Larry, I replaced 1 of the 2 front since it broke during the replacement. The other 3 have not been done but I don't believe that is the issue since the brake fluid streams out on bleeding very well. Do you know how to check the booster or convergence valve ( prior to ABS) it is suppose to balance pressure. The master brake cylinder sends a front and back line to the convergence valve and then from their it sends out the pressure to each brake. Thanks Thomas