How to Compress Brake Caliper in 2021 – 4 Easy Ways

How to Compress Brake Caliper in 2021 – 4 Easy Ways
It would be great that car enthusiasts know how to compress brake calipers to fix their pads themselves when they need to get them changed .
Suppose you are reading the post to understand how to compress brake calipers. In that case, there are chances that you may be having issues with the compression of brake calipers .
adenine much as one would advise that matters of breaks be handed to professionals, it is evenly essential to know how to compress brake calipers .

A Brief Review of Cars Braking System

But before going into detail about how to compress the brake caliper, let us talk about the car brake system. Our cars are moving metallic that could dash into anything that comes their part without a break.

A car brake system is a series of arrangements designed to convert the fomite ’ s kinetic energy through friction into heat energy to bring the cable car or brake from a top speed safely .
different components are made together to bring about the brake arrangement in vehicles. Each separate has its individual function in the assembly .
They work together to allow us to drive cars safely on our roads, in the cities, when we engage the brake bicycle. There are versatile braking systems, but the organization we are basing our focus on is the hydraulic brake system .
There are eleven substantive brake components in a modern car. The components and their purposes are ;

01. The Brake Pedal

The brake bicycle extension of the brake system allows the operator or driver to control the integral brake system .
They are normally located where it is accessible by foundation. It is operated by just stepping on the pedal as desired .

02. Master Brake Cylinder

The master cylinder acts to push hydraulics through the bracken lines after the pedals are stepped on .
The intemperate we step on the pedals, the stronger the consequence as more fluid is forced through the tube to cause other components to act and bring the car under control .
For some vehicles, it is a single central cylinder that serves fluid blackmail to all wheels. still, in modern cars, the cylinder is divided into two or four-spot for safety reasons .
In that lawsuit, the cylinders act individually and independently when one fails .

03. Brake Disc

The magnetic disk rotates alongside the wheel as the car moves. The aim is to give the brake slog and caliper a grapple coat, creating clash between the brake slog and the magnetic disk .
Causing the motion on the wheels to die away lento .

04. Brake Drum

The bracken drum act about in a like way as the brake phonograph record. however, they have the lapp determination. A car can either possess the phonograph record arrangement or cram system or the most common system combined .
The rear wheels frequently come in the cram in the incorporate system, while the front wheels come with the phonograph record. The brake barrel rotates as the wheels .
alternatively of pads, bracken shoes act to seize motions from the wheels when they expand, pushing against the drum after the brake pedal is stepped on .

05. Brake Pad

Brake pads are used for the disk system, and their aim is to hold tauten the rotating disk when acted upon .

06. Brake Calipers

Brake calipers dissemble by bringing the clamping force, which pushes the brake pad into the disk .

07. Brake Shoe

The brake shoe is barely another version of a brake pad, and its aim is to force motions to seize from the drums .

08. Brake booster

The booster is part of the brake system whose determination is to amplify the imperativeness using a vacuum after the bracken is stepped on. It is besides called a void servomechanical .

09. Brake lines

Brake lines serve the vessels through which the hydraulic fluid is compressed as they travel from the liquid ( hydraulic ) tanks to the wheels, where they cause actions on other components .

10. Wheel Speed Sensor

not all cars come with a accelerate detector, but most advanced cars do. The focal ratio detector is a sensitive device that feeds data of the speed at which the vehicle moves to a calculator .

11. ABS Module

ABS stands for Anti-Braking System. The ABS module is a calculator that receives data from rush sensors .
It acts according to the manufacturer ’ sulfur instructions causing the car to be brought under safe command promptly than the drive would initiate .
only a few vehicles come with these components, particularly in advanced vehicles .

How does the Brake Caliper Piston Work?

A piston is like an arm whose actions force another part or part to react. The brake caliper piston is an essential character of the brake system .
When a driver steps on the brake pedal, it forces hydraulics out from the master cylinder through the brake lines. atmospheric pressure builds up in the bar, which pushes against the caliper pistons .
This then forces the brake calipers to move the brake pad between the phonograph record causing it to slow its gesticulate by friction .

