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Originally Posted by tuanle16
the brake wear light still occasionally comes on. so how do i tell which brakes i need to change? again, visually, all 4 pads look "thick". any suggestions?
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Rule of thumb for me is to change the pad when the pad thickness =the metal backing thickness. If your pads look good inside and out you may just have a worn/failed sensor. Brake sensors get inserted into the pad and if they were reused after the last brake service you may have a bad one.
Pull the wheels, inspect the pads, inspect/replace the sensors if you intend to use them. No way to tell "which wheel" without a visual inspection that I am aware of. I don't use sensors so once I verified they were still good I zip tied them up and out of the way to facilitate fast pad changes. Now my sensors will never go off so I inspect my pads visually before and after each track day or at least once/month. I usually change rotors every other pad change. Put a mic on your rotors to measure runout and make sure you have enough left. Minimum runout is normally stamped on the rotor hat.
This DIY brake guide is pretty good:
http://www.pedrosgarage.com/Site_3/Replace_Brake_Pads_%26_Rotors.html