When and Why Do I Change The Brake Discs?


To start this post on the brake discs, you should know that they have a vital role in the maintenance of your vehicle so that it is in good condition. Its primary function is to slow the movement of the wheels coupled to the disc so that the brakes work.

Operation of the brake discs

The brakes are taking to the disc, and this system is the one that causes that the friction takes place that slows down the rotation of the wheels so that these they brake, and the vehicle stops more or less. But such friction sufficiently warms the operation of said system and causes over time the effectiveness of braking and the formation of a flange, being a danger to the good maintenance of the vehicle, and consequently, for the safety of the user.

Each vehicle needs a cooling system more or less effective, depending on the weight, size or power of the car. There are two types of brake discs: solid or ventilated. As they lose their thickness, the discs must be replaced. The fact is that the wear of the brake discs can also be produced by the type of driving of the user and the type of roadways carried. This indicates that it is necessary to check such wear before it is too late.

When to change brake discs

It is obliged to change the brake discs when they reach the minimum thickness of wear or if you detect any abnormality in them. You should know that every brake disc has a predefined minimum thickness, under which you have to consider changing it to a new one. To know the limit of wear, you can do it from the descriptive tab of the brake discs. When creating a flange on the brake disc it ‘s hard to measure the remaining thickness, so it is convenient to measure it at three different heights (near the outer flange, in the center, and near the inner edge). To measure the thickness you need a brake caliper pad or caliper.

Read Also: “Does Your Car Shakes When Braking? Causes and Solutions

On the other hand, and as we have previously mentioned, we must also be attentive to any anomalies that may occur, which is why we also have to change the brake discs:
  • Stripes: When you make some stripe on the disc is due to friction of the brake pad without coating the disc. When there is no coating, the metal brake disc bracket attacks the disc, which causes noise when braking.
  • Bending: Overheating of the brake disc causes deformation and the change of color to bluish, which causes a vibration in the steering wheel when braking.
  • Fissures: These appear when the brake disc is very worn.
  • Breakage: This occurs when rust weakens the brake disc.

If you are looking to change the brake discs yourself, and your brake discs are not yet worn, but they collect a lot of dirt, you can use a brake disc cleaner to improve its performance.


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