Reasons why B

rake Caliper Piston Won’t Compress

A brake caliper may not compress for some number of reasons, and some of the most coarse issues or reasons they may not compress are ;

01. corrosion

when vehicles are made to remain inactive for a long time, corrode due to the hydraulic meaning cursorily develops on the caliper, and this will cause it not to compress .

02. Deformed piston

due to the changeless application of breaks, the piston seals are gradually deformed. This will go on until the piston fails to appropriately fit the seal, causing the piston to get stuck .
This leads to partial derivative compression and causes the brake caliper not to compress.

03. wear and Tear

this is a most common trouble with mechanical components generally .
Caliper bolts dwell of the slide, which requires lubrication always, and the fictile boots give to assist in this lubrication .
Changing brake pads get them to wear and causing the brake caliper piston not to compress .

How to Compress Brake Caliper in Easy Way

Before seeing how to brake, You can compress calipers, and there is a motivation to understand why we have to compress them in the first gear place .
ascribable to wear and tear, our brake pad gets visibly thin as they undergo constant friction when the brakes are applied .
unfortunately, while this wear of the brake diggings is happening, it leaves the bracken caliper hanging out with the piston, causing the brake pads to close in on the disk ( rotor ) by a few inches .
This will go on if they are not replaced until they start touching the phonograph record. If we must prevent this, new pads are put in station of the wear out ones .
Replacing brake pads can be technical and requires some compression push to put the caliper back into position after replacing a embroider .
The compression is done by lento pushing the pistons in the caliper back into their house. Before compaction, it is necessary to determine the best compression method and tools to use that will cause minor wrong or injury .
You can compress brake calipers in different ways. They can be compressed using a c-clamp, channel locks, and caliper piston compression tools .
But there are things you must do before you start to compress, and they are ;

  • Remove the lid on the hydraulic reservoir to reduce the excessive pressure that will build up when compressing the calipers.
  • Have your bleeder valve open.
  • Place a source pan beneath to collect the fluid.

now, having done the above, let ’ s see how to use these compression methods ;

01. How to Compress Brake Caliper with C-Clamp

This method acting on how to compress bracken calipers include ;

  • Place the c-clamp at a firm position over the caliper and make the end push against the piston. Place the c-clamp over the brake caliper. Let the brake pad in front of the piston and in-between the jaws of the clap.
  • Turn the screw gently as you adjust: – wind down the screw on the clamp and make it close to clapping on the brake pad and the caliper.
  • Place a wood block between the clamp and the piston: – the clamp jaws may dent a hole into the brake pad, and to avoid this, place a wood block between and tight the clamp hard.
  • Screw on the clamp: – Screw or tighten the clamp as they compress, pulling inward the piston.
  • Adjust until it is just right to fit the new brake pads onto the caliper:- keep tightening the clamp until the piston adjusts rightly for the new brake pad to sit in.

02. How to Compress Brake Caliper Using Channel Locks

This method acting is exchangeable to the c- clamp method, only that the tools are operated differently. now, let ’ s see how to compress brake calipers using this method .

  • Take the caliper off; get the caliper un-tightened, and pull out the bolt.
  • Place the brake pad next to the piston; place the brake pad in front of the piston and make it fit just well and adjust the channel, then place channel lock to a position.
  • Place your channel locks; put it such that one end of the grip is behind the caliper and the other behind the brake pad, or place such that the caliper and brake pad are placed between the grips.
  • Squeeze the channel locks and squeeze the piston back in:- now, slowly but gently compress the piston by squeezing hard on the channel lock until the piston is successfully retracted inward.

03. How to Compress Brake Caliper with Caliper Piston Compressor Tool

This method on how to compress brake calipers include ;

  • Take the caliper off; as usual, pull the caliper off from its bolts.
  • Place brake pad in front of piston: – place brake pad in front brake caliper and the brake piston.
  • Place the caliper compressor inside the caliper: – make sure the caliper compressor is adjusted and the push bar is not hanging out already. Then place the caliper compressor on the side of the caliper, just in front of the brake pad.
  • Pump down the compressor tool and have your brake pad in position; now pump while the push bar pulls out to push against the brake pad and cause the brake pad to go against the piston as it retracts.

