The wear properties of low modulus polymer-based friction materials were studied. The wear equation W = K P-a V-b t(c) was used to correlate the wear of polymer-based friction material sliding against cast iron with the wear coefficient (K), load (P), speed (V), and time (t). The parameters were determined experimentally by varying only one variable at a time and keeping the other two variables constant. The wear rate of selected polymer-based friction material was compared with cast iron friction material. (C) 2005 Wiley Periodicals, Inc.