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The wear limit of the brake disc is 2 mm. After the limit is reached, it is necessary to replace the new brake disc.However, in actual use, most car owners have not strictly implemented this specification.In fact, how often (how many kilometers) do the brake discs change? The frequency of change should be measured based on personal driving habits. The general measurement criteria are as follows：

1. Look at the replacement frequency of brake pads

If the replacement frequency of brake pads is very high, it is necessary to check the thickness of the brake discs more, because the use of brake pads and the use of brake discs are relatively worn, so check the brake discs regularly.

2. Determine based on wear and tear conditions

Since in addition to normal wear and tear of the brake discs, there are also wear and tear due to the quality of the brake pads or brake discs and the formation of foreign objects during normal use, if the brake hub is worn by foreign objects, there are some deep grooves, or the disc surface is worn with errors (some are locally thin, some are locally thick), then it is recommended to replace it. Due to this kind of wear, the error will directly affect our driving safety.

3. The owner can also consider replacing it according to certain rules.

For example: every time the brake pads are replaced twice, the brake discs are replaced once.

4. The life of the brake disc is determined based on the quality of the brake disc itself and the owner's personal driving habits. In most cases, the service life of the brake disc should be more than 100,000 kilometers.

5. Check the wear of the brake discs, depending on the condition

Check whether there is a deep groove of more than 1 mm on the brake disc, check whether the thickness of both sides of the brake disc is the same, and whether the brake disc is uneven or cracked.If the above problems occur, the brake discs need to be replaced immediately.

How to maintain the brake disc

1. Pay attention to protecting the brake discs when washing the car

When preparing to wash the car, it is recommended to dry the car aside to cool down naturally before washing and maintaining the car.Generally speaking, a material as hard as a brake disc, how can a car wash hurt the brake disc?In fact, in our daily brake use, the brake disc will generate a lot of heat due to the friction of the vehicle deceleration, and the temperature will be very high.If the car is washed at this time and the brake disc has not had time to cool down, the cold water will be sprayed on the brake disc. The thermal expansion and contraction will distort the steel brake disc, and cracks will appear in serious cases.

2. Minimize the loss of brake discs

Although the loss of brake discs is slower than that of brake pads, technicians in general car shops will only prompt for the replacement of brake pads and brake oil, but the brake discs will wear out after a certain mileage (participation, pictures, inquiry), and the surface of the brake discs is uneven or the thickness of the brake discs does not meet the standards, which will seriously affect brake performance in the long run.

3. Avoid abnormal brake noise

Competitive-level brake pads are suitable for long-term extreme high temperature conditions. Because of different material formulas and different use conditions, it is normal for “hissing” to occur.However, it is important to pay attention to the abnormal brake response of “hissing” in general civilian vehicles.Car owners should usually pay attention to cleaning the brake pads and brake discs to reduce the entry of foreign objects into the brake system, and replace qualified brake pads.

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