The cellular determinants of K+ secretion in the principal cell include the intracellular K+ concentration, the luminal K+ concentration, the potential (voltage) difference across the luminal membrane, and the permeability of the luminal membrane for K+.
The average cost for a brake pad replacement, resurface rotors is between $254 to $361. Labor costs are estimated between $182 to $231 while parts are priced between $72 to $130.
As a rough guide, rotors should cost about $75 apiece, front pads about $110, rear pads about $60, labor to replace pads about 1 hour per SET of two wheels (a bit more for the back, 1.2) and each rotor removed takes about .2 of an hour. Sooooo, front and back brake job with new rotors would be about what he said.