Updated at: 24-07-2023 - By: micdot

A vehicle’s braking calipers are critical. There’s no limit to what kind of vehicle you can use. However, did you realize that calipers degrade over time? Isn’t that a natural thing to do? With the passage of time, everything loses some of its original potency. Aside from this, it’s not uncommon for the calipers to lose their compression with time, which necessitates an adjustment or replacement.

Compressing the brake caliper is a skill that many people lack. What if you know, but aren’t quite sure? You need not be concerned; I will guide you through the procedure, which is why I wrote this essay. Let’s take a closer look at how a brake caliper works before moving on to the meat of the article.

What Is A Brake Caliper?

Your car’s braking system relies heavily on the calipers, which are a particular component. With its cubical-box structure, the caliper is able to fit the disc rotor and stop your car. For more information about this vehicle’s ability to stop, please refer to the following section.

How Does My Car’s Brake Caliper Work?

If you want to understand how this technique works, you need to know what pieces are involved. The following are the components:

The Wheel and Tire Setup

A Rotor Disc Brake.

Assembled Caliper


Nuts for the wheels

The disc rotor and wheel are held in place by the wheel assembly. Allowing their graceful rotation is thanks in part to the bearings inside. It is the rotor disc that the pads come into contact with. This will slow down the rotation of your wheel by creating enough friction. Because of the friction, the rotor disc creates a lot of heat. In addition, the holes drilled into the disc allow air to dissipate the heat that is generated. Hydraulic power is used to compress the rubber braking pads that are attached to the rotor surface by the caliper’s pedal. As a result, the wheel is slowed down by building up friction. Dust boots, a caliper bracket, slider pins, an inner brake pad, a metallic frame, and a piston are all part of the caliper assembly.

In order for the fluid to reach the piston, the caliper frame has a banjo bolt. The piston is pushed more strongly by the agitated liquid that comes out of the pedal’s side. In addition, the piston can glide along the slider pins to a predetermined range. Learn how this caliper functions now. Applying the brakes transfers pressurized hydraulic fluid from the caliper to the brake cylinder. Inner pad squeezes onto rotor surface as a result of fluid pushing piston. To counteract this force, the brake pad on the other side is squeezed into contact with the rotor disk by the fluid’s inertia, pushing the caliper’s frame and slider pins together.

How To Compress Brake Caliper

How to Compress Rear Brake Caliper Piston - WITH AND WITHOUT SPECIAL TOOLS  - YouTube

With our newfound knowledge about brake calipers, we can go on to the next section of the article. Make sure you read the instructions in order to completely comprehend what you’re doing. In the simplest way imaginable, here’s how to compress a brake caliper. There are a few things you’ll need to complete this. Starting with the caliper, dismantle it or remove it. After that, unscrew the side bolts and use a screwdriver to pry the rest of it out of the way. Remove the caliper, the caliper bracket, the pads, and the rotor from the caliper. Discard the clips as well. Keep the caliper firmly in place. As an alternative, you can use an elastic band, or a coat hanger. It could be destroyed if you leave it dangling from the brake hose.

Remove the caliper by loosening the two 2/13 millimeter bolts. Cleaning the components should be done at the same time. With the caliper removed, use a rubber mallet to remove the rotor. The rotor will come off easily if you apply some lubrication to it if it gets stuck. The rotor might become rusty with time, making it difficult to remove. The next step is to clean the spindle area (where the rotor will be installed). Applying some of the greases before reinstalling the rotor is preferable (you can use anti-seize, but grease works just fine and is not messy at all). Make sure the spindle area is clean before reinstalling the rotor. The rotor can then be attached with a simple push and without the use of any tools. To finish mounting the caliper bracket after installing the rotors, follow these steps:

The caliper bracket should be greased with a brake lubricant so that it can move freely and prevent rust from forming. Put the bolts in while holding the caliper to the rotor. It’s done. With a wrench, you may also tighten it. The fun is about to begin. The caliper must be compressed. You’ll need a pair of channel locks and oil-filtered pliers for this. The piston pressure can be maintained with the use of oil filters. You can utilize the channel locks to spin the piston while the oil filters perform their job. The only thing to remember is to use the pliers to pinch the rubber boot. Put some continuous pressure on the filters and move the caliper piston clockwise, using the channel locks, to get a good seal. In my opinion, I believe that compressing files manually is a lot faster than utilizing software. He has an extra pair of hands to help him if you’ve ever seen someone doing this with the tools.

