Magazine for the auto service professional
Issue link: http://asp.epubxp.com/i/636156
35 | February 2016 In cases where pads have been allowed to wear dangerously thin, closely inspect the piston(s) and boots. If the pistons cannot freely run through the intended bore path, it's best to simply replace the caliper. Of course, rebuilding is often an option, but considering the relatively reasonable price of reman calipers as opposed to the labor involved in rebuilding in-shop, replacing the calipers is usually the best route both in terms of expense and shop time. Before rebuilding or installing new or reman calipers, always check the bleed valve frst, to verify that it threads easily. You want to avoid going through the time involved in caliper and pad installation only to fnd out that you have a problem with the bleed valve as you begin to bleed the system. Also, check the hex size of all bleeder valves before you begin instal- lation. It's common, especially for some remanufactured calipers, to have bleed valves that feature a different hex size. Knowing that you have the correct line wrench(s) handy from the start will save time and aggravation. In some cases, during the remanufac- turing process, correcting damaged bleed valve female threads may have resulted in re-machining to a larger size, which may change the size of the hex (for example, original calipers may have featured bleed valves that require a 10 mm line wrench, but the reman caliper may feature a bleed valve hex size of 5/16-inch, etc.). Check this from the start to avoid the need to travel back and forth to your tool chest. Sliding calipers that ride on smooth-wall guide pins must be inspected for cleanli- ness and smooth engagement of the pins to their bores. If guide pin boots are damaged, this is a clear indication that the pins are The Chassis Extreme-duty emergency vehicles require optimum braking performance and consistent reliability. Whenever servicing any emergency vehicle, such as a police car, don't scrimp on rotors or pads... always use the specifc materials specifed for the application.