This ways of compressing brake calipers will make batch of room for the new brake embroider to fit in .
How to Compress Brake Caliper in 2021 – 4 Easy Ways How to Compress Brake Caliper in 2021 – 4 Easy Ways How to Compress Brake Caliper in 2021 – 4 Easy Ways

04. How to Push Back Brake Piston Without Tool

This method on how to compress bracken calipers include ;

  • Place a regular screwdriver in the caliper window: – When you place the screwdriver/bar in the brake caliper window, hold firm as you move inward between the openings. Dip the screwdriver to a length where you have an equal balance in the force to pull. And this will cause the brake piston to pull back slightly.
  • Pull outwards; after the screwdriver is in, pull moderately but firmly against the brake pad outwardly.
  • Place the screwdriver between the brake pad and piston; now, place your screwdriver between your brake pad and brake caliper and find the piston using your screwdriver.
  • Push the piston back; having found the piston head, gently but firmly push the piston back in all the way.

significant notes

Every method acting may have its pros and cons, but some ways offer the best consequence with room for little or no damage at all .

  • When using a screwdriver, it places unequal forces on the piston during compression, and that can cause the caliper piston to get stuck after compression.
    Also, suppose the caliper piston is made of phenolic material. In that case, the method of using a screwdriver or other bar to ply on it could get it damaged.
  • Use methods that provide equal pressure against the pad as you make compression against the piston.
  • Do not attempt to use the compression methods above on pads equipped with electric sensors.
  • When compressing, make sure you have the bleeder valve opened to drain out the old brake fluid. Place a source pan to collect the drains.
    Be sure to keep the bleeder valve in an upward direction and don’t turn over the caliper. In contrast, the bleeder valve is open, as doing this can let a gush of air into the brake system and cause the brake not to function correctly.
  • Use old brake pads when compressing pistons to avoid damages on the new pads. Otherwise, it may cost you more having to replace another pad.
    Suppose you choose to use the new one during compression. In that case, you may risk improper fittings of the pad even if damages may not be visible. This may cause improper functioning of the brakes.
  • After the release of the valve before compression, you will notice a collapse on the brake pedal. Therefore, after the compression and fitting the calipers to position, you have to get the pedals hard again.
    You can get them hard with a continuous pumping down on the pedals. Doing this will send the piston back out to push against the pads. If not, your brakes will not function properly and may fail when the car requires an adequate grip to hold back from the collision.


01. Always release the hemophiliac valves
02. Use old brake pads when compressing pistons
03. Pump on the pedals after compaction fixation
04. alone compress when your brake pads and calipers have not electric sensors


01. Do not tilt the caliper when valves are open
02. Do not compress using new brake pads
03. Please do not use the brakes until they are hard and you ’ re satisfied the piston has out pushed the pads to the magnetic disk ( rotor )
04. Please do not compress while there electric sensors .

faq about Braking System

01. Why do my brakes squeak ?

Your brake squeaks for different reasons. It could be a consequence of moisture or debris on the disk ( rotor ) .
It can be caused by brake pads that have worn besides low or badly disk ( rotor ) and a host of other causes. then, you have to find out what the reason could be for yours .

02. Can my brakes function without fluid ?

well, not all kinds of brakes require fluid, but for a hydraulic brake system, fluid is decidedly needed for compression, and your brake won ’ deoxythymidine monophosphate serve without the fluid .

03. Why does my brake feel soft ?

several issues can cause the pedals to feel soft. It could be from a broken level of fluid in the fluid cooler or a leakage/breakage along the break lineage and even as a solution of air out in the brake telephone line .

04. Why do I feel some vibration on my brakes when stopping ?

heave rotors frequently cause vibrations .

05. How much can one change brake pads ?

It varies for different individuals, the environment/terrain on which the car is used, and the timbre of the brake pad. ideally, you are to change the pad every 50,000 miles .


With all being said, I believe we have given helpful information about the brake system in your car .
Friction generates an incredible total of heat which could damage parts of the brake system .
If we must overcome this challenge, components immediately involved in frictions are made with singular parts and designed to help dissipate heat promptly.

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Category : Car Brakes