It’s time to put the kits back together. When installing the pads, don’t forget to lubricate the area where they’ll be placed. Pulsations are prevented by this. Apply silicone on the caliper slides with a brush and silicone. The caliper slides now have plenty of room to move around. Because conventional greases degrade over time, only silicone should be used on the brake slides. After resetting the caliper, you can begin manually inserting the slides to ensure that the threads cross. After that, use a torque wrench to further tighten it. Finally, reinstall the clipper clip and secure it around the bracket with a clamp. And that’s it. An excellent example of this can be seen on YouTube:

How Do I Use A Compressor For Compressing My Caliper?

Compressor kits are expensive, but they come with all the necessary tools and gears to compress your caliper. It also features two different bolts and a range of adapters for various caliper piston types. The first step is to find the correct adaptor for your piston. To prevent it from slipping off when you tighten, make sure it fits correctly into the slots. Now, attach the adaptor to the bolt with the included allen wrench. The adaptor will be held in place by slots in the bolt assembly. To tighten it, insert a piston tool through the plate and attach it to the piston slots. There is nothing left to do but enjoy your new home. Grab the piston tool’s handle and begin rotating it. The piston will be rewound and the caliper compressed as a result.

Why Do I Compress My Brake Caliper?

The appropriate way to compress your brake calipers is now clear to you; do you, however, understand why this is necessary?

Caliper Piston Won't Compress: Common Causes & Solutions

Every time you engage the brakes, various sections of the vehicle are subjected to persistent wear and strain. A consequence of this is that the brake pads wear out more quickly. When you let go of the brake, the brakes now rewind and compress. However, if the brakes are worn out, this will not be possible. As a result, the caliper and piston are free to move about. This grinding noise is caused by the caliper being too close to the rotor disc when it is hanging. A new set of pads and calipers are installed to prevent this from happening.

Are You Having Trouble Compressing Your Caliper Piston?

If your caliper isn’t compressing, you may have one or more of the following issues:

If you haven’t driven your car in a while, your caliper may not work properly. Rust can build up on a vehicle’s parts if it is not used. It’s possible that your caliper piston isn’t compressing because of a problem with the piston moving around the seals.

What Do I Do If My Caliper Is Not Compressing?

Suppose you have a brand-new rotor and brand-new brake pads, but your caliper isn’t working. Why isn’t the caliper compressing even though you have brand new components?

Because your caliper is jammed, you’re seeing this. Two C-type clamps are required to liberate it. To get around this, I’ve come up with a creative strategy of my own. Use a clamp to acquire a regular grip on the area, then use another to hold it down. Using two C-type clamps together will increase the amount of pressure applied to the affected area. You can compress your caliper by turning both clamps together and generating significant pressure in the system as a result of this action. Calipers that are stuck should be compressed in this manner.

Frequently Asked Questions

How Do I Know If I Have A Faulty Brake Caliper?

Here are some symptoms to look for if you think you may have a bad brake caliper: When the caliper seal fails, brake fluid leaks and hydraulic pressure is lost, brake fluid might be found on the wheel. There is a problem with the caliper; it’s stuck and will keep rubbing against the rotor disc. This will make a grating sound. When changing brake pads, a faulty caliper prevents you from compressing the caliper. When the shifter is in the drive position, your vehicle will not move in any direction. Brake pad wear is uneven.

How Much Time Will My Brake Caliper Last?

Brake calipers are known to be extremely long-lasting due to their high level of tensile strength. For at least ten years, you can anticipate it to last, and for about 75,000 to 100,000 miles, these can efficiently serve you.

How Long Do Brake Calipers Last? | YourMechanic Advice


Are you happy with the answers you’ve gotten from our “How To Compress Brake Caliper” guide?Because it is based on extensive study and real-world experience, you may put your faith in this instruction and proceed
with the compression of your caliper. Here, I’ve outlined the steps necessary to compress the caliper. In the absence of a compressor kit, ordinary tools can be used to compress the caliper’s pistons. Pay attention to the instructions I’ve given you in the notes I’ve left. I’ve done my best to go into as much detail as possible about each stage. Avoid rushing the treatment, however. Allow yourself to be patient. Your brake caliper can be damaged by any sudden action. The moment has come for you to get your caliper compressed, and I hope this article was helpful to you.