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.
Total Cost - $64.00 for the pads (front) - $10.00 to resurface the rotors - $8.50 for the brake hardware kit. Total = $ 82.50. You could get it done for less than that - (I've seen as low as $49.99 - but most of the places will use really inferior pads etc.