Knowing some of the signs of a bad constant velocity boot can help you to identify when the boot has failed, which can allow you to replace it or have it replaced before the axle joint fails. The constant velocity, or CV, boot is a cover that goes over each of the joints located on a constant velocity axle. The constant velocity axle is typically used on front wheel drive vehicles, but can also be used on the rear of all wheel drive and rear wheel drive vehicles.
The axle itself is used to transfer power from the transmission or differential to the drive wheels. The axle has a joint on each end that allows the axle to flex and move with the suspension and steering components. It is called a constant velocity joint because the design allows the joint to flex through the use of bearings while maintaining a constant speed. The purpose of the boot itself is to cover the joint. The boot is used to hold a special grease within the joint itself to keep it lubricated.
It also keeps dirt and other contaminates from entering the joint. If the boot fails, then the grease will be allowed to leave the joint causing it to run dry which will ultimately lead to the failure of the bearings inside of the constant velocity joint. Should this occur, the axle assembly would need to be replaced. Prior to lifting the vehicle off of the ground, there are a couple of inspections that can be done to try and diagnose a failing constant velocity boot.
Step 1: Check for grease on your wheel. When looking at your wheels, if there is any grease on them, then that is an indication that there is a CV boot failure. When the outer boot fails, the grease to come out of the joint and while the axle is spinning the grease will typically get thrown on the wheel. Step 2: Check for grease on your fender well. Due to the design of some cars, the CV joint grease cannot make its way onto the wheel itself. Many times it is thrown onto the fender well liner.
Inspect the fender wells for signs of grease which would indicate a possible failing CV boot. Your initial inspection may or may not reveal any signs of a bad constant velocity boot. If nothing is found, then further inspection of the boots needs to be done. At that point, you will need to inspect them from under the vehicle.
Step 1: Park your car. Park your vehicle on a flat, hard surface and apply the parking brake. Step 3: Jack up the car. Working on one side at a time, place the floor jack under the front jacking points and lift the vehicle high enough to where you can easily get underneath it. Step 4: Lower vehicle onto jack stand. Place the jack stand under the jacking point on your vehicle and lower the vehicle onto the jack stand. The boot will need to be replaced , and depending on the condition of the CV joint, it may also need to be replaced.
Please call us directly to schedule an inspection if you notice any of the aforementioned symptoms in your German import. Follow Us on:. What does a drive-axle boot do for your car?
Intense vibration If you notice a rattling noise or vibration coming from what seems like your suspension components, the problem could be related to a contaminated CV joint. Rating Summary. Robert 20 years of experience. Request Robert. Nissan Altima L Great work. Robert was friendly and made it clear what other parts i needed. Originally it was my shifter cable but I found out my steering column was busted.. So now given the knowledge and the resources i can now go about getting that taken care of and I can't thank Robert enough for the insight on the situation.
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