Dust shields help protect brake components from the environment and minimize the effect of brake fade while driving through water. If removed, dust shields always should be installed back on the vehicle's wheel-ends and they should be examined for tightness, corrosion or distortion. Brake shoe rollers ride on the S-cam and t ransfer the force from the cam head to the shoe. Flat spots on the roller will interrupt that movement and can cause a sliding motion that can damage the cam head. Parts manufacturers recommend that the rollers be replaced with every brake job, you should replace any rollers that show any wear or flat spots.
Oversized rollers are available to prevent cam-over if drum is oversize in diameter.
Many manufacturers provide rollers in a series of sizes. The anchor pins secure the shoes on the spider and allow them to pivot during an application. You should visually check the anchor pins for roundness or wear once the brakes are disassembled. Worn pins or a loose fit in the spider will cause uneven brake shoe wear. Stainless steel anchor pin bushings will be found on some spiders and should be replaced if they show signs of wear.