I have a 1986 560SL. Brakes have begun to squeal recently. I was shocked at quotes for brake jobs. Are the pads something I can replace myself? Also - I notice on searching the net that pads alone are not listed, but only caliper assemblies. Can pads alone be replaced? I've done many brake jobs on Fords, Toyota's, Subaru's etc, but never a Benz. Appreciate any help I can get. Thanks!