How to Use a CV Boot Clamp Tool Step by Step

Start by identifying your clamp type

The right method depends on the clamp on your boot. A tool made for one style can leave another style loose, and a loose clamp lets grease out and dirt in. Look at the old clamp before you buy or borrow anything.

If you are still choosing a tool, our best CV boot clamp tool comparison lists which clamp types each tool supports, so you can match it to your boot.

Before you start: gear and safety

Lifting a car and handling old grease are the risky parts of this job. Treat them seriously before you pick up the clamp tool.

Never work under a car held only by a jack. Use jack stands on firm, level ground, chock the wheels that stay on the ground, and do not rely on the jack alone. Wear safety glasses, because springy clamps and old metal bands can snap or fly off. Gloves help, since cut strap ends and torn clamps are sharp.

• Jack stands and a jack rated for your vehicle
• Safety glasses and work gloves
• Your clamp tool and the correct new clamps
• Fresh CV boot grease and clean rags
• A torque wrench or 1/2-inch extension, if your tool accepts one

Step 1: Prepare the boot and joint

A clamp can only seal a boot that is seated correctly, so the prep matters as much as the tightening. Work through these steps in order.

Once the old boot is off, wipe away old grease and inspect the joint. If it feels gritty or clicks, the joint may need replacing rather than just a new boot.

• Raise the car, support it on jack stands, and remove the wheel.
• Remove the axle or access the joint as your vehicle requires.
• Cut or open the old clamps and slide the old boot off.
• Clean the shaft and joint, then pack in fresh CV grease.
• Slide the new boot on, and seat each end in its groove on the shaft and joint housing.
• Let a little air out of the boot so it sits in its natural shape, without a pinched fold.

Step 2: Use ear or crimp-band pliers

Ear clamps and crimp bands are the most common style on replacement kits. Slide the clamp over the boot end so it sits directly over the groove. The ear or crimp section should face a spot where you can reach it with the tool.

Place the pliers jaws over the ear or crimp, then squeeze slowly and steadily. Squeezing a little at a time lets the clamp pull evenly around the boot. Stop when the ear is fully closed. For a double ear clamp, make sure both ears close.

With crimp bands, the process has one more step. Crimp the band first, then push down on the crimp to lock it into place. Some pliers, such as the Alpha Rider F00N1887-AR in our data, are listed as compatible with a torque wrench or a 1/2-inch extension handle, which gives you more control on a tight clamp.

Larger ear-type tools also exist. The BOSRUIDA HD-028 is listed for single and double ear hose clamps and has a torque wrench style lever, which suits bigger jobs where hand pressure alone feels awkward.

Step 3: Use a band clamp tool

Band or strap clamps work differently. A toothed strap loops around the boot, and the tool pulls it tight rather than squeezing it shut.

Thread the strap through its buckle around the boot groove, then feed the free end into the tool. Turn or pull the tool handle to tighten, and the teeth hold the strap at each pull. When the strap is snug and the boot does not rotate by hand, lock it and cut off the tail with the tool's cutter.

The Alpha Rider 21-piece kit in our data pairs a banding tool with built-in cutters and winders with 10 small and 10 large stainless steel clamps. Per its listing, cutting excess strap needs the banding tool, so keep side cutters out of the plan.

Fold or press down any sharp strap end so it cannot snag a glove or a rubber part later.

Step 4: Use Clic-R style pliers

Clic-R clamps are low-profile metal clamps that close with one squeeze. Position the clamp on the boot groove, set the pliers across the closing section, and squeeze until the clamp locks.

Kits such as the Wokape in our data include 8 Clic-R style clamps, 4 small and 4 large, with pliers. That is enough for one axle boot pair with spares for a second attempt. Keep the clamp square to the boot as you close it so it does not twist.

Step 5: Check your work

After every clamp is closed, grab each boot end and try to twist it by hand. It should not slip on the shaft or housing. Look for even compression all the way around and no gaps between the clamp and the boot.

Wipe away any stray grease, reinstall the axle, refit the wheel, and tighten the lug nuts to your vehicle's specification. After a short drive, look under the car for fresh grease near the boot. Any sign of grease means a clamp is not seated and needs to be replaced and redone.

Do not reuse an old clamp that has been opened or bent. A fresh clamp is the cheapest part of the job to replace, and the one most tied to a good seal.

Frequently asked questions

Can I use regular pliers instead of a CV boot clamp tool?

It is not a good idea. Regular pliers tend to crush the clamp unevenly or fail to lock it, which can leave a gap for grease to escape. A matching clamp tool closes it evenly.

Do I need a different tool for inner and outer boots?

Usually the clamp type matters more than the boot position. Inner and outer boots often use a small and a large clamp, so check that your kit includes both sizes.

Can the same tool work on other hose clamps?

Some can. The listings for several tools in our data mention fuel filter, cooling hose or water pump hose clamps. Check the listed clamp type first, though.

How do I know the clamp is tight enough?

The boot should not turn or slide on the shaft when you twist it by hand, and the clamp should look evenly closed. Fresh grease around the boot after a drive means it still leaks.