Nope. The bearing is a totally separate sealed assembly. The boot covers the CV joint. It has the ribs to squeeze the grease back into the rollers with every revolution, and to keep dirt and water out. A torn boot can be replaced, but it has to be done before damage occurs to the joint. Your mechanic will clean the old grease out and install new grease that comes as part of the kit.
Be aware that rebuilt half shafts today are uncommonly inexpensive so it no longer makes economic sense to replace a torn boot. A rebuilt half shaft can cost less than $100.00 and it takes about an hour to replace. A replacement boot can cost $30.00 and takes an hour to clean the joint and replace the boot, in addition you need to partially remove the shaft. By replacing the whole shaft, you will pay more for parts, less for labor, and have a better repair.
If there is still grease being flung from the CV joint, the joint has not had time yet to wear to the point it causes noise. When it does, in perhaps a year or more, you will hear a clicking sound when turning and mostly when backing up. CV joints never make a grinding noise. To be chewing up a caliper bracket suggests something else is wrong like the bearing assembly is coming apart. It is held together by the large nut on the end of the CV joint. That nut must be tightened to a very specific torque spec which is very high. Most cars call for around 180 foot-pounds, but some GM cars call for as much as 240 foot-pounds. A wheel bearing will become noisy when any vehicle weight is placed on it while that nut is not fully tightened. The noise will sound like the buzz of an airplane engine.
Monday, June 20th, 2016 AT 7:20 PM