hose. I had this happen with a pinched brake hose. The little bracket on hose rusts and pinches hose shut.

Conditions that may cause your pads to wear out sooner than expected include:
* Hardware may be causing the pads to not move freely. This can cause premature wear as the pads may be in constant contact with the rotor. It could also be a malfunctioning caliper.
* Caliper slides that are binding or seized can cause this condition.
* Caliper slides should be removed cleaned and lubricated (and replaced if corroded).
* Installing new pads on an unfinished rotor will significantly decrease the life of the pads.
* Rear brakes that are not working efficiently will cause the front brakes to work harder, causing premature wear to the front pads and rotors.