Lexus 04438-08080 Boot Kit, Front Drive Shaft, In & Outboard

For disassembly, start by mounting the driveaxle in a vise with wood-lined jaws to prevent damage. Check the CV joint for play and smooth operation throughout its range of motion. If a boot is torn, carefully pry up the clamps' retaining tabs to loosen them and slide them off. Pry up the edge of the outer boot and push it away from the CV joint, then pull the inner CV joint boot back from the housing and slide the housing off the tripod. Mark the tripod and axleshaft for reassembly. Remove the tripod joint snap-ring, and using a hammer and brass punch, drive the tripod joint from the driveaxle. Cut off or remove both boots if necessary. Clean all components and inspect for wear. For reassembly, wrap the splines on the inner end of the axleshaft with tape to protect the boots, then slide the clamps and boot(s) onto the shaft. Place the tripod on the shaft, apply grease to the assembly and housing, insert the tripod, and pack grease around it. Slide the boot into place, adjust the driveaxle length, equalize boot pressure, and tighten the clamps. Finally, install the driveaxle assembly.

They prevent dirt, water, and foreign material from damaging the constant velocity (CV) joints.