How Long Will 4mm Brake Pads Last? [Answered]

Brake pads are essential components that facilitate good braking. Therefore, it is important that they are in good shape and have the required minimum thickness. To prevent any damage to your car, it would be best to familiarize yourself with the tell-tale signs of wearing out brake pads. 

Generally, 4mm brake pads are likely to last up to 50,000 miles. However, the wearing out of the brake pads depends on several factors such as the individual, how he drives, and how often he applies the brakes while traveling on average. Newer brake pads are likely to last longer than used ones. 

This article highlights the maximum required thickness for brake pads to function properly as well as the risk involved if they are below the requirement. 

How Long Will 4mm Brake Pads Last?

how long will 4mm brake pads last

Usually, brake pads are worn out if the brake drum or shoe is below 10% full or when the brake pad material is no longer visible. There are usually signs and sounds that indicate wearing out of your braking pads. You might also be wondering how long will your 4mm brake pads last, among other related questions. 

While wearing out of the brake pads depends on the individual, 4mm brake pads can last up to 50,000miles. Newer brake pads are likely to last longer than used ones. However, these may be more expensive in the long run and not as safe due to uneven braking. 

It is important to keep in mind that brake pads play a vital role in the braking system. Consequently, it is important that you maintain them and check their thickness from time to time. Ignoring issues with the brake pads can result in catastrophic failure. That is something you can avoid by taking your car to be checked regularly by a mechanic to ensure they are not worn out beyond the requirement. 

Should I Replace Brakes at 4mm?

For safety purposes, it is vital that you follow the manufacturer’s guidelines on brakes to the letter. It is recommended to have them replaced when they are at 4mm.

Generally, 4mm may be seen as a critical thickness when it comes to brake pad linings. Beyond that, they will not be able to work fine nor last long—these pose a serious concern. It becomes a safety concern and thus, it is important that you have them checked regularly. But first, it would be best to understand how the brake operates. 

The brake pads usually feature a spring on the inside that works to apply pressure on the brake to stop the car. The pressure exerted by the spring pushes a disc, which is pressed against the wheel. It is the friction that is created between the disc and wheel that causes the car to slow down or stop. 

However, if the lining on the brake pad is worn out, there is less friction created, and hence less force is applied to the disc. When this happens, an accident is very likely since there will be no proper resistance from the brakes to stop or slow the vehicle. Therefore, if the pads are less than 4mm, the rotors can be badly damaged and your vehicle’s performance adversely affected. 

How Many mm Should Brake Pads Be Replaced? 

Anything below 4mm poses a serious safety threat to yourself and your passengers as well as irreparable damage to your car. It would be best to replace them at 4mm so as to avoid catastrophic situations. The wear limit of the brake pads is 1/8 inches (3.175mm) below which they cannot function properly and may even cause damage or failure. 

Also Read: How Long Will 3mm Brake Pads Last

Do 4mm Brake Pads Need Replacing?

4mm pads do not need replacing—it is however the minimum thickness that the brake pads should have to ensure proper functioning. It would be best to have them replaced before they go below 4mm. There are several simple tests that you can perform to check their thickness, that is, besides taking your car to the mechanic. 

How Thin Is Too Thin for Brakes?

The braking system of your automobile is an important component. Therefore, it is vital that they are functioning properly for everyone’s safety. For that to happen, they should not go any thinner than ¼ inches. The thickness of the brake pads plays a vital role in road safety. If they measure 1/8 inches in thickness, then they have reached their wear limit. Therefore, anything below 4mm is too thin for brakes. 


There are many different brake pads categorized according to the material they are made of. These include non-metallic/organic, semi-metallic, fully-metallic, and ceramic-metallic. The non-metallic type is made of synthetic substances that are bonded together and are commonly fitted in standard road cars. The semi-metallic pads are made of a mixture of synthetic substances and metal compounds while the ceramic-metallic are made of a dense ceramic material and copper strands. 

The amount of time that it takes to wear out the brake pads can be determined by a number of factors. For one, your driving habits will contribute significantly. This includes how often and how aggressively you apply the brakes. Moreover, the material that the brake pad lining is made of is a major determinant. Softer materials such as organics are likely to wear out faster. 

Typically, when the brake pads rub against the discs, it wears down the friction material. Therefore, when it comes to measuring the thickness of the brake pad lining, we measure the thickness of this friction material. If the material is too thin, it affects how quickly you can slow down your vehicle. If the material is completely dissipated, the brakes will fail completely. 

Final Thoughts

Needless to say, brake pads play a vital role in the braking system of any automobile. Regular maintenance will eliminate certain risks and costly repairs. It is important to keep checking them to ensure they do not go below the required minimum thickness.

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